{ "count": 55, "next": null, "previous": null, "results": [ { "id": 5474, "url": "https://svs.gsfc.nasa.gov/5474/", "result_type": "Visualization", "release_date": "2025-01-20T00:00:00-05:00", "title": "Science On a Sphere: 4 Years of Biosphere", "description": "Biosphere data processed for display on Science On a Sphere (SOS)", "hits": 82 }, { "id": 31239, "url": "https://svs.gsfc.nasa.gov/31239/", "result_type": "Hyperwall Visual", "release_date": "2023-08-29T00:00:00-04:00", "title": "MODIS and VIIRS images of Northeastern US", "description": "Smoke from fires in Alberta/Northern Canada is blown down over the Midwest and Northeastern United States. Terra MODIS 20230801 1600. || terra_modis_true_color_20230801_1600_print.jpg (1024x576) [229.4 KB] || terra_modis_true_color_20230801_1600.png (3840x2160) [11.6 MB] || terra_modis_true_color_20230801_1600_searchweb.png (320x180) [111.8 KB] || terra_modis_true_color_20230801_1600_thm.png (80x40) [7.5 KB] || terra_modis_true_color_20230801_1600.hwshow [121 bytes] || ", "hits": 36 }, { "id": 5075, "url": "https://svs.gsfc.nasa.gov/5075/", "result_type": "Visualization", "release_date": "2023-02-13T00:00:00-05:00", "title": "Near Real-Time Global Biosphere", "description": "The latest 2.5 years of Biosphere data with date annotations. || nrtbio_print.jpg (1024x512) [205.4 KB] || nrtbio_searchweb.png (320x160) [88.7 KB] || nrtbio_thm.png (80x40) [7.2 KB] || Plate_Carree_with_Dates (4096x2048) [0 Item(s)] || nrtbio_annot_plate_2048p30.mp4 (4096x2048) [113.2 MB] || slide-01.hwshow ||", "hits": 66 }, { "id": 5006, "url": "https://svs.gsfc.nasa.gov/5006/", "result_type": "Visualization", "release_date": "2022-11-06T00:00:00-04:00", "title": "Global Biosphere March 2017 - Feb 2022", "description": "Example composite of 5 years of Mollweide projected data of Earth's biosphere beginning March 2017 through February 2022. || newbio_v34_mollweide_comp1130_print.jpg (1024x512) [186.1 KB] || newbio_v34_mollweide_comp1130_searchweb.png (180x320) [94.2 KB] || newbio_v34_mollweide_comp1130_thm.png (80x40) [7.4 KB] || Example_Composite (2000x1000) [0 Item(s)] || newbio_v34_mollweide_comp_1000p30.mp4 (2000x1000) [40.4 MB] || newbio_v34_mollweide_comp_1000p30.webm (2000x1000) [4.5 MB] || ", "hits": 60 }, { "id": 4995, "url": "https://svs.gsfc.nasa.gov/4995/", "result_type": "Visualization", "release_date": "2022-04-22T00:00:00-04:00", "title": "Global Snow Cover and Sea Ice Cycle at Both Poles", "description": "Visualization showing the changes in snow cover and sea ice with the seasons, for the years 2019-2021. || sea_ice_sidexside.0001_print.jpg (1024x576) [121.9 KB] || sea_ice_sidexside.0001_searchweb.png (180x320) [64.0 KB] || sea_ice_sidexside.0001_thm.png (80x40) [6.5 KB] || sea_ice_sidexside.0001_web.png (320x180) [64.0 KB] || sea_ice_sidexside_1080p30.mp4 (1920x1080) [25.6 MB] || sea_ice_sidexside_1080p30.webm (1920x1080) [7.1 MB] || full_video (3840x2160) [0 Item(s)] || sea_ice_sidexside_2160p30.mp4 (3840x2160) [65.8 MB] || ", "hits": 246 }, { "id": 4813, "url": "https://svs.gsfc.nasa.gov/4813/", "result_type": "Visualization", "release_date": "2020-04-21T00:00:00-04:00", "title": "Earth Day 2020: Biosphere", "description": "Global Biosphere data from 1997 through 2017 with corresponding colorbars and date stamp.This video is also available on our YouTube channel. || earthday_bio_comp.0000_print.jpg (1024x576) [95.0 KB] || earthday_bio_comp.0000_searchweb.png (320x180) [51.5 KB] || earthday_bio_comp.0000_thm.png (80x40) [5.0 KB] || earthday_biosphere_composite (1920x1080) [0 Item(s)] || earthday_bio_comp_1080p30.webm (1920x1080) [17.9 MB] || earthday_bio_comp_1080p30.mp4 (1920x1080) [106.0 MB] || captions_silent.29351.en_US.srt [43 bytes] || earthday_bio_comp_1080p30.mp4.hwshow [191 bytes] || ", "hits": 64 }, { "id": 13472, "url": "https://svs.gsfc.nasa.gov/13472/", "result_type": "Produced Video", "release_date": "2019-12-09T14:00:00-05:00", "title": "Operation IceBridge - Northern Greenland", "description": "4K B-roll of snowy northern Greenland landscape filmed during the 2016 Arctic campaign. NOTE: The audio on this clip varies widely and includes loud aircraft noise. We advise turning down/off sound when previewing this item. || 13472_Panasonic_2016_Airborne_LandIce_4K.mov.00_02_19_19.Still001_print.jpg (1024x576) [262.7 KB] || 13472_Panasonic_2016_Airborne_LandIce_4K.mov.00_02_19_19.Still001.jpg (3840x2160) [2.4 MB] || 13472_Panasonic_2016_Airborne_LandIce_4K.mov.00_02_19_19.Still001_searchweb.png (320x180) [100.7 KB] || 13472_Panasonic_2016_Airborne_LandIce_4K.mov.00_02_19_19.Still001_web.png (320x180) [100.7 KB] || 13472_Panasonic_2016_Airborne_LandIce_4K.mov.00_02_19_19.Still001_thm.png (80x40) [6.4 KB] || 13472_Panasonic_2016_Airborne_LandIce_4K.webm (960x540) [103.8 MB] || YOUTUBE_1080_13472_Panasonic_2016_Airborne_LandIce_4K_youtube_1080.mp4 (1920x1080) [367.2 MB] || 13472_Panasonic_2016_Airborne_LandIce_4K.mov (3840x2160) [20.8 GB] || ", "hits": 29 }, { "id": 13554, "url": "https://svs.gsfc.nasa.gov/13554/", "result_type": "Produced Video", "release_date": "2018-12-19T00:00:00-05:00", "title": "NASA Explorers | Season One: Cryosphere", "description": "Music: Very Fast Swing by Claude Salmieri and Fabien Colella Complete transcript available. || CRYO_Trailer_Thumbnail.png (1920x1080) [926.9 KB] || CRYO_Trailer_Thumbnail_print.jpg (1024x576) [57.5 KB] || CRYO_Trailer_Thumbnail_searchweb.png (320x180) [65.6 KB] || CRYO_Trailer_Thumbnail_thm.png (80x40) [6.0 KB] || Cryo_ShowTeaser.mp4 (1920x1080) [46.5 MB] || Cryo_ShowTeaser.webm (1920x1080) [5.0 MB] || CryoTeaser_FINAL.en_US.srt [966 bytes] || CryoTeaser_FINAL.en_US.vtt [979 bytes] || ", "hits": 68 }, { "id": 13117, "url": "https://svs.gsfc.nasa.gov/13117/", "result_type": "Produced Video", "release_date": "2018-12-13T11:00:00-05:00", "title": "Snow over Antarctica Buffered Sea Level Rise during Last Century", "description": "Music: Life Defrosts by Richard Andrew CanavanComplete transcript available. || AntarcticSnowfall_Thumbnail.png (1920x1080) [1.4 MB] || AntarcticSnowfall_Thumbnail_print.jpg (1024x576) [56.6 KB] || AntarcticSnowfall_Thumbnail_searchweb.png (320x180) [61.1 KB] || AntarcticSnowfall_Thumbnail_thm.png (80x40) [5.8 KB] || AntarcticSnowfall.mp4 (1920x1080) [81.7 MB] || AntarcticSnowfall.webm (1920x1080) [10.0 MB] || AntarcticSnowfall_Captions.en_US.srt [1.7 KB] || AntarcticSnowfall_Captions.en_US.vtt [1.7 KB] || AntarcticSnowfall.mov (1920x1080) [2.0 GB] || ", "hits": 63 }, { "id": 4690, "url": "https://svs.gsfc.nasa.gov/4690/", "result_type": "Visualization", "release_date": "2018-10-31T00:00:00-04:00", "title": "Tracking Snow Water Equivalent in the Tuolumne Basin", "description": "This visualization focuses on the Tuolumne Basin, located within the boundaries of Yosemite National Park, which supplies water via the Hetch Hetchy aqueduct