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<font face="Times New Roman, Times, serif">Thanks Irwin, very
interesting links, especially the georeferenced map sheets at the
NRW Geoportal. I wonder how they did the georeferencing: it looks
quite good, but not optimal. They probably chose some reference
points on each sheet and based on those rubber-sheeted them. I'm
still working on a direct georeferencing procedure from the
original UTM projection (based on the Paris meridian) to the
modern Gauss-Krüger projection, using the original triangulation
data, but to make it really precise we would need the data for the
secondary triangles, and these lie hidden in an archive somewhere
in France.<br>
<br>
It's a pity they did it only for Nordrhein-Westfalen, and that
they didn't provide a WMS service, but that's the way
bureaucracies still work. It's a good beginning, though, for
further work<br>
<br>
Thanks again for the tips,<br>
<br>
Jan Hartmann<br>
</font><br>
On 06/30/11 11:08, Irwin Scollar wrote:
<blockquote
cite="mid:201106300908.p5U9856v027677@smtp-auth.uni-koeln.de"
type="cite">
<pre wrap="">An interesting historical link to Müffling and
Tranchot which has biographies of both men and
some details on their work which I have not seen elsewhere is:
<a class="moz-txt-link-freetext" href="http://freepages.history.rootsweb.ancestry.com/~mlcarl/Qu/Karten/Tranchot.htm">http://freepages.history.rootsweb.ancestry.com/~mlcarl/Qu/Karten/Tranchot.htm</a>
A link to the work of Müffling and the early
Prussian map projection with a brief description of it's history is:
<a class="moz-txt-link-freetext" href="http://www.geog.fu-berlin.de/2bik/Kap4/kap4_1-05.php3">http://www.geog.fu-berlin.de/2bik/Kap4/kap4_1-05.php3</a>
It's application in the Rhineland is:
<a class="moz-txt-link-freetext" href="http://de.wikipedia.org/wiki/Topographische_Aufnahme_der_Rheinlande">http://de.wikipedia.org/wiki/Topographische_Aufnahme_der_Rheinlande</a>
Scans of the original maps can be found at the
GeoPortal of North-Rhine Westphalia:
<a class="moz-txt-link-freetext" href="http://www.tim-online.nrw.de/tim-online/initParams.do;jsessionid=615820C15DD0F8AB73AD2368A8295302">http://www.tim-online.nrw.de/tim-online/initParams.do;jsessionid=615820C15DD0F8AB73AD2368A8295302</a>
under the topic Historische Karten-Tranchot 1801-1828
While searching, I also learned from the Polish
historical military mapping site:
<a class="moz-txt-link-freetext" href="http://english.mapywig.org/news.php">http://english.mapywig.org/news.php</a>
that early Imperial Russian maps used the Müffling polyhedric projection:
<a class="moz-txt-link-freetext" href="http://english.mapywig.org/Russian_and_Soviet_maps_EN.htm">http://english.mapywig.org/Russian_and_Soviet_maps_EN.htm</a>
Please post additional links related to the theme of Müffling's work.
Irwin Scollar
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</pre>
</blockquote>
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