{
    "id": 31267,
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    "page_type": "Hyperwall Visual",
    "title": "Landsat and Sentinel NDVI, 2022",
    "description": "The Harmonized Landsat and Sentinel-2 (HLS) project is a NASA initiative aiming to produce a seamless surface reflectance record from the Operational Land Imager (OLI) and Multi-Spectral Instrument (MSI) aboard Landsat-8/9 and Sentinel-2A/B remote sensing satellites, respectively. These animations show a year's worth of HLS data near Columbus, Nebraska from 2022. One animation includes the cloudy scenes and the other has cloud-free or mostly cloud-free scenes. ||",
    "release_date": "2023-11-28T00:00:00-05:00",
    "update_date": "2026-02-06T20:08:13.316643-05:00",
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                "name": "Marit Jentoft-Nilsen",
                "employer": "Global Science and Technology, Inc."
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    "progress": "Complete",
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            "description": "The Harmonized Landsat and Sentinel-2 (HLS) project is a NASA initiative aiming to produce a seamless surface reflectance record from the Operational Land Imager (OLI) and Multi-Spectral Instrument (MSI) aboard Landsat-8/9 and Sentinel-2A/B remote sensing satellites, respectively. The HLS Version-2.0 data are available now with global coverage (except for Antarctica). With four sensors currently in this virtual constellation, HLS provides observations once every three days at the equator and more frequently with increasing latitude. But getting an observation every three days does not mean getting a clear view of the ground every three days; in most areas of the world clouds frequently obstruct the view. These animations show a year's worth of HLS data near Columbus, Nebraska from 2022. One animation includes the cloudy scenes and the other has cloud-free or mostly cloud-free scenes.",
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            "description": "A year's worth of mostly cloud-free NDVI",
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        {
            "id": 372880,
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            "widget": "Basic text",
            "title": "For More Information",
            "caption": "",
            "description": "See [hls.gsfc.nasa.gov](https://hls.gsfc.nasa.gov)",
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        "SMD"
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        {
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                {
                    "name": "Marit Jentoft-Nilsen",
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    "nasa_science_categories": [
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    "keywords": [
        "Agriculture",
        "Biosphere",
        "Earth Science",
        "Hyperwall",
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        "Vegetation",
        "Vegetation Index"
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    "related": [
        {
            "id": 12770,
            "url": "https://svs.gsfc.nasa.gov/12770/",
            "page_type": "Produced Video",
            "title": "Harmonized Landsat 8 and Sentinel-2 Data",
            "description": "Landsat 8 and Sentinel-2 satellites have spectral and spatial similarities that make using their data together possible. When the data are used together observations can be more timely and accurate. The HLS project is an effort to \"harmonize\" the data of the two satellite programs so that they can be more easily used in unison. The ultimate goal is to obtain seamless 2-3 day global surface reflectance coverage at 30 meters that removes residual differences between the sensors due to spectral bandpass and view geometry. Currently the v1.3 HLS data set encompasses 82 global test sites that cover about 7% of the global land area.Using the processing power of the NASA Earth Exchange (NEX) computer cluster at NASA Ames, the HLS workflow atmospherically corrects data from the satellites, geographically tiles the Landsat data in a manor matching the Sentinel-2 tiling, and then corrects for different sensor view angles (Bidirectional Reflectance Distribution Function, or BRDF) and does a slight band pass adjustment for the Sentinel-2 data to create the harmonized 30-meter product.The HLS team includes researchers from NASA Goddard Space Flight Center, the University of Maryland, and NASA Ames Research Center. || ",
            "release_date": "2018-03-19T18:00:00-04:00",
            "update_date": "2025-06-23T00:18:00.049428-04:00",
            "main_image": {
                "id": 409770,
                "url": "https://svs.gsfc.nasa.gov/vis/a010000/a012700/a012770/Eastern_Nebraska_HLS_NDVI_V3_large.00380_print.jpg",
                "filename": "Eastern_Nebraska_HLS_NDVI_V3_large.00380_print.jpg",
                "media_type": "Image",
                "alt_text": "A year of NDVI (Normalized Difference Vegetation Index) data of farm fields in eastern Nebraska. Branched Oak Lake, within Branched Oak State Recreation Area, is at the bottom of the screen. Lake Wanahoo is in the upper right, just north of the city of Wahoo, and the just barely visible Wahoo Municipal Airport is to the right of the lake. David City is in the upper center.In this visualization, red is bare soil and green indicates healthy, growing vegetation. The animation runs from January 1 to December 30, 2016.",
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                "height": 576,
                "pixels": 589824
            }
        }
    ],
    "sources": [],
    "products": [],
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}