Difference between revisions of "Terrain data"

Revision as of 12:47, 18 October 2012

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.

Use this tool to download SRTM data http://www.pathloss.com/mapsearch.html

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.

Terrain data (Free of charge)

Toporama - 1:50,000 scale UTM projected topographic maps for Canada

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

The National Map - USGS National Map viewer. Download the most current topographic base map data and products for free

SRTM - USGS site for downloading SRTM elevation data.

SRTM30 - USGS site for downloading SRTM30 which is an upgraded version of GTOPO30.

Global Land Cover Characteristics Data Base (GLCC World) - Global Land Cover Characteristics Data Base Version 2.0 (Pathloss 5 only)

ASTER - 1 second Global Digital Elevation Map (GDEM)

Terrain data (Commercial)

Most commercial data is supplied in a rectangular projection (e.g UTM). Be sure to specify that the data must be provided in a BIL format. Setup instructions for Version 4 are available at http://www.pathloss.com/downloads/docs/planet_utm.pdf

http://www.siradel.com - 1m to 100m resolution high quality map data available worldwide.

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.