to the San Francisco Bay Area. Snow Water Equivalent (SWE) data collected by the Airborne Snow Observatory (ASO) between 2014 and 2017 is depicted in blues and whites, showing how the snowpack changes over time. This version includes a colorbar. || aso_wColorbar_1500_print.jpg (1024x576) [175.2 KB] || aso_wColorbar_1500_searchweb.png (320x180) [127.9 KB] || aso_wColorbar_1500_thm.png (80x40) [8.0 KB] || aso_tuolumne_wColorbar (1920x1080) [0 Item(s)] || aso_wColorbar_1080p30.mp4 (1920x1080) [60.8 MB] || aso_wColorbar_1080p30.webm (1920x1080) [7.6 MB] || aso_wColorbar_1080p30.mp4.hwshow [187 bytes] || ", "hits": 44 }, { "id": 12906, "url": "https://svs.gsfc.nasa.gov/12906/", "result_type": "Produced Video", "release_date": "2018-03-26T15:00:00-04:00", "title": "Two New Satellites Set to Study One of Earth's Most Critically Changing Regions", "description": "In 2018, NASA will intensify its focus on one of the most critical but remote parts of our changing planet with the launch of two new satellite missions and an array of airborne campaigns. GRACE-FO and ICESat-2 will use radically different techniques to observe how the massive ice sheets of Greenland and Antarctica are changing over time and how much they are contributing to sea level rise. The space agency is launching these missions at a time when decades of observations from the ground, air, and space have revealed signs of change in Earth's ice sheets, sea ice, glaciers, snow cover, and permafrost. Collectively, scientists call these frozen regions of our planet the \"cryosphere.\" || ", "hits": 29 }, { "id": 4597, "url": "https://svs.gsfc.nasa.gov/4597/", "result_type": "Visualization", "release_date": "2017-11-16T15:00:00-05:00", "title": "Earth: Our Living Planet (Updated)", "description": "Twenty years of global biosphere data mapped on a slowly spinning globe. || slow_spin_4k.5542_print.jpg (1024x576) [83.1 KB] || slow_spin_4k.5542_searchweb.png (320x180) [48.3 KB] || slow_spin_4k.5542_thm.png (80x40) [4.4 KB] || 1920x1080_16x9_30p (1920x1080) [0 Item(s)] || slow_spin_1080p30.webm (1920x1080) [17.8 MB] || slow_spin_1080p30.mp4 (1920x1080) [119.2 MB] || 3840x2160_16x9_30p (3840x2160) [0 Item(s)] || slow_spin_4k.mp4 (3840x2160) [397.0 MB] || ", "hits": 80 }, { "id": 4596, "url": "https://svs.gsfc.nasa.gov/4596/", "result_type": "Visualization", "release_date": "2017-11-14T17:00:00-05:00", "title": "20 Years of Global Biosphere (updated)", "description": "This Mollweide projected data visualization shows 20 years of Earth's biosphere starting in September 1997 going through September 2017. Data for this visualization was collected from multiple satellites over the past twenty years. || biosphere7_mollweide.4507_print.jpg (576x1024) [192.2 KB] || biosphere7_mollweide.4507_searchweb.png (180x320) [91.0 KB] || biosphere7_mollweide.4507_thm.png (80x40) [7.4 KB] || mollweide_annotated (1920x1080) [0 Item(s)] || biosphere7_mollweide_1080p30.webm (1920x1080) [17.8 MB] || biosphere7_mollweide_1080p30.mp4 (1920x1080) [264.8 MB] || biosphere7_mollweide_1080p30.mp4.hwshow || ", "hits": 113 }, { "id": 12549, "url": "https://svs.gsfc.nasa.gov/12549/", "result_type": "Produced Video", "release_date": "2017-03-24T13:00:00-04:00", "title": "How a NASA Science Flight is No Ordinary Journey", "description": "A group of scientists and pilots conducted a series of science flights over Western Colorado for a new five-year NASA-led airborne mission called SnowEx.SnowEx is exploring better ways to measuring how much water is stored in snow-covered regions with the goal of eventually creating a future snow satellite mission. More accurate snow measurements will help scientists and decisions-makers better understand our world’s water supply and better predict floods and droughts. Data acquired from the SnowEx campaign will be stored at the National Snow and Ice Data Center in Boulder, Colorado, and will be available to anyone to order at no cost, as is the case with all NASA data.For more information:NASA's SnowEx Challenges the Sensing Techniques...'Until They Break'NASA: Snow Science in Support of Our Nation's Water Supply || ", "hits": 32 }, { "id": 12496, "url": "https://svs.gsfc.nasa.gov/12496/", "result_type": "B-Roll", "release_date": "2017-02-22T17:00:00-05:00", "title": "SnowEx Field Campaign: 4K B-roll From The P-3 Orion Aircraft", "description": "SnowEx is a NASA led multi-year research campaign to improve measurements of how much snow is on the ground at any given time and how much liquid water is contained in that snow.Five aircraft with a total of ten different sensors will participate in the SnowEx campaign. From a base of operations at Peterson Air Force Base, Colorado Springs, SnowEx will deploy a P-3 Orion aircraft operated by the Scientific Development Squadron ONE (VXS-1), based at Naval Air Station Patuxent River, Maryland. A King Air plane will fly out of Grand Junction, Colorado, while high-altitude NASA jets will fly from Johnson Space Center in Houston.The planes will carry passive and active microwave sensors that are good at measuring snow-water equivalent in dry snow, but are less optimal for measuring snow forests or light snow cover. The campaign will also deploy an airborne laser instrument to measure snow depth, and airborne sensors to measure surface temperature and reflected light from snow.Data acquired from the SnowEx campaign will be stored at the National Snow and Ice Data Center in Boulder, Colorado, and will be available to anyone to order at no cost, as is the case with all NASA data.For more information: https://www.nasa.gov/earthexpeditions || ", "hits": 31 }, { "id": 12489, "url": "https://svs.gsfc.nasa.gov/12489/", "result_type": "B-Roll", "release_date": "2017-02-14T02:00:00-05:00", "title": "SnowEx Field Campaign: B-roll From The P-3 Orion Aircraft", "description": "SnowEx is a NASA led multi-year research campaign to improve measurements of how much snow is on the ground at any given time and how much liquid water is contained in that snow.Five aircraft with a total of ten different sensors will participate in the SnowEx campaign. From a base of operations at Peterson Air Force Base, Colorado Springs, SnowEx will deploy a P-3 Orion aircraft operated by the Scientific Development Squadron ONE (VXS-1), based at Naval Air Station Patuxent River, Maryland. A King Air plane will fly out of Grand Junction, Colorado, while high-altitude NASA jets will fly from Johnson Space Center in Houston. The planes will carry passive and active microwave sensors that are good at measuring snow-water equivalent in dry snow, but are less optimal for measuring snow forests or light snow cover. The campaign will also deploy an airborne laser instrument to measure snow depth, and airborne sensors to measure surface temperature and reflected light from snow.Data acquired from the SnowEx campaign