A Digital Orthophoto Quadrangle (DOQ) is a computer-generated image of an aerial photograph in which the image displacement caused by terrain relief and camera tilt has been removed. Unlike an aerial photograph, an orthoimage has a uniform scale, so it can be used as a base map onto which other map information is overlaid. It is possible to measure directly on an orthoimage, just like other maps. The USGS produces two types of DOQs: 7.5-minute (full-quad) DOQs that cover an area measuring 7.5-minutes longitude by 7.5-minutes latitude and a 3.75-minute (quarter-quad) DOQs that cover an area measuring 3.75-minutes longitude by 3.75-minutes latitude. The DOQ combines the image characteristics of the original photograph with the georeferenced qualities of a map. The DOQQ mosaics produced by IDWR are black and white (B/W) images with 1-meter ground resolution. A DOQ can be incorporated into any geographic information system (GIS) that can manipulate raster images. It can function as a cartographic base for displaying, generating, and modifying associated digital planimetric data.
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{'Title': 'Doqq', 'Author': 'Margie.Wilkins@idwr.idaho.gov', 'Comments': 'A Digital Orthophoto Quadrangle (DOQ) is a computer-generated image of an aerial photograph in which the image displacement caused by terrain relief and camera tilt has been removed. Unlike an aerial photograph, an orthoimage has a uniform scale, so it can be used as a base map onto which other map information is overlaid. It is possible to measure directly on an orthoimage, just like other maps. The USGS produces two types of DOQs: 7.5-minute (full-quad) DOQs that cover an area measuring 7.5-minutes longitude by 7.5-minutes latitude and a 3.75-minute (quarter-quad) DOQs that cover an area measuring 3.75-minutes longitude by 3.75-minutes latitude. The DOQ combines the image characteristics of the original photograph with the georeferenced qualities of a map. The DOQQ mosaics produced by IDWR are black and white (B/W) images with 1-meter ground resolution. A DOQ can be incorporated into any geographic information system (GIS) that can manipulate raster images. It can function as a cartographic base for displaying, generating, and modifying associated digital planimetric data.', 'Subject': 'Black and white, 3.75-minute (quarter-quad) DOQQs mosaicked by IDWR that function as a cartographic base to display digital planimetric data in a GIS.', 'Category': '', 'AntialiasingMode': 'None', 'TextAntialiasingMode': 'Force', 'Keywords': 'DOQ,DOQQ,digital orthophoto,digital orthophotoquad,digital image map,aerial photograph,orthophoto,quarter-quadrangle orthophoto,1-meter orthophoto,3.75- x 3.75-minute orthophoto,background,DRG,IDWR,NAIP'}
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