[OSRS-PROJ] epsg code for swiss grid and NTF Lambert IGN

Claude Philipona claude.philipona at camptocamp.com
Thu Sep 20 08:32:06 EDT 2001

I don't know if it might insterest somebody or if it could be implemented in the
next release of proj, but here are the epsg code for Swiss grid (used with swiss
topo map) and NTF Lambert IGN (used with IGN france topo map).

I have tested all these configuration with reference points, and the result are
correct, with a small error below one meter for projection transform
(datum-shift) between swiss and france

Claude Philipona

# CH 1903 / Swiss Oblique Cylindrical
<9814> +proj=somerc +lat_0=46d57'08.66"N +lon_0=7d26'22.50"E +ellps=bessel
+x_0=600000 +y_0=200000 +towgs84=674.374,15.056,405.346 +units=m +k_0=1 +no_defs

# NTF (Paris) / France I
<27581> +proj=lcc +a=6378249.2 +b=6356515.0 +lat_0=49d30'0.0"N
+lon_0=2d20'14.025"E +lat_1=48d35'54.682"N +lat_2=50d23'45.282"N +x_0=600000.0
+y_0=200000.0 +towgs84=-168,-60,+320 +units=m no_defs <>

# NTF (Paris) / France II
<27582> +proj=lcc +a=6378249.2 +b=6356515.0 +lat_0=46d48'0.0"N
+lon_0=2d20'14.025"E +lat_1=45d53'56.108"N +lat_2=47d41'45.652"N +x_0=600000.0
+y_0=200000.0 +towgs84=-168,-60,+320 +units=m no_defs <>

# NTF (Paris) / France III
<27583> +proj=lcc +a=6378249.2 +b=6356515.0 +lat_0=44d06'0.0"N
+lon_0=2d20'14.025"E +lat_1=43d11'57.449"N +lat_2=44d59'45.938"N +x_0=600000.0
+y_0=200000.0 +towgs84=-168,-60,+320 +units=m no_defs <>

# NTF (Paris) / France IV
<27584> +proj=lcc +a=6378249.2 +b=6356515.0 +lat_0=42d09'54.0"N
+lon_0=2d20'14.025"E +lat_1=41d33'37.396"N +lat_2=42d46'03.588"N +x_0=234.358
+y_0=185861.369 +towgs84=-168,-60,+320 +units=m no_defs <>

# NTF (Paris) / France II etendu
<27585> +proj=lcc +a=6378249.2 +b=6356515.0 +lat_0=46d48'0.0"N
+lon_0=2d20'14.025"E +lat_1=45d53'56.108"N +lat_2=47d41'45.652"N +x_0=600000.0
+y_0=2200000.0 +towgs84=-168,-60,+320 +units=m no_defs <>


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