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geo_normalize.c
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geo_normalize.c
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/******************************************************************************
* $Id$
*
* Project: libgeotiff
* Purpose: Code to normalize PCS and other composite codes in a GeoTIFF file.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
* Copyright (c) 2018, Even Rouault <even.rouault at spatialys.com>
*
* 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 <assert.h>
#include "cpl_serv.h"
#include "geo_tiffp.h"
#include "geovalues.h"
#include "geo_normalize.h"
#include "geo_keyp.h"
#include "proj.h"
#ifndef KvUserDefined
# define KvUserDefined 32767
#endif
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif
/* EPSG Codes for projection parameters. Unfortunately, these bear no
relationship to the GeoTIFF codes even though the names are so similar. */
#define EPSGNatOriginLat 8801
#define EPSGNatOriginLong 8802
#define EPSGNatOriginScaleFactor 8805
#define EPSGFalseEasting 8806
#define EPSGFalseNorthing 8807
#define EPSGProjCenterLat 8811
#define EPSGProjCenterLong 8812
#define EPSGAzimuth 8813
#define EPSGAngleRectifiedToSkewedGrid 8814
#define EPSGInitialLineScaleFactor 8815
#define EPSGProjCenterEasting 8816
#define EPSGProjCenterNorthing 8817
#define EPSGPseudoStdParallelLat 8818
#define EPSGPseudoStdParallelScaleFactor 8819
#define EPSGFalseOriginLat 8821
#define EPSGFalseOriginLong 8822
#define EPSGStdParallel1Lat 8823
#define EPSGStdParallel2Lat 8824
#define EPSGFalseOriginEasting 8826
#define EPSGFalseOriginNorthing 8827
#define EPSGSphericalOriginLat 8828
#define EPSGSphericalOriginLong 8829
#define EPSGInitialLongitude 8830
#define EPSGZoneWidth 8831
#define EPSGLatOfStdParallel 8832
#define EPSGOriginLong 8833
#define EPSGTopocentricOriginLat 8834
#define EPSGTopocentricOriginLong 8835
#define EPSGTopocentricOriginHeight 8836
#define CT_Ext_Mercator_2SP -CT_Mercator
#ifndef CPL_INLINE
# if (defined(__GNUC__) && !defined(__NO_INLINE__)) || defined(_MSC_VER)
# define HAS_CPL_INLINE 1
# define CPL_INLINE __inline
# elif defined(__SUNPRO_CC)
# define HAS_CPL_INLINE 1
# define CPL_INLINE inline
# else
# define CPL_INLINE
# endif
#endif
#ifndef CPL_UNUSED
#if defined(__GNUC__) && __GNUC__ >= 4
# define CPL_UNUSED __attribute((__unused__))
#else
/* TODO: add cases for other compilers */
# define CPL_UNUSED
#endif
#endif
CPL_INLINE static void CPL_IGNORE_RET_VAL_INT(CPL_UNUSED int unused) {}
/************************************************************************/
/* GTIFGetPCSInfo() */
/************************************************************************/
static
int GTIFGetPCSInfoEx( PJ_CONTEXT* ctx,
int nPCSCode, char **ppszEPSGName,
short *pnProjOp, short *pnUOMLengthCode,
short *pnGeogCS )
{
int nDatum;
int nZone;
/* Deal with a few well known CRS */
int Proj = GTIFPCSToMapSys( nPCSCode, &nDatum, &nZone );
if ((Proj == MapSys_UTM_North || Proj == MapSys_UTM_South) &&
nDatum != KvUserDefined)
{
const char* pszDatumName = NULL;
switch (nDatum)
{
case GCS_NAD27: pszDatumName = "NAD27"; break;
case GCS_NAD83: pszDatumName = "NAD83"; break;
case GCS_WGS_72: pszDatumName = "WGS 72"; break;
case GCS_WGS_72BE: pszDatumName = "WGS 72BE"; break;
case GCS_WGS_84: pszDatumName = "WGS 84"; break;
default: break;
}
if (pszDatumName)
{
if (ppszEPSGName)
{
char szEPSGName[64];
sprintf(szEPSGName, "%s / UTM zone %d%c",