will be stored at the National Snow and Ice Data Center in Boulder, Colorado, and will be available to anyone to order at no cost, as is the case with all NASA data.For more information: https://www.nasa.gov/earthexpeditions || ", "hits": 26 }, { "id": 12490, "url": "https://svs.gsfc.nasa.gov/12490/", "result_type": "B-Roll", "release_date": "2017-02-13T00:00:00-05:00", "title": "SnowEx Field Campaign: B-roll From Grand Mesa", "description": "SnowEx is a NASA led multi-year research campaign to improve measurements of how much snow is on the ground at any given time and how much liquid water is contained in that snow.Starting in February, teams of 50 researchers are stationed at Grand Mesa and Senator Beck Basin over a three-week period to measure snow using a variety of snow-sensing instruments and techniques.Ground measurements will allow the team to validate the remotely-sensed measurements acquired by the multiple sensors on the various aircraft.Data acquired from the SnowEx campaign will be stored at the National Snow and Ice Data Center in Boulder, Colorado, and will be available to anyone to order at no cost, as is the case with all NASA data. For more information: https://www.nasa.gov/earthexpeditions/ || ", "hits": 24 }, { "id": 3899, "url": "https://svs.gsfc.nasa.gov/3899/", "result_type": "Visualization", "release_date": "2017-01-04T00:00:00-05:00", "title": "Seasonal sea ice and snow cover visualizations", "description": "Seasonal snow cover and sea ice across the globe from September 2010 to August 2011 || FlatMap_1920x108060fps_0000_print.jpg (1024x576) [99.4 KB] || FlatMap_1920x108060fps_0000_searchweb.png (320x180) [65.9 KB] || FlatMap_1920x108060fps_0000_web.png (320x180) [65.9 KB] || FlatMap_1920x108060fps_0000_thm.png (80x40) [5.8 KB] || Global (1920x1080) [0 Item(s)] || Global (1920x1080) [0 Item(s)] || Global (1280x720) [0 Item(s)] || FlatMap_1920x1080_p30.mp4 (1920x1080) [13.3 MB] || FlatMap_1280x720_p30.mp4 (1280x720) [8.2 MB] || FlatMap_1280x720_p30.webm (1280x720) [3.6 MB] || FlatMap_1920x1080_p30.mp4.hwshow [187 bytes] || ", "hits": 40 }, { "id": 11899, "url": "https://svs.gsfc.nasa.gov/11899/", "result_type": "Produced Video", "release_date": "2015-07-21T13:00:00-04:00", "title": "Scientists Link Earlier Melting Of Snow To Dark Aerosols", "description": "Tiny particles suspended in the air, known as aerosols, can darken snow and ice causing it to absorb more of the sun’s energy. But until recently, scientists rarely considered the effect of all three major types of light-absorbing aerosols together in climate models.In a new study, NASA scientists used a climate model to examine the impact of this snow-darkening phenomenon on Northern Hemisphere snowpacks, including how it affects snow amount and heating on the ground in spring.The study looked at three types of light-absorbing aerosols – dust, black carbon and organic carbon. Black carbon and organic carbon are produced from the burning of fossil fuels, like coal and oil, as well as biofuels and biomass, such as forests.With their snow darkening effect added to NASA’s GEOS-5 climate model, scientists analyzed results from 2002 to 2011, and compared them to model runs done without the aerosols on snow. They found that the aerosols indeed played a role in absorbing more of the sun’s energy. Over broad places in the Northern Hemisphere, the darkened snow caused some surface temperatures to be up to 10 degrees Fahrenheit warmer than it would be if the snow were pristine. As a result, warmer, snow-darkened areas had less snow in spring than they would have had under pristine snow conditions.According to the study, dust’s snow darkening effect significantly contributed to surface warming in Central Asia and the western Himalayas. Black carbon’s snow darkening effect had a larger impact primarily in Europe, the eastern Himalayas and East Asia. It had a smaller impact in North America. Organic carbon’s snow darkening effect was relatively lower but present in regions such as southeastern Siberia, northeastern East Asia and western Canada.“As we add more of these aerosols to the mix, we are potentially increasing our overall impact on Earth’s climate,” said research scientist Teppei Yasunari at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.Research: Impact of snow darkening via dust, black carbon, and organic carbon on boreal spring climate in the Earth systemJournal: Geophysical Research: Atmospheres, June 15, 2015.Link to paper: http://onlinelibrary.wiley.com/doi/10.1002/2014JD022977/fullHere is the YouTube video. || ", "hits": 88 }, { "id": 4205, "url": "https://svs.gsfc.nasa.gov/4205/", "result_type": "Visualization", "release_date": "2014-09-24T09:00:00-04:00", "title": "Earth Science Heads-up Display", "description": "On September 10, 2014, NASA's Earth Observing System (EOS) was celebrated in an evening event at the Smithsonian National Air and Space Museum in Washington DC. The title of this event was \"Vital Signs: Taking the Pulse of Our Planet\", and the speakers at this event included several Earth Scientists from Goddard Space Flight Center. This animation was used in the beginning of the event to illustrate the interconnectedness of the many Earth-based data sets that NASA has produced over the last decade or so. The animation simulates a view of the Earth from the International Space Station, over which interconnected data sets are displayed as if on a head-up display. || ", "hits": 50 }, { "id": 11507, "url": "https://svs.gsfc.nasa.gov/11507/", "result_type": "Produced Video", "release_date": "2014-03-19T00:00:00-04:00", "title": "Early Spring 3.20.2014 Live Shots", "description": "Broll for live shots talking about how signs of spring are coming earlier. || Early Spring Live Shot Roll Ins || Early_Spring_Roll_Ins-sm.1_print.jpg (1280x720) [129.0 KB] || Early_Spring_Roll_Ins-sm_web.png (320x180) [72.5 KB] || Early_Spring_Roll_Ins-sm_thm.png (80x40) [5.7 KB] || Early_Spring_Roll_Ins.webmhd.webm (960x540) [41.6 MB] || Early_Spring_Roll_Ins-sm.mov (650x366) [64.4 MB] || Early_Spring_Roll_Ins.mov (1280x720) [2.7 GB] || ", "hits": 29 }, { "id": 3885, "url": "https://svs.gsfc.nasa.gov/3885/", "result_type": "Visualization", "release_date": "2013-11-29T00:00:00-05:00", "title": "Components of the Cryosphere", "description": "This high resolution image, designed for the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, shows the extent of the regions affected by components of the cryosphere around the world. Over land, continuous permafrost is shown in a dark pink while discontinuous permafrost is shown in a lighter shade of pink. Over much of the northern hemisphere's land area, a semi-transparent white veil depicts the regions that are affected by snowfall at least one day during the perion 2000-2012. The bright green line along the southern border of this