[OSRS-PROJ] Re: Proj4 for Windows

[Frank Warmerdam]

Børge Hansen wrote:

> Thanks a lot. I managed to compile it.
> 
> Do you have an example of an application that uses this library to convert 

> between GEO and UTM coordinates. Preferably a Visual Studio project, but 

> I'll take anything...
> 
> b.r
> Børge
> 

Børge,

I don't have a visual studio project for you, but here is a simple program
for converting from lat/long to utm.  The example demonstrates the modern
api. On Unix I can build the program like this:

% gcc -I/usr/local/include ll2utm.c -o ll2utm -lproj

ll2utm.c:

#include "proj_api.h"

int main()

{
     projPJ	src, dst;
     double	x, y;
     int         pj_err;

     src = pj_init_plus( "+proj=latlong +datum=WGS84" );
     dst = pj_init_plus( "+proj=utm +zone=11 +datum=WGS84" );

     while( scanf( "%lf %lf", &x, &y ) == 2 )
     {
         if( pj_is_latlong( src ) )
         {
             x = x * DEG_TO_RAD;
             y = y * DEG_TO_RAD;
         }

         if( (pj_err = pj_transform( src, dst, 1, 1, &x, &y, NULL )) != 0 )
         {
             printf( "pj_transform: %s", pj_strerrno( pj_err ) );
         }
         else
         {
             if( pj_is_latlong( dst ) )
                 printf( "%.8f %.8f\n", x * RAD_TO_DEG, y * RAD_TO_DEG );
             else
                 printf( "%.3f %.3f\n", x, y );
         }
     }
}

Best regards,

-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent


----------------------------------------
PROJ.4 Discussion List
See http://www.remotesensing.org/proj for subscription, unsubscription
and other information.