Difference between revisions of "Terrain data"

Revision as of 13:29, 24 April 2009

Below listed, are some sources for terrain data that can be used with the Pathloss program. Pathloss 4 can only use elevation and imagery data.

A word about elevation data

In the USA there is NED and SRTM. What is the difference? The short answer is the SRTM data tends to include land cover in its data (elevations are the tops of the tree canopy or built up areas), where the NED data tends to be bare earth. The following link discusses the differences and the accuracy of both data sets http://eros.usgs.gov/conferences/SRTM/presentations/Slides06_Gesch.pdf

Terrain data (Free of charge)

Geobase - Geobase elevation data (CDED), Vector data for roads etc. and satellite imagery for all of Canada.

USGS SDDS - USGS Seamless Data Distribution System for NED, SRTM, Clutter, Imagery and Vector data

NASA - NASA ftp for downloading SRTM elevation data

USGS GLCC - Global Land Cover Characteristics Data Base Version 2.0

Terrain data (Commercial)

When ever possible use the Planet format if it is available. Setup instructions for the Planet format can be downloaded at [1]

http://geoimage.fr/ - 1m to 100m resolution maps available worldwide.

http://www.infoterra.fr/Infoterra/ - 1m to 100m resolution maps available worldwide.

http://www.vexcel.com/

http://i3.com/

http://igage.com/ - Igage produces imagery datasets that cover the USA.