USGS Frequently Asked Questions

FAQ's about Digital Aerial Photographs

Can I view topographic maps and aerial photographs online?

What is a digital orthophoto quadrangle (DOQ)?

What does Dots Per Inch (DPI) and Pixels Per Inch (PPI) mean?

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

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)?

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

How much area does an aerial photograph cover?

When was NAPP/NHAP photography acquired?

Is there a schedule to digitize the aerial photo archive?

Will Corona imagery be digitized?

Are the scanned aerial photograhic images georectified?

Will all aerial photographic film held by USGS be digitized?

Is stereo pair coverage available with scanned aerial photographic products?

How many high resolution scanned aerial photographic images will fit on a CD-ROM or DVD?

What software can I use to view scanned and digitized images?

What will happen to the film containing aerial photographs once it’s been digitized?

Will certification be available for scanned aerial photographic products?

What is the process by which digital aerial photograhs can be ordered?

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