Difference between revisions of "Terrain data"
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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. | 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. | ||
| − | + | === NED vs SRTM in the USA === | |
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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. | 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. | ||
Revision as of 14:36, 21 December 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.
NED vs SRTM in the USA
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
MRLC - NED and NLCD 2006 data in BIL format
NED 1 arc second and NED 1/3 arc second Download Tool - Pre-packaged NED data in GridFloat format
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 ASTER Global DEM Version 2
Global Data Explorer - Global terrain data in ASTER, SRTM 30m SRTM 90m and GTOPO30 (30 arc second)
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://igage.com/ - Igage produces imagery datasets that cover the USA.
