[Gvsig_english] Gvsig_internacional Digest, Vol 155, Issue 13

[Sean McKenzie]

Thanks.

For those of you who are interested, I wish to divide France and surrounding regions into regions, and have been looking at elevation, roman roads and rivers and river basins  Rivers tend to run through low altitudes, and their basin boundaries tend to be at high altitude, and so altitude doe snot add much information.  I have city data from Bairoch, I have his populations, and I looked up the Lat/Lon of the cities.  I am trying to divide france into what would be "natural regions" not dependent on the modern political boundaries.  I have found that river basins approximate modern and historical political boundaries.  The division of Charlemagnes Empire into 3 in 843 CE seems to nearly confirm with rivers or river basins throughout.

If anyone else is interested in this period (987-1800) that is what I am working on.  France is the focus of things, but I need to look at the adjoining areas, Spain, Andorra, Italy, Switzerland, Germany, Luxembourg, Belgium, Holland.


Good luck!
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Today's Topics:

   1. Re: Contour maps/elevation map/terrain map (Michael Patrick)


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Message: 1
Date: Wed, 30 Jan 2019 12:00:05 -0800
From: Michael Patrick <geodesy99 at gmail.com>
To: gvsig_internacional at listserv.gva.es
Subject: Re: [Gvsig_english] Contour maps/elevation map/terrain map
Message-ID:
        <CAC54+E7rUFYBpUTmAr=gjpJRM88QNgWi+tW7ue7g+kN-m_g9Bg at mail.gmail.com>
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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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