DOQ = USGS Digital Orthophoto Quadrangle: 1975 - 2005 -

Metadata Updated: November 12, 2020

Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquadrangle (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-quadrangle plus the overage ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The overage 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 radiometric image brightness values are stored as 256 gray levels, ranging from 0 to 255. The standard, uncompressed gray scale DOQ format contains an ASCII header followed by a series of 8-bit image data lines. The keyword-based, ASCII header may vary in the number of data entries. The header is affixed to the beginning of the image and is composed of strings of 80 characters with an asterisk (*) as character 79 and an invisible newline character as character 80. Each keyword string contains information for either identification, display, or registration of the image. Additional strings of blanks are added to the header so that the length of a header line equals the number of bytes in a line of image data. The header line will be equal in length to the length of an image line. If the sum of the byte count of the header is less than the sample count of one DOQ image line, then the remainder of the header is padded with the requisite number of 80 character blank entries, each terminated with an asterisk and newline character.

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date July 9, 2020
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) July 9, 2020 (publication)
Frequency Of Update SPORADIC

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date July 9, 2020
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) July 9, 2020 (publication)
Responsible Party U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center (Point of Contact)
Contact Email
Access Constraints Use Constraints: There is no guarantee of warranty concerning the accuracy of these data. Users should not use these data for critical applications without a full awareness of their limitations. Temporal changes may have occurred since the data were collected and some parts of these data may no longer represent actual surface conditions. There are no restrictions regarding the use of data distributed by the U.S. Geological Survey (USGS), unless expressly identified prior to or at the time of receipt. We request the following statement be used: Data available from the U.S. Geological Survey. Please refer to for more information on data citation., Access Constraints: Downloading and using these data signifies that the user comprehends and will comply with the USGS Privacy Policy. Reading and understanding all portions of the metadata will protect the interests of both the user and the USGS. Please refer to
Bbox East Long -65.2
Bbox North Lat 71.5
Bbox South Lat 17.9
Bbox West Long -158.4
Coupled Resource
Frequency Of Update SPORADIC
Licence Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty.
Metadata Language
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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