{
    "id": 2176,
    "url": "https://svs.gsfc.nasa.gov/2176/",
    "page_type": "Visualization",
    "title": "Impervious Surface Cover: Paved Areas in DC and Baltimore",
    "description": "A special algorithm has been applied to the Landsat 7 image to illuminate the changes in low-density residential land use which exemplify sprawl.There is a link between impervious surfaces within a watershed, (here we see a subset of the Chesapeake Bay watershed area) and the water quality within the watershed. In general, once 10-15 % of an area is covered by impervious surfaces, increased sediments and chemical pollutants in runoff have a measurable effect on water quality. When 15-25% of a watershed is paved or impervious to drainage, increased runoff leads to reduced oxygen levels and impaired stream life. When more then 25% of surfaces are paved, many types of stream life die from the concentrated runoff and sediments. || ",
    "release_date": "2001-06-12T12:00:00-04:00",
    "update_date": "2023-05-03T13:58:03.006130-04:00",
    "main_image": {
        "id": 532375,
        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176_pre.jpg",
        "filename": "a002176_pre.jpg",
        "media_type": "Image",
        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
        "width": 320,
        "height": 266,
        "pixels": 85120
    },
    "main_video": {
        "id": 532380,
        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176.webmhd.webm",
        "filename": "a002176.webmhd.webm",
        "media_type": "Movie",
        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
        "width": 960,
        "height": 540,
        "pixels": 518400
    },
    "main_credits": {
        "Visualizations by": [
            {
                "name": "Stuart A. Snodgrass",
                "employer": "Global Science and Technology, Inc."
            }
        ]
    },
    "progress": "Complete",
    "media_groups": [
        {
            "id": 364348,
            "url": "https://svs.gsfc.nasa.gov/2176/#media_group_364348",
            "widget": "Basic text with HTML",
            "title": "",
            "caption": "",
            "description": "A special algorithm has been applied to the Landsat 7 image to illuminate the changes in low-density residential land use which exemplify sprawl.<br>There is a link between impervious surfaces within a watershed, (here we see a subset of the Chesapeake Bay watershed area) and the water quality within the watershed. In general, once 10-15 % of an area is covered by impervious surfaces, increased sediments and chemical pollutants in runoff have a measurable effect on water quality. When 15-25% of a watershed is paved or impervious to drainage, increased runoff leads to reduced oxygen levels and impaired stream life. When more then 25% of surfaces are paved, many types of stream life die from the concentrated runoff and sediments.",
            "items": [],
            "extra_data": {}
        },
        {
            "id": 364349,
            "url": "https://svs.gsfc.nasa.gov/2176/#media_group_364349",
            "widget": "Video player",
            "title": "",
            "caption": "",
            "description": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
            "items": [
                {
                    "id": 377577,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532378,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176.00005_print.png",
                        "filename": "a002176.00005_print.png",
                        "media_type": "Image",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 720,
                        "height": 480,
                        "pixels": 345600
                    }
                },
                {
                    "id": 377572,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532374,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176_thm.png",
                        "filename": "a002176_thm.png",
                        "media_type": "Image",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 80,
                        "height": 40,
                        "pixels": 3200
                    }
                },
                {
                    "id": 377573,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532375,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176_pre.jpg",
                        "filename": "a002176_pre.jpg",
                        "media_type": "Image",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 320,
                        "height": 266,
                        "pixels": 85120
                    }
                },
                {
                    "id": 377578,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532379,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176_pre_searchweb.jpg",
                        "filename": "a002176_pre_searchweb.jpg",
                        "media_type": "Image",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 320,
                        "height": 180,
                        "pixels": 57600
                    }
                },
                {
                    "id": 377576,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532380,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176.webmhd.webm",
                        "filename": "a002176.webmhd.webm",
                        "media_type": "Movie",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 960,
                        "height": 540,
                        "pixels": 518400
                    }
                },
                {
                    "id": 377574,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532376,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176.dv",
                        "filename": "a002176.dv",
                        "media_type": "Movie",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 720,
                        "height": 480,
                        "pixels": 345600
                    }
                },
                {
                    "id": 377575,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532377,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176.mp4",
                        "filename": "a002176.mp4",
                        "media_type": "Movie",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 640,
                        "height": 480,
                        "pixels": 307200
                    }
                },
                {
                    "id": 377571,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532373,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/a002176.mpg",
                        "filename": "a002176.mpg",
                        "media_type": "Movie",
