[Proj] projection of Madagascar
ovv at hetnet.nl
Wed Apr 30 05:49:28 EDT 2008
Gerald I. Evenden wrote:
> Just to add to the confusion, libproj has always contained the +proj=labrd
> projection based upon a development by John Snyder. An example script would
> PROJ="+proj=labrd +ellps=intl +azi=18d54 +lat_0=18d54S +lon_0=46d26'13.95E
> +k_0=0.9995 +x_0=400000 +y_0=800000"
> Are there any known values known to be acceptable by Madagascar
The longitude of origin of 46d 26'13.95E puzzles me.
This value is given in the Madagascar Grids & Datums article by mr.
Mugnier, but he gives a value of 21G with respect to Paris, which would
be the same as 46d 26m 13.95s East of Greenwich (see column 2 on page
144 of said article).
Hmmm... that would be a new chapter in cartography!
Anyhow, the EPSG GN 7-2 value of 46d 26m 14.025s wrt Greenwich is
equivalent with exactly 49 grad wrt Paris. Wouldn't that be a more
Oscar van Vlijmen
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