The Landsat Program is a series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey. The first Landsat satellite launched in 1972 and the next satellite in the series, the Landsat Data Continuity Mission — LDCM, is scheduled to launch on February 11, 2013", "items": [], "extra_data": {} }, { "id": 347199, "url": "https://svs.gsfc.nasa.gov/11166/#media_group_347199", "widget": "Video player", "title": "", "caption": "", "description": "The Landsat Data Continuity Mission (LDCM) is a collaboration between NASA and the U.S. Geological Survey that will continue the Landsat Program's 40-year data record of monitoring Earth's landscapes from space. LDCM will expand and improve on that record with observations that advance a wide range of Earth sciences and contribute to the management of agriculture, water and forest resources.
For complete transcript, click here.", "items": [ { "id": 313748, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 469173, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011100/a011166/Screen_Shot_2013-01-10_at_10.14.41_AM.png", "filename": "Screen_Shot_2013-01-10_at_10.14.41_AM.png", "media_type": "Image", "alt_text": "The Landsat Data Continuity Mission (LDCM) is a collaboration between NASA and the U.S. Geological Survey that will continue the Landsat Program's 40-year data record of monitoring Earth's landscapes from space. 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It takes 16 days for the swaths to overlap enough to image the whole Earth.Previous Landsat sensors swept back and forth across the swath like a whisk broom to collect data. The sensor looked at a calibration source at the end of every row, which means that measurements were consistent from orbit to orbit. But this sensor design requires fast-moving parts, which are more likely to break.—and which did on Landsat 7.In contrast, the instruments on Landsat 8 view across the entire swath at once, building strips of data like a pushbroom. This approach requires no moving parts and gives the sensor detectors greater dwell time. The pushbroom instrument is smaller and lighter than previous whisk broom instruments, but its calibration is much more complex given the large number of detectors.“It was a natural step to evolve to a pushbroom sensor. The technology was proven on other satellites, and we knew we could get better accuracy. The pushbroom has no moving parts. It is a newer and more reliable technology.” explains Terry Arvidson, senior project engineer.For more information on the future of Landsat instruments, read https://landsat.gsfc.nasa.gov/landsat-9/instruments/. || ", "release_date": "2017-10-31T00:00:00-04:00", "update_date": "2023-05-03T13:47:15.499665-04:00", "main_image": { "id": 410035, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a012700/a012754/pushbroomTIFF_00620_print.jpg", "filename": "pushbroomTIFF_00620_print.jpg", "media_type": "Image", "alt_text": "The instruments on Landsat 8 have linear detector arrays, also called \"pushbroom\" detectors, which collect data across the entire image swath at once. ", "width": 1024, "height": 576, "pixels": 589824 } } ], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }