USGS Frequently Asked Questions

FAQ's about Geospatial Data

How large is the NAD 27 to NAD 83 shift?

How can I view USGS digital raster graphics (DRGs)?

What is a digital raster graphic (DRG)?

How can I determine the UTM zone of my digital orthophoto quadrangle (DOQ)?

How can I clip the map collar off my digital raster graphic (DRG)?

What are digital elevation models (DEMs)?

What is a digital orthophoto quadrangle (DOQ)?

What are the formats for digital raster graphics (DRGs)?

How can I view a USGS digital orthophoto quadrangle (DOQ)?

What is the resolution of a digital raster graphic (DRG)?

Where do I find the number of rows and columns in a digital raster graphic (DRG)?

What is digital line graph (DLG) data?

How does USGS produce a digital orthophoto quadrangle (DOQ)?

How do I get files off the county digital orthophoto quadrangle (DOQ) CD-ROM?

What is the resolution of a digital orthophoto quadrangle (DOQ)?

I downloaded 1:100,000-scale Digital Line Graph (DLG) files from the USGS web site and can't read them into Arc.

What are the formats of digital orthophoto quadrangles (DOQs)?

How can I reproject USGS data?

What is a Spatial Data Transfer Standard (SDTS) Transfer?

What is SDTS?

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