The National Map Seamless Server, Earth Resources Observation and Science (EROS)
1 Meter Digital Orthoimagery Quarter Quadrangles (DOQQ) FAQ
Q. What is the 1 Meter Digital Orthoimagery Quarter Quadrangles (DOQQ) A. 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. The DOQ combines the image characteristics of the original photograph with the georeferenced qualities of a map.DOQQs are black and white (B/W), natural color, or color-infrared (CIR) images with 1-meter ground resolution. The source data is the original USGS DOQQ's, but have been made available as a seamless product. There is a limited area for the initial release. As more data is loaded, they will be incorporated into the seamless system Q.What are the specifications of the 1 Meter Digital Orthoimagery Quarter Quadrangles (DOQQ) A.
Q. What formats are available A. TIFF is a GeoTiff (.tif and .tfw files included)Q. What is the coverage area A. All current 1 meter DOQs for the United States and portions of Alaska. To see the areas of coverage by 1 meter DOQQ:
Q. When will more 1 meter DOQQ data become available A. All of the current (as of June 2005) have been loaded to the seamless database. The next process will be to update the database with new updates of DOQs. Due to the size of DOQQ database, this will take some time. The best way to see availability is to check the index every month to see new coverage areas and check the metadata for the source date of the DOQs.Q. Can I get the images compressed A. The images are only available as full resolution and not available as compressed files.Q. If I don't want the seamless 1 meter DOQQ's, where can I get the tiled DOQQ's A. The tiled DOQQ's, 3.75 min quarter quads, are searchable and orderable from EarthExplorer.Q. Are historical 1 meter DOQQ's available through The National Map Seamless Server A. The most current 1 meter DOQQ's will be available through The National Map Seamless Server, the historical will not be. The historical 1 meter DOQQ's, if available, can be searched and ordered from EarthExplorer.Q. Where can the status of loads to The National Map Seamless Server and metadata be found A. There is an Orthoimagery website that provides links to interactive maps for coverage area and an Orthoimagery Data Source Index. http://gisdata.usgs.gov/website/orthoimageryQ. Where can more information be found about 1 meter DOQQ's A. The following websites provide more information about 1 meter DOQQ's: |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://seamless.usgs.gov/faq/1mdoqq_faq.php
Page Contact Information: webmapping@usgs.gov
Page Last Modified: November 22, 2007
