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/******************************************************************************
* $Id$
*
* Project: Hierarchical Data Format Release 4 (HDF4)
* Purpose: This is the wrapper code to use OGR Coordinate Transformation
* services instead of GCTP library
* Author: Andrey Kiselev, dron@ak4719.spb.edu
*
******************************************************************************
* Copyright (c) 2004, Andrey Kiselev <dron@ak4719.spb.edu>
*
* 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.
****************************************************************************/
#include "ogr_srs_api.h"
#include <stdlib.h>
#include "mfhdf.h"
#include <math.h>
#ifndef PI
#ifndef M_PI
#define PI (3.141592653589793238)
#else
#define PI (M_PI)
#endif
#endif
#define DEG (180.0 / PI)
#define RAD (PI / 180.0)
void for_init(
int32 outsys, /* output system code */
int32 outzone, /* output zone number */
float64 *outparm, /* output array of projection parameters */
int32 outdatum, /* output datum */
char *fn27, /* NAD 1927 parameter file */
char *fn83, /* NAD 1983 parameter file */
int32 *iflg, /* status flag */
int32 (*for_trans[])(double, double, double *, double *));
void inv_init(
int32 insys, /* input system code */
int32 inzone, /* input zone number */
float64 *inparm, /* input array of projection parameters */
int32 indatum, /* input datum code */
char *fn27, /* NAD 1927 parameter file */
char *fn83, /* NAD 1983 parameter file */
int32 *iflg, /* status flag */
int32 (*inv_trans[])(double, double, double*, double*));
/***** static vars to store the transformers in *****/
/***** this is not thread safe *****/
static OGRCoordinateTransformationH hForCT, hInvCT;
/******************************************************************************
function for forward gctp transformation
gctp expects Longitude and Latitude values to be in radians
******************************************************************************/
static int32 osr_for(
double lon, /* (I) Longitude */
double lat, /* (I) Latitude */
double *x, /* (O) X projection coordinate */
double *y) /* (O) Y projection coordinate */
{
double dfX, dfY, dfZ = 0.0;
dfX = lon * DEG;
dfY = lat * DEG;
OCTTransform( hForCT, 1, &dfX, &dfY, &dfZ);
*x = dfX;
*y = dfY;
return 0;
}
/******************************************************************************
function to init a forward gctp transformer
******************************************************************************/
void for_init(
int32 outsys, /* output system code */
int32 outzone, /* output zone number */
float64 *outparm, /* output array of projection parameters */
int32 outdatum, /* output datum */
CPL_UNUSED char *fn27, /* NAD 1927 parameter file */
CPL_UNUSED char *fn83, /* NAD 1983 parameter file */
int32 *iflg, /* status flag */
int32 (*for_trans[])(double, double, double *, double *))
/* forward function pointer */
{
OGRSpatialReferenceH hOutSourceSRS, hLatLong = NULL;
*iflg = 0;
hOutSourceSRS = OSRNewSpatialReference( NULL );
OSRSetAxisMappingStrategy(hOutSourceSRS, OAMS_TRADITIONAL_GIS_ORDER);
OSRImportFromUSGS( hOutSourceSRS, outsys, outzone, outparm, outdatum );
hLatLong = OSRNewSpatialReference ( SRS_WKT_WGS84_LAT_LONG );
OSRSetAxisMappingStrategy(hLatLong, OAMS_TRADITIONAL_GIS_ORDER);
hForCT = OCTNewCoordinateTransformation( hLatLong, hOutSourceSRS );
OSRDestroySpatialReference( hOutSourceSRS );
OSRDestroySpatialReference( hLatLong );
for_trans[outsys] = osr_for;
}
/******************************************************************************
function for inverse gctp transformation
gctp returns Longitude and Latitude values in radians
******************************************************************************/
static int32 osr_inv(
double x, /* (I) X projection coordinate */
double y, /* (I) Y projection coordinate */
double *lon, /* (O) Longitude */
double *lat) /* (O) Latitude */
{
double dfX, dfY, dfZ = 0.0;
dfX = x;
dfY = y;
OCTTransform( hInvCT, 1, &dfX, &dfY, &dfZ );
*lon = dfX * RAD;
*lat = dfY * RAD;
return 0;
}
/******************************************************************************
function to init a inverse gctp transformer
******************************************************************************/
void inv_init(
int32 insys, /* input system code */
int32 inzone, /* input zone number */
float64 *inparm, /* input array of projection parameters */
int32 indatum, /* input datum code */
CPL_UNUSED char *fn27, /* NAD 1927 parameter file */
CPL_UNUSED char *fn83, /* NAD 1983 parameter file */
int32 *iflg, /* status flag */
int32 (*inv_trans[])(double, double, double*, double*))
/* inverse function pointer */
{
OGRSpatialReferenceH hInSourceSRS, hLatLong = NULL;
*iflg = 0;
hInSourceSRS = OSRNewSpatialReference( NULL );
OSRSetAxisMappingStrategy(hInSourceSRS, OAMS_TRADITIONAL_GIS_ORDER);
OSRImportFromUSGS( hInSourceSRS, insys, inzone, inparm, indatum );
hLatLong = OSRNewSpatialReference ( SRS_WKT_WGS84_LAT_LONG );
OSRSetAxisMappingStrategy(hLatLong, OAMS_TRADITIONAL_GIS_ORDER);
hInvCT = OCTNewCoordinateTransformation( hInSourceSRS, hLatLong );
OSRDestroySpatialReference( hInSourceSRS );
OSRDestroySpatialReference( hLatLong );
inv_trans[insys] = osr_inv;
}
/******************************************************************************
function to cleanup the transformers
note: gctp does not have a function that does this
******************************************************************************/
#ifndef GDAL_COMPILATION
void gctp_destroy(void) {
OCTDestroyCoordinateTransformation ( hForCT );
OCTDestroyCoordinateTransformation ( hInvCT );
}
#endif
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