[GRASSLIST:7484] Re: Projection LAMBERT III (South of France) parameters

[Didrik Pinte]

Le jeudi 07 juillet 2005 à 07:05 +0000, Selim HERNANDEZ a écrit :
> 
> Did anyone ever run an project that worked with LAMBERT III coords ?
> 
> thanks

I ran with some problems using esg:27572 (Lambert II) for the South of
France. Points were some hundred kilometers on the right of their real
situation when projected from espg:4326 to epsg:27572. 


I had to correct the epsg file. Here are the original and corrected
parameters :

# NTF (Paris) / Lambert zone II
# BAD ORIGINAL 
# <27572> +proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=-2.33722917
+k_0=0.99987742 +x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515
+towgs84=-168,-60,320,0,0,0,0 +pm=paris +units=m +no_defs  <>
# WORKING AND VERIFIED 
<27572> +proj=lcc +a=6378249.2000000002 +b=6356515.000 +es=0.0068034876
+rf=293.4660212940 +lat_0=46.800N +lon_0=2d20'14.025E
+lat_1=45d53'56.108N +lat_2=47d41'45.652N +x_0=600000.000
+y_0=2200000.000 +units=m +no_defs +towgs84=-168,-60,+320


Hope this helps.

Didrik

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