Hello,<br><br>I'm trying to add a line in the PostGIS SPATIAL_REF_SYS Table.<br><br>My SRS WKT is:<br>PROJCS["NTF_Lambert_II_étendu",<br> GEOGCS["GCS_NTF",<br> DATUM["Nouvelle_Triangulation_Francaise",
<br> SPHEROID["Clarke_1880_IGN",6378249.2,293.46602]],<br> PRIMEM["Greenwich",0.0],<br> UNIT["Degree",0.0174532925199433]],<br> PROJECTION["Lambert_Conformal_Conic_1SP"],
<br> PARAMETER["False_Easting",600000.0],<br> PARAMETER["False_Northing",2200000.0],<br> PARAMETER["Central_Meridian",2.3372291667],<br> PARAMETER["Standard_Parallel_1",
45.8989188889],<br> PARAMETER["Standard_Parallel_2",47.6960144444],<br> PARAMETER["Scale_Factor",1.0],<br> PARAMETER["Latitude_Of_Origin",46.8],<br> UNIT["Meter",1.0]]<br>
<br>And I'm trying to figure out what is the corresponding proj4text:<br>+proj=lcc +x_0=600000<br> +y_0=2200000<br> +lon_0=2.3372291667<br> +lat_1=45.8989188889<br> +lat_2=
47.6960144444 <br> +k_0=1<br> +lat_0=46.8<br> +units=m<br> +a=6378249.2<br> +towgs84=-168,-60,320,0,0,0,0<br> +pm=greenwich
<br><br>However, I've some problems finding information about projections arguments, especially about spheroid information. <br><br>SPHEROID["Clarke_1880_IGN",6378249.2,293.46602]],<br><br>I guess I can use "+a" for
6378249.2 but what is the argument for 293.46602 ?<br><br>NB: I already tryied :<br>$ proj -le | grep clrk80<br> clrk80 a=6378249.145 rf=293.4663 Clarke 1880 mod.<br><br>But it seam that I can't use the +ellps=clrk80 because the values don't match exactly with mine.
<br><br>May I use +rf=293.46602 ?<br><br>What about this UNIT["Degree",0.0174532925199433]], ?<br><br><br><br>Thanks in advance<br><br><br clear="all">Best regards<br>-- <br>Romain CHERCHI