Geografic-Information-System/lib/gis/proj1.c

/*!
  \file gis/proj1.c
 *
 * \brief GIS Library - Projection support
 *
 * (C) 2001-2009 by the GRASS Development Team
 *
 * This program is free software under the GNU General Public License
 * (>=v2). Read the file COPYING that comes with GRASS for details.
 *
 * \author Original author CERL
 */

#include <grass/gis.h>

/*!
  \brief Query cartographic projection
  
  This routine returns a code indicating the projection for the active region.  The current
  values are:
   - PROJECTION_XY  0 - x,y (Raw imagery)
   - PROJECTION_UTM 1 - UTM   Universal Transverse Mercator
   - PROJECTION_SP  2 - State Plane (in feet)
   - PROJECTION_LL  3 - Latitude-Longitude

   Others may be added in the future.

   \return projection code (see above)
*/
int G_projection(void)
{
    struct Cell_head window;

    G_get_set_window(&window);
    return window.proj;
}