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USGS Frequently Asked Questions
FAQ's about Topographic Maps
What is the difference between plastic and paper maps?
Where do I find the number of rows and columns in a digital raster graphic (DRG)?
What are the formats for digital raster graphics (DRGs)?
What is the resolution of a digital raster graphic (DRG)?
What is a digital raster graphic (DRG)?
How can I view USGS digital raster graphics (DRGs)?
Why does the USGS charge for maps when our tax dollars were used to make them?
What is declination?
Can you send me map ordering information?
How can I find field record materials (original field notes and related material made by USGS geologists) and mapping notes?
Can anyone just drop in at USGS Information Services locations?
Can I view topographic maps and aerial photographs online?
How can I find and get historic USGS topographic maps?
What is a Topographic Map?
How much do maps cost?
How large is the North American Datum (NAD) 27 to NAD 83 shift?
How can I find survey benchmark information?
How can I find digital map data?
Do you have map data in digital form?
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U.S. Geological Survey