                        "alt_text": "In this animation the green is taken away to let the Impervious Surface\nCover stand out.",
                        "width": 320,
                        "height": 240,
                        "pixels": 76800
                    }
                }
            ],
            "extra_data": {}
        },
        {
            "id": 364350,
            "url": "https://svs.gsfc.nasa.gov/2176/#media_group_364350",
            "widget": "Single image",
            "title": "",
            "caption": "",
            "description": "A hi-res still of the Impervious Surface Cover DC and Baltimore and surrounding area.",
            "items": [
                {
                    "id": 377581,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532383,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/impervious.jpg",
                        "filename": "impervious.jpg",
                        "media_type": "Image",
                        "alt_text": "A hi-res still of the Impervious Surface Cover DC and Baltimore and surrounding area.",
                        "width": 2880,
                        "height": 1944,
                        "pixels": 5598720
                    }
                },
                {
                    "id": 377580,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532382,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/impervious_web.jpg",
                        "filename": "impervious_web.jpg",
                        "media_type": "Image",
                        "alt_text": "A hi-res still of the Impervious Surface Cover DC and Baltimore and surrounding area.",
                        "width": 320,
                        "height": 216,
                        "pixels": 69120
                    }
                },
                {
                    "id": 377579,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532381,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/impervious.tif",
                        "filename": "impervious.tif",
                        "media_type": "Image",
                        "alt_text": "A hi-res still of the Impervious Surface Cover DC and Baltimore and surrounding area.",
                        "width": 2880,
                        "height": 1944,
                        "pixels": 5598720
                    }
                }
            ],
            "extra_data": {}
        },
        {
            "id": 364351,
            "url": "https://svs.gsfc.nasa.gov/2176/#media_group_364351",
            "widget": "Single image",
            "title": "",
            "caption": "",
            "description": "A hi-res still of just the Impervious Surface Cover DC and Baltimore.",
            "items": [
                {
                    "id": 377584,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532386,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/impervious_paved.jpg",
                        "filename": "impervious_paved.jpg",
                        "media_type": "Image",
                        "alt_text": "A hi-res still of just the Impervious Surface Cover DC and Baltimore.",
                        "width": 2880,
                        "height": 1944,
                        "pixels": 5598720
                    }
                },
                {
                    "id": 377583,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532385,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/impervious_paved_web.jpg",
                        "filename": "impervious_paved_web.jpg",
                        "media_type": "Image",
                        "alt_text": "A hi-res still of just the Impervious Surface Cover DC and Baltimore.",
                        "width": 320,
                        "height": 216,
                        "pixels": 69120
                    }
                },
                {
                    "id": 377582,
                    "type": "media",
                    "extra_data": null,
                    "title": null,
                    "caption": null,
                    "instance": {
                        "id": 532384,
                        "url": "https://svs.gsfc.nasa.gov/vis/a000000/a002100/a002176/impervious_paved.tif",
                        "filename": "impervious_paved.tif",
                        "media_type": "Image",
                        "alt_text": "A hi-res still of just the Impervious Surface Cover DC and Baltimore.",
                        "width": 2880,
                        "height": 1944,
                        "pixels": 5598720
                    }
                }
            ],
            "extra_data": {}
        },
        {
            "id": 364352,
            "url": "https://svs.gsfc.nasa.gov/2176/#media_group_364352",
            "widget": "Basic text",
            "title": "For More Information",
            "caption": "",
            "description": "See [Landsat](https://landsat.gsfc.nasa.gov/monitoring-urban-growth/)",
            "items": [],
            "extra_data": {}
        }
    ],
    "studio": "svs",
    "funding_sources": [
        "ESE Informal Education"
    ],
    "credits": [
        {
            "role": "Animator",
            "people": [
                {
                    "name": "Stuart A. Snodgrass",
                    "employer": "Global Science and Technology, Inc."
                }
            ]
        },
        {
            "role": "Scientist",
            "people": [
                {
                    "name": "Andrew Smith",
                    "employer": "University of Maryland"
                }
            ]
        }
    ],
    "missions": [
        "Landsat"
    ],
    "series": [
        "Urban Surface Cover"
    ],
    "tapes": [],
    "papers": [],
    "datasets": [
        {
            "name": "Impervious Surface Cover",
            "common_name": "",
            "platform": "Landsat-7",
            "sensor": "ETM+",
            "type": "Other",
            "organizations": [],
            "description": "",
            "credit": "",
            "url": "http://landsat.gsfc.nasa.gov/about/wrs.html",
            "date_range": "1998/03/27"
        }
    ],
    "nasa_science_categories": [
        "Earth"
    ],
    "keywords": [
        "Baltimore",
        "Earth Science",
        "Ecology",
        "Environmental science",
        "Habitat Conversion/fragmentation",
        "Human Dimensions",
        "Human geography",
        "Urbanization/urban Sprawl",
        "Washington DC",
        "Watershed"
    ],
    "recommended_pages": [],
    "related": [],
    "sources": [],
    "products": [],
    "newer_versions": [],
    "older_versions": [],
    "alternate_versions": []
}