[OSRS-PROJ] lcc projection

[Markus Neteler]

Emmanuel,

On Tue, May 15, 2001 at 09:38:13AM +0200, Emmanuel Verlynde wrote:
> i need to convert geodesic coordinates Lat/Long from misc GPS in european, north-african and east states.
> 
> they're use different geodesic system wgs84, ntf, rgf93, etrs89... and want planar coordinates in a lot of projection planar system like UTM, Gauss Krüger, Lambert belge 72, Gauss Boaga, lambert 2 étendu, Bessel, etc.
> 
> i try to use proj4 in .lib format compiled in a windows executable project, and now i have succed to call projection function but results are bad.
> 
> ex:    GPS (WGS84, Lat/Lon)       =>          Lambert2 étendu (NTF)
>                       0.0/0.0                           259283.17194/-3387561.891
> 
> instead of => 600.0/-3546.0974626
> 
> ------------------------------------------------------------------------------------------------------
> 
> static char *parms[] = {"proj=lcc","ellps=clrk80","lat_0=46d8'0.0\"",
>                                       "lon_0=2d20'14.025\"","lat_1=41d33'37.00\"",
>                                       "lat_2=47d41'45.65\"","x_0=600000.0","y_0=2200000.0"};
>    ...
>    putenv ("PROJ_LIB=C:\\Temp\\proj-4.4.3\\ess");
>    if (ref = pj_init(sizeof(parms)/sizeof(char*), parms))
>       {
>       data.u = 0 * DEG_TO_RAD;       // latitude
>       data.v = 0 * DEG_TO_RAD;      // longitude
>       data = pj_fwd(data, ref);
>       ...
> 
> ------------------------------------------------------------------------------------------------------
> 
> maybe it's due to mistake in ellipsoïde parameter? can i take to proj4 an
> ellipsoïd's excentricity (l2+: e=0.08248325676)?
above I leave to the experts ....

> someone can help me to give projection parameter example in utm, gauss,
> bessel, lambert 2 or 72 of geodesic parameter from GPS in WGS84 or another
> system...

you find plenty of European projection definitions at this site:
http://www.geocities.com/mapref/mapref.html

-> Map Projections

(really an excellent site!)

Select:
 Gauss-Krueger, UTM, LCC: Germany
 Gauss-Boaga:   Italy
 LCC, UTM:      France

etc. Probably it is some help to your questions.

Cheers

 Markus Neteler
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