[Gvsig_english] Contour maps/elevation map/terrain map

[Michael Patrick]

For general global coverage ( specific locals may have elevation data art
resolutions down to the centimeter level ) the GMTED2010 at
https://topotools.cr.usgs.gov/gmted_viewer/viewer.htm

>From the Danielson, J.J., and Gesch, D.B., 2011, Global multi-resolution
terrain elevation data 2010 (GMTED2010): U.S. Geological Survey Open-File
Report 2011–1073 at https://pubs.usgs.gov/of/2011/1073/pdf/of2011-1073.pdf

*"The USGS and the NGA have collaborated on the development of a notably
enhanced global elevation model named the GMTED2010 that replaces GTOPO30
as the elevation dataset of choice for global and continental scale
applications.The new model has been generated at three separate resolutions
(horizontal post spacings) of 30 arc-seconds (about1 kilometer), 15
arc-seconds (about 500 meters), and 7.5 arc-seconds (about 250 meters)."*

I prefer it because it is one of the few non-commercial extant elevation
sources that has extensive technical documentation on what it was derived
from, how it was processed, and the quality level in any particular region
( see the overview report linked above ). In the United States, the 3D
Elevation Program (3DEP) is the best nation-wide available (
https://www.usgs.gov/core-science-systems/ngp/3dep ). It also has a clear
intellectual property trail if you are publishing or re-distributing your
data products downstream.

Of course, specific counties, provinces, municipalities, and agency
projects may have far more up to date and higher resolution elevation data.

Michael Patrick
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