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What is the projection of the data?

April 26, 2017Data projection

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What is the projection of the data?

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All the data use the geographic projection of decimal degrees, with the exception of Digital Raster Graphics (DRGs) and Digital OrthoPhoto Quarter Quads (DOQQs). UTM is the common projection of the DRGs, but the datum varies between NAD27 and NAD83, and the Zone changes from 13 to 12 at -108 degrees. The DOQQs are in UTM, NAD83, Zone 13 and 12. Some are black and white and some are color. If you need to display 2 or more images together and they are in different zones or datums, some of the images will need to be reprojected. RGIS can do this for a fee or images in the desired format can be ordered from USGS.