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General Listing |
Title of Listing: | | Orthophotoquads |
Category: | | Maps/Geographic Data |
Subcategory: | | US Geological Survey-USGS, All Listings |
Date: | | |
Document #: | | |
Web Site: | | http://www.fgdc.gov/FGDP/Orthophotoquads.html |
Email: | | custserv@edcmail.cr.usgs.gov |
Abstract: | |
Orthophotoquads are distortion-free aerial photographic images that are formatted as standard 7.5-minute quadrangles (15-minute in Alaska) or as quarter-quadrangles at a scale of 1:12,000.
Orthophotoquads contain no symbolized features, and a minimal number of names. Because they show a wealth of planimetric details and land use and land cover information that is not symbolized on conventional line maps, they make excellent supplements to the published maps. Pilot projects have demonstrated that digital scanning of aerial photos and rectification of scanned imagery to horizontal and vertical ground control can produce orthophoto digital data bases from which orthophotoquads at 1:12,000 and 1:24,000 were generated.
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Visit the USGS at http://edcwww.cr.usgs.gov/webglis or http://mapping.usgs.gov
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Topics
Mapping/GIS, Remote Sensing
Additional Topics/Tags/Keywords
Aerial Photography, Geographic Names, Orthophotoquads
Organization: | | US Department of the Interior (DOI), US Geological Survey (USGS) |
Address: | | Information Services
Box 25286 | Phone: | Description | Number |
City: | | Denver | | Information Services | (800) 435-7627 |
State/Province/Territory: | | CO | 2. | Earth Science Information Center | (800) 872-6277 |
Zip/Postal Code: | | 80225 | 3. | EROS Data Center | (605) 594-6151 |
Country: | | United States | 4. | Fax: | Information Services (303) 202-4693 |
Branch Locations: | |
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