Digital Orthophoto Quadrangles (doqq_b&w_hydepark_sw)
Earth Science Information Center, U.S. Geological Survey. Digital Orthophoto Quadrangles (doqq_b&w_hydepark_sw). U.S. Geological Survey
Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a 1-meter ground resolution, quarter-quadrangle (3.75-minutes of latitude by 3.75-minutes of longitude) image cast on the Universal Transverse Mercator Projection (UTM) on the North American Datum of 1983 (NAD83).The geographic extent of the DOQ is equivalent to a quarter-quad plus The overedge ranges a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The overedge is included to facilitate tonal matching for mosaicking and for the placement of the NAD83 and secondary datum corner ticks. The normal orientation of data is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of the lines from north to south. The standard, archived digital orthophoto is formatted as four ASCII header records, followed by a series of 8-bit binary image data records. The radiometric image brightness values are stored as 256 gray levels ranging from 0 to 255.
- Type
- Geospatial Dataset
- Authors
- Earth Science Information Center, U.S. Geological Survey
- Publisher
- U.S. Geological Survey
- Units
- ROVA
- Keywords
- 1-Meter Orthophoto, 2-meter orhtophoto, 3.75- x 3.75-minute orthophoto, 7.5- x 7.5-minute orthophoto, Aerial Photograph, Digital Image Map, Digital Orthophoto, digital orthophotoquad, DOQ, DOQQ, Orthophoto, quarter-quadrangle orthophoto, Rectified Image, Rectified Photograph, SAGA, Saint-Gaudens NHS