O'Reilly logo

Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition by Michael D. Kennedy

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Looking for Data on the Internet

The fact that suitable spatial datasets are hard to find, and that a major impediment to sharing datasets is simply knowing of their existence, the U.S. government undertook two distinct but related efforts in the 1990s: the Federal Geographic Data Committee (FGDC), set up by an Executive Order (12906) from the President, and the National Spatial Data Infrastructure (NSDI).

The FGDC (www.fgdc.gov) is a governmental interagency committee composed of representatives from the Executive office of the President, Cabinet-level, and independent agencies. The FGDC is developing the NSDI (www.fgdc.gov/nsdi). Cooperating in the effort are state, local, and tribal governments, the academic community, and the private sector. The NSDI encompasses policies, standards, and procedures for organizations to cooperatively produce and share geographic data. The FGDC also sponsors the National Geospatial Data Clearinghouse to provide a mechanism for searches for geographic data.

At the same time, various governmental agencies (federal, state, regional, and local) are developing spatial datasets, which may or may not be accessible, and which may or may not be free to the public. For example, the U.S. Geological Survey (www.usgs.gov) has amassed large and varied datasets, dealing not just with geology, but elevation, hydrography, land cover, and other themes. USGS produced the Digital Raster Graphic (DRG) quadrangles that you saw in Chapter 2. Also, the Census Bureau ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required