Lesson 5: Using The National Map Web Services in ArcMap - This video provides an overview and demonstrates how to use The National Map's web services in a mapping application.
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:
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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% compression quality.
- NAIP Plus (under Theme Overlays) is an example of a dynamic map service. It includes 1-meter resolution data from the National Agriculture Imagery Program (NAIP).
Learn more: Video lessons for using The National Map Products and Services
Related
What is the difference between tiled and dynamic services?
A tiled service contains cached tiles that render the map in small tile images. This allows the map to perform much faster when panning and zooming, compared to a dynamic service. Dynamic is considered an "older" way of displaying web maps, where each feature is called from the source data and drawn separately for every pan and zoom. Tiled base maps are cached from global scale to a scale of 1:9...
What sources were used for imagery in The National Map services?
Sources for orthoimagery in The National Map services : World view to 1:2,300,000 - NASA Blue Marble Next Generation (BMNG) 1:1,150,000 to 1:289,000 - A subset of the Global Land Survey 2000 (Landsat) Scales larger than 1:289,000 - primarily the National Agriculture Imagery Program (NAIP). The data is 1-meter pixel resolution flown during "leaf-on" conditions. Collection of NAIP imagery is...
What projection are the imagery services in The National Map viewer?
Imagery services in The National Map (TNM) use WGS 1984 Web Mercator (Auxiliary Sphere). The USGS ImageryOnly Service (under Base Maps) is cached (pre-generated) at this projection. Imagery services can be easily reprojected to many other popular projections for use in GIS desktop applications as background services. Learn more: Training videos for using The National Map Products and Services
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 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...
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...
Related
What is the difference between tiled and dynamic services?
A tiled service contains cached tiles that render the map in small tile images. This allows the map to perform much faster when panning and zooming, compared to a dynamic service. Dynamic is considered an "older" way of displaying web maps, where each feature is called from the source data and drawn separately for every pan and zoom. Tiled base maps are cached from global scale to a scale of 1:9...
What sources were used for imagery in The National Map services?
Sources for orthoimagery in The National Map services : World view to 1:2,300,000 - NASA Blue Marble Next Generation (BMNG) 1:1,150,000 to 1:289,000 - A subset of the Global Land Survey 2000 (Landsat) Scales larger than 1:289,000 - primarily the National Agriculture Imagery Program (NAIP). The data is 1-meter pixel resolution flown during "leaf-on" conditions. Collection of NAIP imagery is...
What projection are the imagery services in The National Map viewer?
Imagery services in The National Map (TNM) use WGS 1984 Web Mercator (Auxiliary Sphere). The USGS ImageryOnly Service (under Base Maps) is cached (pre-generated) at this projection. Imagery services can be easily reprojected to many other popular projections for use in GIS desktop applications as background services. Learn more: Training videos for using The National Map Products and Services
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 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...
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...