region shows the maximum snow extent while a black line across the North America, Europe and Asia shows the 50% snow extent line. Glaciers are shown as small golden dots in mountainous areas and in the far northern and southern latitudes. Over the water, ice shelves are shown around Antarctica along with sea ice surrounding the ice shelves. Sea ice is also shown at the North Pole, where the 30 year average sea ice extent is shown by a yellow outline. In addition, the ice sheets of Greenland and Antarctica are clearly visible. || ", "hits": 58 }, { "id": 30372, "url": "https://svs.gsfc.nasa.gov/30372/", "result_type": "Hyperwall Visual", "release_date": "2013-10-24T12:00:00-04:00", "title": "Monthly Snow Cover", "description": "Snow and ice cover most of the Earth's polar regions throughout the year, but the coverage at lower latitudes changes with the seasons. Northern Hemisphere snow cover changes dramatically throughout the year, but the only significant snow cover in the Southern Hemisphere is in Antarctica, which has very few snow-free areas at any time of the year. These maps show monthly snow cover data from February 2000 to the present, derived using observations from the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard NASA's Terra satellite. The colors show the percent of land area that is covered with snow. The white areas show lands that were completely snow-covered, while the light blue shades show regions in which there was only partial snow cover. || ", "hits": 50 }, { "id": 11054, "url": "https://svs.gsfc.nasa.gov/11054/", "result_type": "Produced Video", "release_date": "2012-08-02T12:00:00-04:00", "title": "Earth's Water Cycle", "description": "Water is the fundamental ingredient for life on Earth. Looking at our Earth from space, with its vast and deep ocean, it appears as though there is an abundance of water for our use. However, only a small portion of Earth's water is accessible for our needs. How much fresh water exists and where it is stored affects us all. This animation uses Earth science data from a variety of sensors on NASA Earth observing satellites as well as cartoons to describe Earth's water cycle and the continuous movement of water on, above and below the surface of the Earth. Sensors on a suite of NASA satellites observe and measure water on land, in the ocean and in the atmosphere. These measurements are important to understanding the availability and distribution of Earth's water — vital to life and vulnerable to the impacts of climate change on a growing world population.NASA Earth Observing System Data and Information Systems (EOSDIS) EOSDIS is a distributed system of twelve data centers and science investigator processing systems. EOSDIS processes, archives, and distributes data from Earth observing satellites, field campaigns, airborne sensors, and related Earth science programs. These data enable the study of Earth from space to advance scientific understanding.For questions, please contact eosdis-outreach@lists.nasa.gov || ", "hits": 156 }, { "id": 3944, "url": "https://svs.gsfc.nasa.gov/3944/", "result_type": "Visualization", "release_date": "2012-05-14T00:00:00-04:00", "title": "Pulse of Snow and Sea Ice", "description": "Snow and sea ice in the Northern and Southern Hemispheres pulse at exact opposite times of year, constantly out of phase. || ", "hits": 72 }, { "id": 3928, "url": "https://svs.gsfc.nasa.gov/3928/", "result_type": "Visualization", "release_date": "2012-04-07T00:00:00-04:00", "title": "North America Snow Cover 2009-2012", "description": "This entry features visualization material of daily snow cover over North America from July 1, 2009 - March 11, 2012 and still images of snow cover in the Western region of United States. || ", "hits": 46 }, { "id": 3934, "url": "https://svs.gsfc.nasa.gov/3934/", "result_type": "Visualization", "release_date": "2012-04-07T00:00:00-04:00", "title": "North America Snow Cover Maps", "description": "This entry contains Snow Cover Maps for Norh America with statelines, using the MODIS Cloud-gap-filled (CGF) Product at ~25-km resolution. The MODIS CGF product seeks to provide clear snow observations by filling cloudy areas on a given day with clear observations from previous days.The usual source for this product is the MOD10C1 MODIS/Terra Snow Cover Daily L3 Global 0.05Deg CMG, Version 5 and a variant has been coded that can use MOD10A1 MODIS/Aqua Snow Cover Daily L3 Global 500m Grid, Version 5 as source. Maps are provided for various dates for 2006, 2010, 2011 and 2012, to compare snow cover between years. || ", "hits": 165 }, { "id": 10912, "url": "https://svs.gsfc.nasa.gov/10912/", "result_type": "Produced Video", "release_date": "2012-02-02T00:00:00-05:00", "title": "Uncovering Winter's Mystery Recap", "description": "This is a recap of the satellite media tour \"NASA Uncovers Winter's Mystery,\" featuring Tom Wagner and Gail Skofronick-Jackson. || ", "hits": 18 }, { "id": 3907, "url": "https://svs.gsfc.nasa.gov/3907/", "result_type": "Visualization", "release_date": "2012-01-31T12:00:00-05:00", "title": "NASA's DC-8 Airborne Science Laboratory Flight Path Jan 19, 2012", "description": "NASA is flying an airborne science laboratory through Canadian snowstorms for six weeks in support of a difficult task of the upcoming Global Precipitation Measurement (GPM) mission: measuring snowfall from space. GPM is an international satellite mission scheduled for launch in 2014 that will provide next-generation observations of worldwide rain and snow every three hours. It is the first precipitation mission designed to detect falling snow from space. NASA's DC-8 flying laboratory flew this flight path on Jan 19, 2012 in support of NASA's Global Precipitation Measurement Cold-season Precipitation Experiment (GCPEx) snow study. The GCPEx field campaign will help scientists match measurements of snow in the air and on the ground. || ", "hits": 33 }, { "id": 10890, "url": "https://svs.gsfc.nasa.gov/10890/", "result_type": "Produced Video", "release_date": "2012-01-10T12:00:00-05:00", "title": "NASA Airborne Cold Weather Experiment Measures Falling Snow", "description": "NASA is flying an airborne science laboratory through Canadian snowstorms for six weeks in support of a difficult task of the upcoming Global Precipitation Measurement (GPM) mission: measuring snowfall from space. GPM is an international satellite mission scheduled for launch in 2014 that will provide next-generation observations of worldwide rain and snow every three hours. It is the first precipitation mission designed to detect falling snow from space. || ", "hits": 33 }, { "id": 3619, "url": "https://svs.gsfc.nasa.gov/3619/", "result_type": "Visualization", "release_date": "2009-09-01T18:00:00-04:00", "title": "A Tour of the Cryosphere 2009", "description": "The cryosphere consists of those