raster data

A map showing in orange the range of steller's jay and in blue the range of blue jay over a gray shaded relief map of the United States.

Types of GIS Data Explored: Vector and Raster

Caitlin Dempsey

Explore the key differences between GIS vector and raster data, and how each type supports diverse spatial analysis tasks.

What is GIS?

Caitlin Dempsey

GIS is a technological field that incorporates geographical features with tabular data in order to map, analyze, and assess real-world problems.

Imagery and Its Use in GIS

Amanda Briney

Most imagery for use in GIS projects consist of satellite images or aerial photographs but it can also include, thermal images, digital elevation models (DEMs), scanned maps and land classification maps. This article examines imagery and how to effectively gather, store, process and interpret it for a variety of different GIS projects.

GMTED2010 - Global elevation data.

New Global Elevation Data Available: Global Multi-resolution Terrain Elevation Data 2010

Caitlin Dempsey

NGA and USGS revised and improved their global elevation model.

Satellite imagery

Caitlin Dempsey

Digital imagery can greatly enhance a GIS. Part of the raster data types, imagery is a powerful visual aid and ...