Menlo Park, California Aerial Photography and Imagery Library Collection located in the Main Pecora Federal Library on Campus. This photo collection is used by USGS personnal, and the general public. Historical photos from agencies such as Cal-trans, (California Transportation Department) and counties in California are a valuable part of the collection.
Are the scanned aerial photographic images georectified?
Scans of traditional aerial photography film products (air photos) are not georectified.
The USGS does, however, offer several orthoimagery (georectified aerial photograph) products:
- Digital Orthophoto Quadrangle (DOQ)
- High Resolution Orthoimagery (HRO)
- National Agriculture Imagery Program (NAIP, NAIP Plus)
NAIP orthoimagery has been collected for the entire conterminous United States every 3 years beginning in 2009. The USGS only serves NAIP orthoimagery. NAIP aerial photos that have NOT been georectified are available from the U.S. Department of Agriculture's Aerial Photography Field Office.
Related Content
How much area does an aerial photograph cover?
The area covered by an aerial photograph (air photo) depends on the scale of the imagery. Most air photos were taken on 9 x 9 inch film. The chart below reflects coverage for a variety of photographic scales. Scale 1 inch = feet 1 side (miles) Area (square miles) 1:12,000 1000 1.70 2.9 1:20,000 1667 2.84 8.1 1:24,000 2000 3.41 11.6 1:40,000 3333 5.68 32.3 1:58,000 4833 8.23 67.73 1:63,360 5280 9...
Is there a cost for aerial photograph products?
Download medium-resolution scans (400 dpi) of aerial photography products at no charge using EarthExplorer . We are working on high-resolution scans (25 micron or 1,000 dpi) that can also be downloaded at no charge. With over 8.4 million frames of imagery in our archive, scanning will take many years to complete, but about 80% of high-resolution scans are currently available. If you can't find a...
What do the different colors in a color-infrared aerial photograph represent?
Color-infrared (CIR) aerial photography--often called "false color" photography because it renders the scene in colors not normally seen by the human eye--is widely used for interpretation of natural resources. Atmospheric haze does not interfere with the acquisition of the image. Live vegetation is almost always associated with red tones. Very intense reds indicate dense, vigorously growing...
Will I be able to see my house in an aerial photograph? Will enlarging the image let me see more detail?
The ability to see specific items in an aerial image is mostly a function of scale and resolution. The following aerial photography products all have a resolution of 1 meter or better, so you should be able to see an object the size of a house: High Resolution Orthoimagery (HRO) National Agriculture Imagery Program (NAIP) imagery Digital Orthophoto Quadrangle (DOQ) Use EarthExplorer to search for...
What is a digital orthophoto quadrangle (DOQ) or orthoimage?
A digital orthophoto quadrangle (DOQ)--or any orthoimage--is a computer-generated image of an aerial photograph in which displacements (distortions) caused by terrain relief and camera tilts have been removed. It combines the image characteristics of a photograph with the geometric qualities of a map. Unlike an aerial photograph, an orthoimage has a uniform scale, so it can be used as a base map...
What does "georeferenced" mean?
Georeferencing means that the internal coordinate system of a digital map or aerial photo can be related to a ground system of geographic coordinates. A georeferenced digital map or image has been tied to a known Earth coordinate system, so users can determine where every point on the map or aerial photo is located on the Earth's surface. The relevant coordinate transforms are typically stored...
How do I download orthoimagery products and what are the available formats?
Download orthoimagery (georectified aerial photographs) using EarthExplorer , which has the full catalog of USGS orthoimagery and aerial photography, or The National Map downloader, which has NAIP orthoimagery only. EarthExplorer : Products Overview Format varies by type of orthoimagery: Native format, Georeferenced Tagged Image File Format (GeoTIFF), or compressed 10:1 JPEG2000 The National Map...
USGS Aerial Photography and Imagery Library
Menlo Park, California Aerial Photography and Imagery Library Collection located in the Main Pecora Federal Library on Campus. This photo collection is used by USGS personnal, and the general public. Historical photos from agencies such as Cal-trans, (California Transportation Department) and counties in California are a valuable part of the collection.
Related Content
- FAQ
How much area does an aerial photograph cover?
The area covered by an aerial photograph (air photo) depends on the scale of the imagery. Most air photos were taken on 9 x 9 inch film. The chart below reflects coverage for a variety of photographic scales. Scale 1 inch = feet 1 side (miles) Area (square miles) 1:12,000 1000 1.70 2.9 1:20,000 1667 2.84 8.1 1:24,000 2000 3.41 11.6 1:40,000 3333 5.68 32.3 1:58,000 4833 8.23 67.73 1:63,360 5280 9...
Is there a cost for aerial photograph products?
Download medium-resolution scans (400 dpi) of aerial photography products at no charge using EarthExplorer . We are working on high-resolution scans (25 micron or 1,000 dpi) that can also be downloaded at no charge. With over 8.4 million frames of imagery in our archive, scanning will take many years to complete, but about 80% of high-resolution scans are currently available. If you can't find a...
What do the different colors in a color-infrared aerial photograph represent?
Color-infrared (CIR) aerial photography--often called "false color" photography because it renders the scene in colors not normally seen by the human eye--is widely used for interpretation of natural resources. Atmospheric haze does not interfere with the acquisition of the image. Live vegetation is almost always associated with red tones. Very intense reds indicate dense, vigorously growing...
Will I be able to see my house in an aerial photograph? Will enlarging the image let me see more detail?
The ability to see specific items in an aerial image is mostly a function of scale and resolution. The following aerial photography products all have a resolution of 1 meter or better, so you should be able to see an object the size of a house: High Resolution Orthoimagery (HRO) National Agriculture Imagery Program (NAIP) imagery Digital Orthophoto Quadrangle (DOQ) Use EarthExplorer to search for...
What is a digital orthophoto quadrangle (DOQ) or orthoimage?
A digital orthophoto quadrangle (DOQ)--or any orthoimage--is a computer-generated image of an aerial photograph in which displacements (distortions) caused by terrain relief and camera tilts have been removed. It combines the image characteristics of a photograph with the geometric qualities of a map. Unlike an aerial photograph, an orthoimage has a uniform scale, so it can be used as a base map...
What does "georeferenced" mean?
Georeferencing means that the internal coordinate system of a digital map or aerial photo can be related to a ground system of geographic coordinates. A georeferenced digital map or image has been tied to a known Earth coordinate system, so users can determine where every point on the map or aerial photo is located on the Earth's surface. The relevant coordinate transforms are typically stored...
How do I download orthoimagery products and what are the available formats?
Download orthoimagery (georectified aerial photographs) using EarthExplorer , which has the full catalog of USGS orthoimagery and aerial photography, or The National Map downloader, which has NAIP orthoimagery only. EarthExplorer : Products Overview Format varies by type of orthoimagery: Native format, Georeferenced Tagged Image File Format (GeoTIFF), or compressed 10:1 JPEG2000 The National Map...
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USGS Aerial Photography and Imagery Library
Menlo Park, California Aerial Photography and Imagery Library Collection located in the Main Pecora Federal Library on Campus. This photo collection is used by USGS personnal, and the general public. Historical photos from agencies such as Cal-trans, (California Transportation Department) and counties in California are a valuable part of the collection.
Menlo Park, California Aerial Photography and Imagery Library Collection located in the Main Pecora Federal Library on Campus. This photo collection is used by USGS personnal, and the general public. Historical photos from agencies such as Cal-trans, (California Transportation Department) and counties in California are a valuable part of the collection.
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