parts of the Earth's surface where water is found in solid form, including areas of snow, sea ice, glaciers, permafrost, ice sheets, and icebergs. In these regions, surface temperatures remain below freezing for a portion of each year. Since ice and snow exist relatively close to their melting point, they frequently change from solid to liquid and back again due to fluctuations in surface temperature. Although direct measurements of the cryosphere can be difficult to obtain due to the remote locations of many of these areas, using satellite observations scientists monitor changes in the global and regional climate by observing how regions of the Earth's cryosphere shrink and expand.This animation portrays fluctuations in the cryosphere through observations collected from a variety of satellite-based sensors. The animation begins in Antarctica, showing some unique features of the Antarctic landscape found nowhere else on earth. Ice shelves, ice streams, glaciers, and the formation of massive icebergs can be seen clearly in the flyover of the Landsat Image Mosaic of Antarctica. A time series shows the movement of iceberg B15A, an iceberg 295 kilometers in length which broke off of the Ross Ice Shelf in 2000. Moving farther along the coastline, a time series of the Larsen ice shelf shows the collapse of over 3,200 square kilometers ice since January 2002. As we depart from the Antarctic, we see the seasonal change of sea ice and how it nearly doubles the apparent area of the continent during the winter.From Antarctica, the animation travels over South America showing glacier locations on this mostly tropical continent. We then move further north to observe daily changes in snow cover over the North American continent. The clouds show winter storms moving across the United States and Canada, leaving trails of snow cover behind. In a close-up view of the western US, we compare the difference in land cover between two years: 2003 when the region received a normal amount of snow and 2002 when little snow was accumulated. The difference in the surrounding vegetation due to the lack of spring melt water from the mountain snow pack is evident.As the animation moves from the western US to the Arctic region, the areas affected by permafrost are visible. As time marches forward from March to September, the daily snow and sea ice recede and reveal the vast areas of permafrost surrounding the Arctic Ocean.The animation shows a one-year cycle of Arctic sea ice followed by the mean September minimum sea ice for each year from 1979 through 2008. The superimposed graph of the area of Arctic sea ice at this minimum clearly shows the dramatic decrease in Artic sea ice over the last few years.While moving from the Arctic to Greenland, the animation shows the constant motion of the Arctic polar ice using daily measures of sea ice activity. Sea ice flows from the Arctic into Baffin Bay as the seasonal ice expands southward. As we draw close to the Greenland coast, the animation shows the recent changes in the Jakobshavn glacier. Although Jakobshavn receded only slightly from 1964 to 2001, the animation shows significant recession from 2001 through 2009. As the animation pulls out from Jakobshavn, the effect of the increased flow rate of Greenland costal glaciers is shown by the thinning ice shelf regions near the Greenland coast.This animation shows a wealth of data collected from satellite observations of the cryosphere and the impact that recent cryospheric changes are making on our planet.For more information on the data sets used in this visualization, visit NASA's EOS DAAC website.Note: This animation is an update of the animation 'A Short Tour of the Cryosphere', which is itself an abridged version of the animation 'A Tour of the Cryosphere'. The popularity of the earlier animations and their continuing relevance prompted us to update the datasets in parts of the animation and to remake it in high definition. In certain cases, our experiences in using the earlier work have led us to tweak the presentation of some of the material to make it clearer. Our thanks to Dr. Robert Bindschadler for suggesting and supporting this remake. || ", "hits": 54 }, { "id": 3565, "url": "https://svs.gsfc.nasa.gov/3565/", "result_type": "Visualization", "release_date": "2008-10-30T00:00:00-04:00", "title": "Aqua MODIS: Snow Cover designed for Science On a Sphere (SOS) and WMS", "description": "The Moderate Resolution Imaging Spectroradiometer (MODIS) provides data in 36 spectral bands, some of which are used to map global snow cover. However, MODIS can only take measurements of the surface in daylight, cloud-free areas. For this animation, valid snowcover measurements are retained over time during darkness or cloudy days until a subsequent valid measurement is found. This animation shows the dynamic advance and retreat of MODIS daily snow cover from September 1, 2002 through September 20, 2008. || ", "hits": 38 }, { "id": 3383, "url": "https://svs.gsfc.nasa.gov/3383/", "result_type": "Visualization", "release_date": "2007-03-17T12:00:00-04:00", "title": "Sequence of Clouds, Snow Cover, Sea Ice, Sea Surface Temperature and Biosphere", "description": "This animation is part of an NSF-funded, international project, Exploring Time. The two-hour television special, broadcast on the Discovery Channel in the spring of 2007, explores how the world changes over different timescales ... from billionths of seconds to billions of years. This animation portrays a variety of remotely sensed data elements at different temporal resolutions.Initially, the animation shows cloud cover in motion over North America in half-hour increments from Nov. 26 to Dec. 7, 2005. The temporal pace quickens to show a 5-day moving average of daily MODIS snow cover along with daily AMSR-E sea ice from Dec. 7, 2005 to Mar. 15, 2006. As the view swings south over the Gulf of Mexico, the AMSR-E Sea Surface Temperature reveals warming ocean temperatures from March through August, 2006. As it passes over the Atlantic Ocean, the biosphere fades into view, showing both chlorophyll concentration in the ocean along with Normalized Difference Vegetation Index over the land areas. The biosphere animates over time while the view pans over northern Africa and Europe, showing data collected from September 2002 through February 2006.This program was also broadcast in Japan through a partnership with the NHK international broadcasting service and in France through a partnership with the ARTE television network. || ", "hits": 37 }, { "id": 3373, "url": "https://svs.gsfc.nasa.gov/3373/", "result_type": "Visualization", "release_date": "2006-09-30T00:00:00-04:00", "title": "Zoom from Jakobshavn Glacier with AMSR-E Daily Sea Ice and MODIS Daily Snow Cover", "description": "Beginning from a view of Greenland's Jakobshavn glacier, this animation