This category contains introductory text about GIS data such as types of error in GIS datasets, types of GIS data (raster and vector), and metadata. Find resources to finding GIS data and where to download data.
The USGS will be releasing selected Landsat 7 image data of the United States through the Web (glovis.usgs.gov or earthexplorer.usgs.gov).
The Geospatial One-Stop (GOS) project encourages local governments to register and publish metadata for web mapping services on the GOS portal at www.geodata.gov. Increased availability … Read more
An article recently came out in the Washington Post (and syndicated to other newspapers around the country) lifting the veil off of one of the … Read more
A Delta 2 rocket was launched from Cape Canaveral on Saturday, February 17th.
A Tale of Two Sites: Impacts of Relocating L.A.’s Weather Station January 17, 2007 In the classic 1859 novel, “A Tale of Two Cities,” Charles … Read more
As Population Grows, So Do Urban Areas New Perspectives on Urban Land Use Change Over 300 million Americans have to live somewhere. And, of course, we … Read more
There are several ways in which to bring spatial data into a GIS. This article provides a brief overview of some of the more common methods for creating vector GIS data.
Guides to the various file formats and tools for data format conversions. Find conversion utilities to convert from one GIS application to another.
Hypsography, topography, elevation, TINS, and contours. There are many different terms for data relating to elevation. This article reviews some of terminology and types of … Read more
Aerial photographs play an important role in GIS data acquisition and visualization. First, they help provide a solid visual effect. Many people are more able … Read more
Data mining is the automated process of discovering patterns in data in order to find correlation among different datasets that are unexpected.