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 onto which other map information is overlaid. It is possible to measure directly on an orthoimage, just like other maps.
Learn more:
- Digital Orthophoto Quadrangle (DOQ)
- High Resolution Orthoimagery (HRO)
- National Agriculture Imagery Program (NAIP, NAIP Plus)
Related
How can I download orthoimagery in bulk?
Download orthoimagery in bulk through a Bulk Download Application (BDA). Free registration is required. Start by clicking on the Help link in EarthExplorer and selecting the Bulk Download Tutorial . To receive bulk data via external hard drive, you must supply the hard drive(s) within our specifications, pay for shipping the drive(s), and provide a paid return label or a carrier account number...
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. EarthExplorer : Products Overview Format varies by type of orthoimagery: Native format, Georeferenced Tagged Image File Format (GeoTIFF), or compressed 10:1 JPEG2000 A NAIP orthoimage is included as an optional layer in the PDF format of digital...
Why does my orthoimagery search on The National Map return multiple tiles for downloading?
Orthoimagery is usually very large in file size, so we stage the data in "tiles" that can be reasonably transported over the Internet. Orthoimagery from the National Agriculture Imagery Program (NAIP) that is distributed via The National Map Data Download is in compressed 10:1, JPEG2000 format in 3.75 minute x 3.75 minute tile extents. A larger catalog of orthoimagery can also be downloaded using...
What are the URLs for imagery services in The National Map, and are they cached or dynamic?
There are several imagery services for The National Map . Some imagery services are cached and some are dynamic: USGSImageryOnly (under Base Maps), for example, is a tile cache base map service of orthoimagery. It has different imagery data sources depending on view scale. The USGSImageryOnly service uses cache tiles of 256x256 pixels in size and 96 dots per inch (dpi) resolution with 75%...
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...
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...
Digital orthoimagery base specification V1.0
The National Map - Orthoimagery
USGS GeoData Digital Orthophoto Quadrangles
Related
How can I download orthoimagery in bulk?
Download orthoimagery in bulk through a Bulk Download Application (BDA). Free registration is required. Start by clicking on the Help link in EarthExplorer and selecting the Bulk Download Tutorial . To receive bulk data via external hard drive, you must supply the hard drive(s) within our specifications, pay for shipping the drive(s), and provide a paid return label or a carrier account number...
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. EarthExplorer : Products Overview Format varies by type of orthoimagery: Native format, Georeferenced Tagged Image File Format (GeoTIFF), or compressed 10:1 JPEG2000 A NAIP orthoimage is included as an optional layer in the PDF format of digital...
Why does my orthoimagery search on The National Map return multiple tiles for downloading?
Orthoimagery is usually very large in file size, so we stage the data in "tiles" that can be reasonably transported over the Internet. Orthoimagery from the National Agriculture Imagery Program (NAIP) that is distributed via The National Map Data Download is in compressed 10:1, JPEG2000 format in 3.75 minute x 3.75 minute tile extents. A larger catalog of orthoimagery can also be downloaded using...
What are the URLs for imagery services in The National Map, and are they cached or dynamic?
There are several imagery services for The National Map . Some imagery services are cached and some are dynamic: USGSImageryOnly (under Base Maps), for example, is a tile cache base map service of orthoimagery. It has different imagery data sources depending on view scale. The USGSImageryOnly service uses cache tiles of 256x256 pixels in size and 96 dots per inch (dpi) resolution with 75%...
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...
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...