USGS 1990's National Aerial Photography Program (NAPP) Imagery
© 2024 Boyd Ostroff
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Originally published:
December 31, 2023
Most recent update:
November 21, 2024
Resolution:
4 feet (1.2 meters)
Map Tiles:
4,600,000
Size:
28 gb
Data Sources
New Jersey USGS 1995-97 Digital Orthophoto Quadrangles (color infrared)Description
Aerial imagery of the US Mid-Atlantic region from 1990-1999, stitched together into a seamless map. This is a work-in-progress and coverage will be expanded to a larger area in the future. Coverage and acquisition dates are shown below.
Most of the imagery was originally acquired by the USGS National Aerial Photography program (NAPP), although Rhode Island was acquired by the Department of Transportation and Massachussetts imagery was also produced by the state. The National Aerial Photography Program operated from 1987 to 2007 and acquired over 1.3 million images with both monochrome and color infrared film photography at an altitude of 20,000 feet. The original photographs covered one quarter of a USGS 7.5 minute quadrangle and were called Digital Orthophoto Quarter Quadrangles, or DOQQ's.
About half of the original imagery was shot in color infrared, but the entire map was processed as 8-bit grayscale for consistency. Most of the original imagery had one-meter resolution, but that was lowered a bit by re-projecting to the Web Mercator standard. The maximum resolution of this map is 4 feet (1.2 meters) which is sufficient to capture all the detail in the original aerial photographs.
Note that this map replaces a previous version of the 1995 aerials that only covered the Southern New Jersey region.
More about the USGS National Aerial Photography Program
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