USGS (U.S. Geological Survey) EROS, Sioux Falls, SD

National High Altitude Photography (NHAP)

Contents:

Product Description
Digital File Sizes & Prices
Search & Order

Color-infrared NHAP photo
(San Francisco, CA)

Black and white NHAP photo
(San Francisco, CA)

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Product Description

The National High Altitude Photography (NHAP) program was in operation from 1980 to 1989. It was coordinated by the USGS to acquire aerial photography of the 48 conterminous states on a 5–7 year repeat cycle.

NHAP photography was acquired from an altitude of 40,000 feet. Two different camera systems were used to acquire simultaneous coverage at two different scales. A 6-inch focal length lens acquired black-and-white (B/W) film at an approximate scale of 1:80,000. B/W photos cover a ground area of 11 x 11 miles. An 8.25-inch lens acquired color-infrared (CIR) film at an approximate scale of 1:58,000. CIR photos cover a ground area of 8 x 8 miles.

Additional Information:

Digital File Sizes & Prices

High Resolution Scanned - $30.00 per frame

High Resolution Scanned Product
Film Size	Micron Size	Black and white (B/W)	Color-infrared (CIR)
9 x 9 in	21 Micron (1200 dpi) *	117 MB	350 MB
	14 Micron (1800 dpi)	262 MB	787 MB
	7 Micron (3600 dpi)	1.3 GB	Not Available**

* Denotes the recommended micron size.

** Color/CIR film source is not available at a 7 micron spot size because the file size is too large and there are no advantages below the 14 micron spot size.

The above sizes may vary due to scanning more than just image data. The files are created in TIFF format. With our procedure of scanning the surrounding metadata and adding the USGS logo, the actual image size will generally be larger than the estimates above.

NHAP Medium Resolution Digitized : Downloadable at no cost

The file sizes are about 15 megabytes for black-and-white images and 40 megabytes for color images. The files are stored in TIFF format. The medium-resolution files are created at about 400 dpi.

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High Resolution Scanned:

All NHAP photography can be searched and ordered on EarthExplorer, GloVis, and PhotoFinder (a "quick and easy" search and order tool devoted solely to NAPP photos).

Medium Resolution Digitized:

All of the NHAP and NAPP images have been digitized. Products can be ordered on EarthExplorer or GloVis. All NHAP medium resolution digitized images are downloadable at no cost.

Other sources for searching and ordering:

NHAP photography may also be ordered through the USDA Aerial Photography Field Office (APFO)

Businesses that can provide printed images from USGS digital data.

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://eros.usgs.gov/ Page Contact Information: custserv@usgs.gov Page Last Modified: August 22, 2006