[Proj] Müffling

[Jan Hartmann]

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.

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

Thanks again for the tips,

Jan Hartmann

On 06/30/11 11:08, Irwin Scollar wrote:
> 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:
>
> http://freepages.history.rootsweb.ancestry.com/~mlcarl/Qu/Karten/Tranchot.htm
>
> A link to the work of Müffling and the early
> Prussian map projection with a brief description of it's history is:
>
> http://www.geog.fu-berlin.de/2bik/Kap4/kap4_1-05.php3
>
> It's application in the Rhineland is:
>
> http://de.wikipedia.org/wiki/Topographische_Aufnahme_der_Rheinlande
>
> Scans of the original maps can be found at the
> GeoPortal of North-Rhine Westphalia:
>
> http://www.tim-online.nrw.de/tim-online/initParams.do;jsessionid=615820C15DD0F8AB73AD2368A8295302
>
> under the topic Historische Karten-Tranchot 1801-1828
>
> While searching, I also learned from the Polish
> historical military mapping site:
>
> http://english.mapywig.org/news.php
>
> that early Imperial Russian maps used the Müffling polyhedric projection:
>
> http://english.mapywig.org/Russian_and_Soviet_maps_EN.htm
>
> Please post additional links related to the theme of Müffling's work.
>
>
> Irwin Scollar
>
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