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Framework Themes

There are seven National Spatial Data Infrastructure (NSDI) framework themes:

Cadastral – describes the geographic extent of past, current, and future right, title, and interest in real property

Digital Ortho-Imagery – geo-referenced images of the earth's surface, collected by a sensor

Elevation (terrestrial) – geo-referenced digital representations of terrestrial surfaces, natural or manmade, which describe vertical position above or below a datum surface

Elevation (bathymetric) – information collected to ensure that Federal navigation channels are maintained to their authorized depths

Geodetic Control – common reference system for establishing coordinates for all geographic data

Governmental Units – describe, by a consistent set of rules and semantic definitions, the official boundary of Federal, state, local, and Tribal governments.

Hydrography – surface water features such as lakes, ponds, streams and rivers, canals, oceans, and coastlines

Transportation – data used to model the geographic locations, interconnectedness, and characteristics of the transportation system within the United States