{
    "id": 31341,
    "url": "https://svs.gsfc.nasa.gov/31341/",
    "page_type": "Visualization",
    "title": "2020 Iowa Derecho",
    "description": "NASA satellites imaged the after effects of an August 2020 derecho on Iowa crops.",
    "release_date": "2025-04-11T10:30:00-04:00",
    "update_date": "2025-04-11T12:02:58.823605-04:00",
    "main_image": {
        "id": 1154258,
        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_landsat_sentinel_ndvi_2048x1152.png",
        "filename": "Iowa_derecho_landsat_sentinel_ndvi_2048x1152.png",
        "media_type": "Image",
        "alt_text": "Image showing August 7, 2020 Sentinel-2B NDVI, August 11, 2020 Landsat 8 NDVI and the NDVI difference between the two.",
        "width": 2048,
        "height": 1152,
        "pixels": 2359296
    },
    "main_video": {
        "id": 1154200,
        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_modis_landsat_sentinel_1080p30.mp4",
        "filename": "Iowa_derecho_modis_landsat_sentinel_1080p30.mp4",
        "media_type": "Movie",
        "alt_text": "Animation wiping between true color and NDVI satellite images shwoing the area near Story City, Iowa before and after a derecho.",
        "width": 1920,
        "height": 1080,
        "pixels": 2073600
    },
    "main_credits": {},
    "progress": "Complete",
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            "id": 377838,
            "url": "https://svs.gsfc.nasa.gov/31341/#media_group_377838",
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            "title": "",
            "caption": "Imagery from MODIS from August 9, 2020 and August 11, 2020, Landsat 8 from August 11, 2020 and Sentinel-2B from August 7, 2020.",
            "description": "This visualization shows how data of different spatial and temporal resolutions were combined, to identify fields damaged by a derecho on August 10, 2020.",
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                        "filename": "Iowa_derecho_modis_landsat_sentinel_1080p30.mp4",
                        "media_type": "Movie",
                        "alt_text": "Animation wiping between true color and NDVI satellite images shwoing the area near Story City, Iowa before and after a derecho.",
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                        "height": 1080,
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                        "filename": "Iowa_derecho_modis_landsat_sentinel_2160p30.mp4",
                        "media_type": "Movie",
                        "alt_text": "Animation wiping between true color and NDVI satellite images shwoing the area near Story City, Iowa before and after a derecho.",
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                    "type": "media",
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                        "id": 1154258,
                        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_landsat_sentinel_ndvi_2048x1152.png",
                        "filename": "Iowa_derecho_landsat_sentinel_ndvi_2048x1152.png",
                        "media_type": "Image",
                        "alt_text": "Image showing August 7, 2020 Sentinel-2B NDVI, August 11, 2020 Landsat 8 NDVI and the NDVI difference between the two.",
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                        "pixels": 2359296
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            "widget": "Basic text",
            "title": "",
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            "description": "A derecho caused widespread damage to millions of acres of corn and soybean crops across central Iowa. Satellite imagery before and after the event shows the damage the derecho caused. Moderate Resolution Imaging Spectroradiometer (MODIS) images one day before and one day after the derecho show the scale of the affected area, while Landsat 8 data the day after, and Sentinel-2B data from three days before can resolve sub-field level details. Normalized Difference Vegetation Index (NDVI) is an index which show vegetation health. Comparing NDVI values before and after the derecho shows the large area where it damaged or destroyed vegetation.",
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            "title": "AQUA MODIS imagery from August 9 and August 11, 2020.",
            "caption": "",
            "description": "MODIS captured imagery of Iowa before and after a derecho which occured on August 10, 2020.",
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        {
            "id": 377849,
            "url": "https://svs.gsfc.nasa.gov/31341/#media_group_377849",
            "widget": "Card gallery",
            "title": "Landsat 8 and Sentinel-2B images from before and after the August 10, 2020 derecho.",
            "caption": "",
            "description": "Landsat 8 true color and NDVI of Iowa the day after the August 10, 2020 derecho, Sentinel-2B truecolor and NDVI from three days earlier, and NDVI difference between the two dates.",
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                        "filename": "Iowa_derecho_rgb_l8_20200811_2048x1152.png",
                        "media_type": "Image",
                        "alt_text": "Landsat 8 true color of Iowa the day after the August 10, 2020 derecho",
                        "width": 2048,
                        "height": 1152,
                        "pixels": 2359296
                    }
                },
                {
                    "id": 469189,
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                    "instance": {
                        "id": 1154262,
                        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_ndvi_l8_20200811_2048x1152.png",
                        "filename": "Iowa_derecho_ndvi_l8_20200811_2048x1152.png",
