pj_utils.c
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/******************************************************************************
* $Id: pj_utils.c 1504 2009-01-06 02:11:57Z warmerdam $
*
* Project: PROJ.4
* Purpose: Some utility functions we don't want to bother putting in
* their own source files.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2001, Frank Warmerdam
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#define PJ_LIB__
#include <projects.h>
#include <string.h>
#include <math.h>
/************************************************************************/
/* pj_is_latlong() */
/* */
/* Returns TRUE if this coordinate system object is */
/* geographic. */
/************************************************************************/
int pj_is_latlong( PJ *pj )
{
return pj == NULL || pj->is_latlong;
}
/************************************************************************/
/* pj_is_geocent() */
/* */
/* Returns TRUE if this coordinate system object is geocentric. */
/************************************************************************/
int pj_is_geocent( PJ *pj )
{
return pj != NULL && pj->is_geocent;
}
/************************************************************************/
/* pj_latlong_from_proj() */
/* */
/* Return a PJ* definition defining the lat/long coordinate */
/* system on which a projection is based. If the coordinate */
/* system passed in is latlong, a clone of the same will be */
/* returned. */
/************************************************************************/
PJ *pj_latlong_from_proj( PJ *pj_in )
{
char defn[512];
int got_datum = FALSE;
pj_errno = 0;
strcpy( defn, "+proj=latlong" );
if( pj_param(pj_in->params, "tdatum").i )
{
got_datum = TRUE;
sprintf( defn+strlen(defn), " +datum=%s",
pj_param(pj_in->params,"sdatum").s );
}
else if( pj_param(pj_in->params, "tellps").i )
{
sprintf( defn+strlen(defn), " +ellps=%s",
pj_param(pj_in->params,"sellps").s );
}
else if( pj_param(pj_in->params, "ta").i )
{
sprintf( defn+strlen(defn), " +a=%s",
pj_param(pj_in->params,"sa").s );
if( pj_param(pj_in->params, "tb").i )
sprintf( defn+strlen(defn), " +b=%s",
pj_param(pj_in->params,"sb").s );
else if( pj_param(pj_in->params, "tes").i )
sprintf( defn+strlen(defn), " +es=%s",
pj_param(pj_in->params,"ses").s );
else if( pj_param(pj_in->params, "tf").i )
sprintf( defn+strlen(defn), " +f=%s",
pj_param(pj_in->params,"sf").s );
else
sprintf( defn+strlen(defn), " +es=%.16g",
pj_in->es );
}
else
{
pj_errno = -13;
return NULL;
}
if( !got_datum )
{
if( pj_param(pj_in->params, "ttowgs84").i )
sprintf( defn+strlen(defn), " +towgs84=%s",
pj_param(pj_in->params,"stowgs84").s );
if( pj_param(pj_in->params, "tnadgrids").i )
sprintf( defn+strlen(defn), " +nadgrids=%s",
pj_param(pj_in->params,"snadgrids").s );
}
/* copy over some other information related to ellipsoid */
if( pj_param(pj_in->params, "tR").i )
sprintf( defn+strlen(defn), " +R=%s",
pj_param(pj_in->params,"sR").s );
if( pj_param(pj_in->params, "tR_A").i )
sprintf( defn+strlen(defn), " +R_A" );
if( pj_param(pj_in->params, "tR_V").i )
sprintf( defn+strlen(defn), " +R_V" );
if( pj_param(pj_in->params, "tR_a").i )
sprintf( defn+strlen(defn), " +R_a" );
if( pj_param(pj_in->params, "tR_lat_a").i )
sprintf( defn+strlen(defn), " +R_lat_a=%s",
pj_param(pj_in->params,"sR_lat_a").s );
if( pj_param(pj_in->params, "tR_lat_g").i )
sprintf( defn+strlen(defn), " +R_lat_g=%s",
pj_param(pj_in->params,"sR_lat_g").s );
/* copy over prime meridian */
if( pj_param(pj_in->params, "tpm").i )
sprintf( defn+strlen(defn), " +pm=%s",
pj_param(pj_in->params,"spm").s );
return pj_init_plus( defn );
}