shows motion of sea ice and snow cover over the Arctic from 10/1/2002 through 6/23/2003 as the camera pulls out to frame the full globe. The false color of the sea ice is derived from the AMSR-E 6.25 km brightness temperature. The sea ice extent is defined by AMSR-E 12.5 km sea ice concentration, identifying all regions having a sea ice concentration of greater than 15%. Because AMSR-E is a passive microwave sensor that functions independently from atmospheric effects, this sensor is able to observe the entire polar region every day, even through clouds and snowfalls. || ", "hits": 25 }, { "id": 2925, "url": "https://svs.gsfc.nasa.gov/2925/", "result_type": "Visualization", "release_date": "2006-06-13T12:00:00-04:00", "title": "Daily Snow over North America 2002-2003 with Permafrost Map", "description": "This animation shows daily snow cover over North America from September 1, 2002 through June 30, 2003. A permafrost map shown in frost-green indicates where the ground is frozen throughout the year. The sea ice climatology indicates the average extent of the sea ice during each month. || ", "hits": 39 }, { "id": 3355, "url": "https://svs.gsfc.nasa.gov/3355/", "result_type": "Visualization", "release_date": "2006-05-20T23:55:00-04:00", "title": "A Short Tour of the Cryosphere", "description": "A newer version of this animation is available here.This narrated, 5-minute animation shows a wealth of data collected from satellite observations of the cryosphere and the impact that recent cryospheric changes are making on our planet. This is a shorter version of a narrated, 7 1/2 minute animation entitled 'A Tour of the Cryosphere'.See the above link for a detailed description of the full animation.Two sections have been removed from the original animation: one showing a flyby of the South Pole station and glaciers feeding the Ross Ice Shelf and one showing solar data related to the Earth's energy balance.For more information on the data sets used in this visualization, visit NASA's EOS DAAC website. || ", "hits": 33 }, { "id": 3353, "url": "https://svs.gsfc.nasa.gov/3353/", "result_type": "Visualization", "release_date": "2006-04-17T00:00:00-04:00", "title": "Terra/Aqua MODIS: Snow Cover and Sea Ice Surface Temperature", "description": "This animation shows MODIS daily measurements of both snow cover and sea ice surface temperature in the Northern Hemisphere for the winter of 2002-2003. MODIS can only take measurements in daylight, so measurements during the polar winter night are taken from the last valid measurement. || ", "hits": 28 }, { "id": 3181, "url": "https://svs.gsfc.nasa.gov/3181/", "result_type": "Visualization", "release_date": "2005-12-04T23:55:00-05:00", "title": "A Tour of the Cryosphere", "description": "A new HD version of this animation is available here.Click here to go to the media download section.The cryosphere consists of those parts of the Earth's surface where water is found in solid form, including areas of snow, sea ice, glaciers, permafrost, ice sheets, and icebergs. In these regions, surface temperatures remain below freezing for a portion of each year. Since ice and snow exist relatively close to their melting point, they frequently change from solid to liquid and back again due to fluctuations in surface temperature. Although direct measurements of the cryosphere can be difficult to obtain due to the remote locations of many of these areas, using satellite observations scientists monitor changes in the global and regional climate by observing how regions of the Earth's cryosphere shrink and expand.This animation portrays fluctuations in the cryosphere through observations collected from a variety of satellite-based sensors. The animation begins in Antarctica, showing ice thickness ranging from 2.7 to 4.8 kilometers thick along with swaths of polar stratospheric clouds. In a tour of this frozen continent, the animation shows some unique features of the Antarctic landscape found nowhere else on earth. Ice shelves, ice streams, glaciers, and the formation of massive icebergs can be seen. A time series shows the movement of iceberg B15A, an iceberg 295 kilometers in length which broke off of the Ross Ice Shelf in 2000. Moving farther along the coastline, a time series of the Larsen ice shelf shows the collapse of over 3,200 square kilometers ice since January 2002. As we depart from the Antarctic, we see the seasonal change of sea ice and how it nearly doubles the size of the continent during the winter.From Antarctica, the animation travels over South America showing areas of permafrost over this mostly tropical continent. We then move further north to observe daily changes in snow cover over the North American continent. The clouds show winter storms moving across the United States and Canada, leaving trails of snow cover behind. In a close-up view of the western US, we compare the difference in land cover between two years: 2003 when the region received a normal amount of snow and 2002 when little snow was accumulated. The difference in the surrounding vegetation due to the lack of spring melt water from the mountain snow pack is evident.As the animation moves from the western US to the Arctic region, the areas effected by permafrost are visible. In December, we see how the incoming solar radiation primarily heats the Southern Hemisphere. As time marches forward from December to June, the daily snow and sea ice recede as the incoming solar radiation moves northward to warm the Northern Hemisphere.Using satellite swaths that wrap the globe, the animation shows three types of instantaneous measurements of solar radiation observed on June 20, 2003: shortwave (reflected) radiation, longwave (thermal) radiation and net flux (showing areas of heating and cooling). Correlation between reflected radiation and clouds are evident. When the animation fades to show the monthly global average net flux, we see that the polar regions serve to cool the global climate by radiating solar energy back into space throughout the year.The animation shows a one-year cycle of the monthly average Arctic sea ice concentration followed by the mean September minimum sea ice for each year from 1979 through 2004. A red outline indicates the mean sea ice extent for September over 22 years, from 1979 to 2002. The minimum Arctic sea ice animation clearly shows how over the last 5 years the quantity of polar ice has decreased by 10 - 14% from the 22 year average.While moving from the Arctic to Greenland, the animation shows the constant motion of the Arctic polar ice using daily measures of sea ice activity. Sea ice flows from the Arctic into Baffin Bay as the seasonal ice expands southward. As we draw close to the Greenland coast, the animation shows the recent changes in the Jakobshavn glacier. Although Jakobshavn receded only slightly from 1042 to 2001, the