DOQ - Digital Orthophoto Quad
Each zip file contains:
- Four image files (.sid) - one for each quarter quad in the selected 7.5' quadrangle
- Quarter quad is designated in the filename by a suffix of a (Northeast), b (Northwest), c (Southwest), and d (Southeast)
- Associated world header files (.sdw) in NAD83 format
- Header files for both NAD83 (.n83) and NAD27 (.n27) format
- General header information file (.hd), which contains the source image date
- See a map of the dates the photos that make up the DOQs were taken
The files for download have been compressed using MrSID compression software. ESRI's ArcView software versions 3.1 and later have the capability to display MrSID files when added as image themes.
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