                        "media_type": "Image",
                        "alt_text": "Landsat 8 NDVI of Iowa the day after the August 10, 2020 derecho",
                        "width": 2048,
                        "height": 1152,
                        "pixels": 2359296
                    }
                },
                {
                    "id": 469209,
                    "type": "media",
                    "extra_data": null,
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                    "caption": "",
                    "instance": {
                        "id": 1154282,
                        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_rgb_s2b_20200807_2048x1152.png",
                        "filename": "Iowa_derecho_rgb_s2b_20200807_2048x1152.png",
                        "media_type": "Image",
                        "alt_text": "Sentinel-2B truecolor from three days before the August 10, 2020 derecho",
                        "width": 2048,
                        "height": 1152,
                        "pixels": 2359296
                    }
                },
                {
                    "id": 469188,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": "",
                    "instance": {
                        "id": 1154261,
                        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_ndvi_s2b_20200807_2048x1152.png",
                        "filename": "Iowa_derecho_ndvi_s2b_20200807_2048x1152.png",
                        "media_type": "Image",
                        "alt_text": "Sentinel-2B NDVI from three days before the August 10, 2020 derecho",
                        "width": 2048,
                        "height": 1152,
                        "pixels": 2359296
                    }
                }
            ],
            "extra_data": {}
        },
        {
            "id": 377850,
            "url": "https://svs.gsfc.nasa.gov/31341/#media_group_377850",
            "widget": "Single image",
            "title": "NDVI change image between August 7 and August 11 using Sentinel-2B and Landsat 8 data.",
            "caption": "",
            "description": "An NDVI change image showing areas damaged by the August 10, 2020 derecho had decreased NDVI (shown as red in the image)",
            "items": [
                {
                    "id": 469191,
                    "type": "media",
                    "extra_data": null,
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                    "caption": "",
                    "instance": {
                        "id": 1154264,
                        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_ndvi_diff_aug11-aug07_2048x1152.png",
                        "filename": "Iowa_derecho_ndvi_diff_aug11-aug07_2048x1152.png",
                        "media_type": "Image",
                        "alt_text": "NDVI change image between August 7 and August 11 using Sentinel-2B and Landsat 8 data.",
                        "width": 2048,
                        "height": 1152,
                        "pixels": 2359296
                    }
                },
                {
                    "id": 469190,
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                    "instance": {
                        "id": 1154263,
                        "url": "https://svs.gsfc.nasa.gov/vis/a030000/a031300/a031341/Iowa_derecho_ndvi_diff_aug11-aug07.tif",
                        "filename": "Iowa_derecho_ndvi_diff_aug11-aug07.tif",
                        "media_type": "Image",
                        "alt_text": "NDVI change image between August 7 and August 11 using Sentinel-2B and Landsat 8 data.",
                        "width": 3840,
                        "height": 2160,
                        "pixels": 8294400
                    }
                }
            ],
            "extra_data": {}
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    ],
    "studio": "hw",
    "funding_sources": [],
    "credits": [
        {
            "role": "Visualizer",
            "people": [
                {
                    "name": "Marit Jentoft-Nilsen",
                    "employer": "Global Science and Technology, Inc."
                }
            ]
        }
    ],
    "missions": [],
    "series": [],
    "tapes": [],
    "papers": [],
    "datasets": [
        {
            "name": "",
            "common_name": "",
            "platform": "Aqua",
            "sensor": "MODIS",
            "type": "Other",
            "organizations": [],
            "description": "",
            "credit": "",
            "url": "",
            "date_range": "August 9-11, 2020"
        },
        {
            "name": "",
            "common_name": "",
            "platform": "Landsat-8",
            "sensor": "OLI",
            "type": "Other",
            "organizations": [],
            "description": "Band combination 431",
            "credit": "",
            "url": "",
            "date_range": "August 11, 2020"
        },
        {
            "name": "",
            "common_name": "Sentinel-2",
            "platform": "Sentinel-2B",
            "sensor": "MSI",
            "type": "Observed Data",
            "organizations": [
                "ESA"
            ],
            "description": "",
            "credit": "",
            "url": "",
            "date_range": "August 7, 2020"
        }
    ],
    "nasa_science_categories": [
        "Earth"
    ],
    "keywords": [
        "Agriculture",
        "Crop/Plant Yields",
        "Iowa",
        "Land Surface/agriculture Indicators",
        "NDVI",
        "Plant Characteristics",
        "Vegetation",
        "Vegetation Index"
    ],
    "recommended_pages": [],
    "related": [],
    "sources": [],
    "products": [],
    "newer_versions": [],
    "older_versions": [],
    "alternate_versions": []
}