animation shows significant recession over the past three years, from 2002 through 2004.This animation shows a wealth of data collected from satellite observations of the cryosphere and the impact that recent cryospheric changes are making on our planet.For more information on the data sets used in this visualization, visit NASA's EOS DAAC website. || ", "hits": 94 }, { "id": 3180, "url": "https://svs.gsfc.nasa.gov/3180/", "result_type": "Visualization", "release_date": "2005-07-31T00:00:00-04:00", "title": "MODIS Daily Global Snow Cover and Sea Ice Surface Temperature as seen in the SIGGRAPH 2005 Electronic Theater", "description": "This animation showing snow cover and sea ice surface temperature in the Northern Hemisphere portrays data collected from daily MODIS satellite images acquired during the winter of 2002-2003. Darkness increases with the onset of autumn, reaching a maximum at the Winter Solstice on December 21st. Thereafter, the circle of darkness shrinks as the period of daylight increases. Daily changes in sea ice are shown as ice surface temperature, which is related to the air temperature and the concentration of the sea ice. Sea ice surface temperatures range from about -40 to -2 degrees Celsius. Here, ice surface temperatures are depicted by colors, described by a color bar shown below. The snow tracks of several winter storms across the United States can be clearly seen. With an albedo of up to 80 percent or more, snow-covered terrain reflects most of the incoming solar radiation back into space, cooling the lower atmosphere. When snow cover melts, the albedo drops suddenly to less than about 30 percent, allowing the ground to absorb more solar radiation, heating the Earth's surface and lower atmosphere. Rapid changes in albedo, resultingfrom snowfall and snow melt, cause significant changes in the regional energy balance. This animation was accepted into the prestigious 2005 SIGGRAPH Electronic Theater, where it was shown during the annual conference from July 31 through August 4, 2005 in Los Angeles, CA. For more information on the data sets used in this visualization, visit NASA's EOS DAAC website. || ", "hits": 32 }, { "id": 3185, "url": "https://svs.gsfc.nasa.gov/3185/", "result_type": "Visualization", "release_date": "2005-07-01T00:00:00-04:00", "title": "Monthly Snow Climatology, 1979-2002 (WMS)", "description": "The extent of snow and ice that covers the earth's surface in the northern hemisphere grows and shrinks with the seasons. This animations shows the average snow and ice cover for a given month over a 24-year period, 1979 - 2002. It shows how often a particular point is covered with snow in a given month. The SVS Image Server gives each particular image in the animation the last date for which the data was used in creating that image, even though each of the images covers a span of years for a particular month. || ", "hits": 15 }, { "id": 3027, "url": "https://svs.gsfc.nasa.gov/3027/", "result_type": "Visualization", "release_date": "2005-01-12T12:00:00-05:00", "title": "Snow Cover over North America during the Winter of 2001-2002 (WMS)", "description": "The amount of snow covering the land has both short and long term effects on the environment. From season to season, snow coverage and depth affect soil moisture and water availability, which directly influence agriculture, wildfire occurrences, and drought. In the long term, the part of the Earth's surface covered by snow reflects up to 80 or 90 percent of the incoming solar radiation as opposed to the 10 or 20 percent that uncovered land reflects, and this has important consequences for the Earth's climate. Satellites identify the snow cover precisely by looking at the difference between light reflected off snow in the visible and the infrared wavelengths. This visualization shows the snow cover over North America from October, 2001, through April, 2002, as measured by the MODIS instrument on the Terra satellite. Since this instrument cannot measure snow cover through clouds, this visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than 50% snow coverage in that area. This area is assumed to be covered in snow until the instrument takes a valid measurement showing less than 40% coverage in that same area. In this animation, snow coverage is measured every 8 days. || ", "hits": 17 }, { "id": 2932, "url": "https://svs.gsfc.nasa.gov/2932/", "result_type": "Visualization", "release_date": "2004-12-31T12:00:00-05:00", "title": "Daily Snow over North America 2002-2003 without Permafrost Map", "description": "This animation shows daily snow cover over North America from September 1, 2002 through June 30, 2003. The sea ice climatology indicates the average extent of the sea ice during each month. || ", "hits": 30 }, { "id": 2981, "url": "https://svs.gsfc.nasa.gov/2981/", "result_type": "Visualization", "release_date": "2004-09-25T12:00:00-04:00", "title": "Global Daily Snow and Sea Ice Surface Temperature", "description": "This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over the Northern Hemisphere from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior day's value is retained until a valid data reading is obtained. This visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than ~50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a gray cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in land cover. || ", "hits": 30 }, { "id": 2982, "url": "https://svs.gsfc.nasa.gov/2982/", "result_type": "Visualization", "release_date": "2004-09-25T12:00:00-04:00", "title": "Daily Snow and Sea Ice Temperature over the North Pole", "description": "This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over the Northern Hemisphere from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior day's value is retained until a valid data reading is obtained. This visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than ~50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a gray cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in land cover. || ", "hits": 38 }, { "id": 2983, "url": "https://svs.gsfc.nasa.gov/2983/", "result_type": "Visualization", "release_date": "2004-09-25T12:00:00-04:00", "title": "Daily Snow and Sea Ice Temperature over North America", "description": "This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over North America from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior day's value is retained until a valid data reading is obtained. This visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than ~50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a gray cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in land cover. || ", "hits": 81 }, { "id": 2984, "url": "https://svs.gsfc.nasa.gov/2984/", "result_type": "Visualization", "release_date": "2004-09-25T12:00:00-04:00", "title": "Daily Snow and Sea Ice