How often is orthoimagery in The National Map updated and what are the acquisition dates?
Orthoimagery (georectified aerial photography) available through The National Map Downloader and The National Map Services is from the USDA Farm Service Agency's National Agricultural Imagery Program (NAIP), which is 1-meter resolution. Generally, NAIP imagery is refreshed on a 3-year cycle with approximately one third of the continental U.S. flown each year.
The month and year of imagery acquisition can be found in the "Info/Metadata" links in the product search. The acquisition date is also part of the file name.
Learn more: USGS National Geospatial Program Imagery
Related
How can I bulk download USGS Earth Resources Observation and Science (EROS) products? How can I bulk download USGS Earth Resources Observation and Science (EROS) products?
The Bulk Download Web Application (BDWA ) lets users download large amounts of satellite, aerial imagery and other geospatial data. A video " Using the EarthExplorer BDWA," explains how to add scenes through EarthExplorer and retrieve them with minimal user interaction. An April 2023 webinar, " The New and Improved Bulk Download Web Application," also provides an overview of the tool. To receive...
How do I download orthoimagery products and what are the available formats? 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? 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 is a digital orthophoto quadrangle (DOQ) or orthoimage? 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...
How much area does an aerial photograph cover? 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...
Are the scanned aerial photographic images georectified? 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...
Related
How can I bulk download USGS Earth Resources Observation and Science (EROS) products? How can I bulk download USGS Earth Resources Observation and Science (EROS) products?
The Bulk Download Web Application (BDWA ) lets users download large amounts of satellite, aerial imagery and other geospatial data. A video " Using the EarthExplorer BDWA," explains how to add scenes through EarthExplorer and retrieve them with minimal user interaction. An April 2023 webinar, " The New and Improved Bulk Download Web Application," also provides an overview of the tool. To receive...
How do I download orthoimagery products and what are the available formats? 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? 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 is a digital orthophoto quadrangle (DOQ) or orthoimage? 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...
How much area does an aerial photograph cover? 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...
Are the scanned aerial photographic images georectified? 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...