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USGS high resolution orthorectified images from The National Map combine the image characteristics of an aerial photograph with the geometric qualities of a map. An orthoimage is a uniform-scale image where corrections have been made for feature displacement such as building tilt and for scale variations caused by terrain relief, sensor geometry, and camera tilt. A mathematical equation based on ground control points, sensor calibration information, and a digital elevation model is applied to each pixel to rectify the image to obtain the geometric qualities of a map. A digital orthoimage may be created from several photographs mosaicked to form the final image. The source imagery may be black-and-white, natural...
Tags: Aerial Photography,
American Samoa,
Canada,
Downloadable Data,
Georeferenced, All tags...
Guam,
High Resolution Orthoimagery,
Imagery,
Mariana Islands,
Marshall Islands,
Mexico,
Micronesia,
National Standards for Spatial Digital Accuracy (NSSDA),
Orthoimagery,
Palau,
Puerto Rico,
Trusts,
U.S.,
U.S.,
US,
US,
United States,
United States,
Virgin Islands,
a-16,
digital spatial data,
image map,
imageryBaseMapsEarthCover,
natural color orthophoto,
ngda,
orthoimage,
orthophoto,
rectified image,
wwhgd, Fewer tags
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