Item talk:Q242453
From geokb
{
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Natural-color images depict the surface as seen by the human eye. The calibration of the Landsat ETM+ maps produced by Davis (2006) are relative reflectance and need to be grounded with ground-reflectance data, but the difficulties in performing fieldwork in Afghanistan precluded ground-reflectance surveys. For natural color calibration, which involves only the blue, green, and red color bands of Landsat, we could use ground photographs, Munsell color readings of ground surfaces, or another image base that accurately depicts the surface color. \r\n\r\nEach map quadrangle is 1? of latitude by? of longitude. The numbers assigned to each map quadrangle refer to the latitude and longitude coordinates of the lower left corner of the quadrangle. For example, quadrangle Q2960 has its lower left corner at lat 29? N., long 60? E. Each quadrangle overlaps adjacent quadrangles by 100 pixels (2.85 km). Only the 14.25-m-spacial-resolution UTM and 28.5-m-spacial-resolution WGS84 geographic geotiff datasets are available in this report to decrease the amount of space needed. \r\n\r\nThe images are (three-band, eight-bit) geotiffs with embedded georeferencing. As such, most software will not require the associated world files. An index of all available images in geographic is displayed here: Index_Geo_DD.pdf. The country of Afghanistan spans three UTM zones: (41-43). Maps are stored as geoTIFFs in their respective UTM zone projection. Indexes of all available topographic map sheets in their respective UTM zone are displayed here: Index_UTM_Z41.pdf, Index_UTM_Z42.pdf, Index_UTM_Z43.pdf. You will need Adobe Reader to view the PDF files. Download a copy of the latest version of Adobe Reader for free.", "description": "10 p.; maps and data files; 3 DVD-ROMs", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey" }, "author": [ { "@type": "Person", "name": "Hare, Trent M. thare@usgs.gov", "givenName": "Trent M.", "familyName": "Hare", "email": "thare@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-8842-389X", "url": "https://orcid.org/0000-0001-8842-389X" }, "affiliation": [ { "@type": "Organization", "name": "Astrogeology Science Center", "url": "https://www.usgs.gov/centers/astrogeology-science-center" } ] }, { "@type": "Person", "name": "Davis, Philip A. pdavis@usgs.gov", "givenName": "Philip A.", "familyName": "Davis", "email": "pdavis@usgs.gov" } ], "funder": [ { "@type": "Organization", "name": "Astrogeology Science Center", "url": "https://www.usgs.gov/centers/astrogeology-science-center" } ], "spatialCoverage": [ { "@type": "Place", "geo": [ { "@type": "GeoShape", "additionalProperty": { "@type": "PropertyValue", "name": "GeoJSON", "value": { "type": "FeatureCollection", "features": [ { "type": "Feature", "properties": {}, "geometry": { "type": "Polygon", "coordinates": [ [ [ 60, 29 ], [ 60, 39 ], [ 75, 39 ], [ 75, 29 ], [ 60, 29 ] ] ] } } ] } } }, { "@type": "GeoCoordinates", "latitude": 34.0, "longitude": 67.5 } ] } ] }, "OpenAlex": { "abstract_inverted_index": null, "apc_list": null, "apc_paid": null, "authorships": [ { "author_position": "first", "author": { "id": "https://openalex.org/A5103517623", "display_name": "Philip A. 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