Temperature over Europe", "description": "This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over Europe from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior day's value is retained until a valid data reading is obtained. This visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than ~50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a gray cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in land cover. || ", "hits": 52 }, { "id": 2985, "url": "https://svs.gsfc.nasa.gov/2985/", "result_type": "Visualization", "release_date": "2004-09-25T12:00:00-04:00", "title": "Daily Snow and Sea Ice Temperature over Asia", "description": "This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over Asia from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior day's value is retained until a valid data reading is obtained. This visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than ~50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a gray cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in land cover. || ", "hits": 28 }, { "id": 2899, "url": "https://svs.gsfc.nasa.gov/2899/", "result_type": "Visualization", "release_date": "2004-02-11T12:00:00-05:00", "title": "Snow Cover over the Northern Hemisphere During the Winter of 2002-2003 (WMS)", "description": "The amount of snow covering the land has both short and long term effects on the environment. From season to season, snow coverage and depth affect soil moisture and water availability, which directly influence agriculture, wildfire occurrences, and drought. In the long term, the part of the Earth's surface covered by snow reflects up to 80 or 90 percent of the incoming solar radiation as opposed to the 10 or 20 percent that uncovered land reflects, and this has important consequences for the Earth's climate. Satellites identify the snow cover precisely by looking at the difference between light reflected off snow in the visible and the infrared wavelengths. This visualization shows the snow cover in the Northern Hemisphere from September, 2002, through June, 2003, as measured by the MODIS instrument on the Terra satellite. Since this instrument cannot measure snow cover through clouds, this visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than 50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. It is possible to see topographic features in the snow cover such as the Rocky Mountains and the Himalayas, and large snow coverage paths from storms that cross the plains of the United States and Russia can also be seen. || ", "hits": 43 }, { "id": 2724, "url": "https://svs.gsfc.nasa.gov/2724/", "result_type": "Visualization", "release_date": "2003-04-03T12:00:00-05:00", "title": "Snow Cover over the USA during the Winter of 2001/2002", "description": "A time-series of snow cover derived from 8-day composite snow maps between December 2001 and February 2002 is animated. || a002724.00005_print.png (720x480) [542.7 KB] || USA2002large_pre.jpg (320x240) [18.8 KB] || a002724.webmhd.webm (960x540) [2.2 MB] || USA2002large.mpg (640x480) [1.5 MB] || a002724.m2v (720x480) [9.2 MB] || a002724.dv (720x480) [44.6 MB] || a002724.mp4 (640x480) [2.1 MB] || a002724_320x240.mpg (320x240) [2.5 MB] || ", "hits": 36 }, { "id": 2725, "url": "https://svs.gsfc.nasa.gov/2725/", "result_type": "Visualization", "release_date": "2003-04-03T12:00:00-05:00", "title": "Snow Cover over the USA during the Winter of 2002/2003", "description": "A time-series of snow cover derived from 8-day compositesnow maps between December 2002 and February 2003 is animated. || a002725.00005_print.png (720x480) [535.8 KB] || USA2003large_pre.jpg (320x240) [17.7 KB] || a002725.webmhd.webm (960x540) [2.3 MB] || USA2003large.mpg (640x480) [1.5 MB] || a002725.m2v (720x480) [9.7 MB] || a002725.dv (720x480) [41.2 MB] || a002725.mp4 (640x480) [2.2 MB] || a002725_320x240.mpg (320x240) [2.7 MB] || ", "hits": 48 }, { "id": 2726, "url": "https://svs.gsfc.nasa.gov/2726/", "result_type": "Visualization", "release_date": "2003-04-03T12:00:00-05:00", "title": "Comparison of Snow Cover over the USA during the Winters of 2001/2002 and 2002/2003", "description": "This animation compares snow cover between December and February of 2001-02 with the same time period in 2002-03 using 8-day composite snow maps. The snow cover from the winter of 2002-03 is shown in white while the areas that had snow in 2001-02 but not in 2002-03 are shown in blue. || ", "hits": 19 }, { "id": 2485, "url": "https://svs.gsfc.nasa.gov/2485/", "result_type": "Visualization", "release_date": "2002-07-04T12:00:00-04:00", "title": "MODIS Snow Cover over Asia", "description": "The Moderate Resolution Imaging Spectroradiometer (MODIS) provides data in 36 spectral bands, some of which are used in an algorithm to map global snow cover. The animation shows the dynamic behavior of the advance and retreat of continental snow cover over Asia for the winter of 2001-02 from MODIS-derived 8-day composite snow maps with a spatial resolution of about 5 km. || ", "hits": 39 }, { "id": 2486, "url": "https://svs.gsfc.nasa.gov/2486/", "result_type": "Visualization", "release_date": "2002-07-04T12:00:00-04:00", "title": "MODIS Snow Cover over Europe", "description": "The Moderate Resolution Imaging Spectroradiometer (MODIS) provides data in 36 spectral bands, some of which are used in an algorithm to map global snow cover. The animation shows the dynamic behavior of the advance and retreat of continental snow cover over Europe for the winter of 2001-02 from MODIS-derived 8-day composite snow maps with a spatial resolution of about 5 km. || ", "hits": 72 }, { "id": 2487, "url": "https://svs.gsfc.nasa.gov/2487/", "result_type": "Visualization", "release_date": "2002-07-04T12:00:00-04:00", "title": "MODIS Snow Cover over North America", "description": "The Moderate Resolution Imaging Spectroradiometer (MODIS) provides data in 36 spectral bands, some of which are used in an algorithm to map global snow cover. In this animation, a time series of global snow cover from MODIS-derived 8-day composite snow maps with a spatial resolution of about 5 km shows the dynamic behavior of the advance and retreat of continental snow cover over North America during the winter of 2001-02. || ", "hits": 56 }, { "id": 2488, "url": "https://svs.gsfc.nasa.gov/2488/", "result_type": "Visualization", "release_date": "2002-07-04T12:00:00-04:00", "title": "MODIS Snow Cover over the Sierra Nevada Mountains", "description": "The Moderate Resolution Imaging Spectroradiometer (MODIS) provides data in 36 spectral bands, some of which are used in an algorithm to map global snow cover. The animation shows a time series of MODIS snow-cover maps of the Sierra Nevada Mountains in California, derived from MODIS-derived daily snow maps with 500-m resolution for the winter and spring of 2001. || ", "hits": 12 } ] }