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# How To Obtain Aerial Photographs

### Fact Sheet 081-99 (April 1999)

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The U.S. Geological Survey (USGS)  maintains an informational database of aerial photographic coverage of the United States and its territories that dates back to the1940's.

This information describes photographic projects from the USGS, other Federal, State, andlocal government agencies, and commercial firms.

The pictures on this page show a part of a standard 9- by9-inch photograph and the results obtained by enlarging the original photograph two and four times. Compare the size of theQualcomm Stadium, Jack Murphy Field, in San Diego, Calif, and the adjacent parking lot and freewaysshown at the different scales.

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| In this 4X (36 x 36 inch) enlargement of the same photograph, at a scaleof 1:10,000, 1 inch on the photograph represents 833 feet on the ground. |

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| In this 2X (18 x 18 inch) enlargement of the same photograph, at ascale of 1:20,000, 1 inch on the photograph represents 1,666 feet on the ground.

In this part of the original 9 x 9 inch photograph, at a scale of 1:40,000,1 inch on the photograph represents 3,333 feet on the ground. The original photograph is fromNAPPW Roll 6860, Frame 59.

USGS Earth Science Information Center (ESIC) representatives will assist you in locating and ordering photographs. Please submit the completed checklistand a marked map showing your area of interest to any ESIC.

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For information on these and other USGS products and services, call 1-888-ASK-USGS,  orvisit the general interest publications Web site on mapping, geography, and related topics at  erg.usgs.gov/isb/pubs/pubslists/.

Please visit the USGS home page at www.usgs.gov.

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*This document has undergone official review and approval for publications established by theNational Mapping Division, U.S. Geological Survey. Some figures, have been modified or addedto improve the scientific visualization of information.*

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