Information on the structures data product and model for the National Map.
USGS generally relies on data from external sources to support its requirement for structures as a core layer in The National Map.
What are technical limitations of the structure products, such as intended usage, known limitations, and intended scale and resolution?
Structure data has generally been produced as point locations on the center of the associated structure.
Review the Download user guide at 9.0 Download and Cart.
Data is currently available in Esri File Geodatabase format (9.3.1 or 10.1) or Shapefile.
Map service metadata is available in TNM Viewer by clicking on the pull-down arrow in front of the Structures base data layer in the table of contents under Overlays.
Since structures are acquired from a variety of sources, the currentness of the data may vary by type of feature and by area of coverage.
The updates are variable. Since the USGS obtains most of this data from external sources, the frequency of updates depends on the release schedule of the source products.
Refer to the source organization and source dataset attributes for the features. Download the data and view the feature attribute table to see these values.
There is no single agency responsible for national structures data.
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