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Geographic information systems -- Software.

View Resource 7.5-Minute Digital Elevation Model (DEM)

The US Geological Survey (USGS) performs a wide variety of tasks related to the environment including data acquisition for use in geographical information systems. This data set provides elevation data for the contiguous US, Hawaii, and Alaska. Data are in one-by-one degree blocks and available via an online interface or by ftp download (instructions provided in the User Guide). Specific data can...
View Resource GeoVista Studio

GeoVista Studio is a "programming-free environment that allows users to quickly build applications for geocomputation and geographic visualization." Developed and offered by the Department of Geography at Pennsylvania State University, the program is distributed at no cost to academic and noncommercial users. The Web site contains the download, an overview of the program, examples of what can be...
View Resource GRASS GIS

With the release of such programs as Google Earth, computer users have access to a rather diverse set of geographical data tools. One program that has recently been released in a new edition is the Geographic Resources Analysis Support System (GRASS). With this program, users can perform a number of tasks, such as spatial modeling, visualization, and image processing. The program may be a bit...