pszDatumName, nZone, (Proj == MapSys_UTM_North) ? 'N' : 'S');
*ppszEPSGName = CPLStrdup(szEPSGName);
}
if (pnProjOp)
*pnProjOp = (short) (((Proj == MapSys_UTM_North) ? Proj_UTM_zone_1N - 1 : Proj_UTM_zone_1S - 1) + nZone);
if (pnUOMLengthCode)
*pnUOMLengthCode = 9001; /* Linear_Meter */
if (pnGeogCS)
*pnGeogCS = (short) nDatum;
return TRUE;
}
}
{
char szCode[12];
PJ* proj_crs;
sprintf(szCode, "%d", nPCSCode);
proj_crs = proj_create_from_database(
ctx, "EPSG", szCode, PJ_CATEGORY_CRS, 0, NULL);
if( !proj_crs )
{
return FALSE;
}
if( proj_get_type(proj_crs) != PJ_TYPE_PROJECTED_CRS )
{
proj_destroy(proj_crs);
return FALSE;
}
if( ppszEPSGName )
{
const char* pszName = proj_get_name(proj_crs);
if( !pszName )
{
// shouldn't happen
proj_destroy(proj_crs);
return FALSE;
}
*ppszEPSGName = CPLStrdup(pszName);
}
if( pnProjOp )
{
PJ* conversion = proj_crs_get_coordoperation(
ctx, proj_crs);
if( !conversion )
{
// shouldn't happen except out of memory
proj_destroy(proj_crs);
return FALSE;
}
{
const char* pszConvCode = proj_get_id_code(conversion, 0);
assert( pszConvCode );
*pnProjOp = (short) atoi(pszConvCode);
}
proj_destroy(conversion);
}
if( pnUOMLengthCode )
{
PJ* coordSys = proj_crs_get_coordinate_system(
ctx, proj_crs);
if( !coordSys )
{
// shouldn't happen except out of memory
proj_destroy(proj_crs);
return FALSE;
}
{
const char* pszUnitCode = NULL;
if( !proj_cs_get_axis_info(
ctx, coordSys, 0,
NULL, /* name */
NULL, /* abbreviation*/
NULL, /* direction */
NULL, /* conversion factor */
NULL, /* unit name */
NULL, /* unit auth name (should be EPSG) */
&pszUnitCode) || pszUnitCode == NULL )
{
proj_destroy(coordSys);
return FALSE;
}
*pnUOMLengthCode = (short) atoi(pszUnitCode);
proj_destroy(coordSys);
}
}
if( pnGeogCS )
{
PJ* geod_crs = proj_crs_get_geodetic_crs(ctx, proj_crs);
if( !geod_crs )
{
// shouldn't happen except out of memory
proj_destroy(proj_crs);
return FALSE;
}
{
const char* pszGeodCode = proj_get_id_code(geod_crs, 0);
assert( pszGeodCode );
*pnGeogCS = (short) atoi(pszGeodCode);
}
proj_destroy(geod_crs);
}
proj_destroy(proj_crs);
return TRUE;
}
}
int GTIFGetPCSInfo( int nPCSCode, char **ppszEPSGName,
short *pnProjOp, short *pnUOMLengthCode,
short *pnGeogCS )
{
PJ_CONTEXT* ctx = proj_context_create();
int ret = GTIFGetPCSInfoEx(ctx, nPCSCode, ppszEPSGName, pnProjOp,
pnUOMLengthCode, pnGeogCS);
proj_context_destroy(ctx);
return ret;
}
/************************************************************************/
/* GTIFAngleToDD() */
/* */
/* Convert a numeric angle to decimal degrees. */
/************************************************************************/
double GTIFAngleToDD( double dfAngle, int nUOMAngle )
{
if( nUOMAngle == 9110 ) /* DDD.MMSSsss */
{
if( dfAngle > -999.9 && dfAngle < 999.9 )
{
char szAngleString[32];
sprintf( szAngleString, "%12.7f", dfAngle );
dfAngle = GTIFAngleStringToDD( szAngleString, nUOMAngle );
}
}
else if ( nUOMAngle != KvUserDefined )
{
double dfInDegrees = 1.0;
GTIFGetUOMAngleInfo( nUOMAngle, NULL, &dfInDegrees );
dfAngle = dfAngle * dfInDegrees;
}
return dfAngle;
}
/************************************************************************/
/* GTIFAngleStringToDD() */
/* */
/* Convert an angle in the specified units to decimal degrees. */
/************************************************************************/
double GTIFAngleStringToDD( const char * pszAngle, int nUOMAngle )
{
double dfAngle;
if( nUOMAngle == 9110 ) /* DDD.MMSSsss */
{
char *pszDecimal;
dfAngle = ABS(atoi(pszAngle));
pszDecimal = strchr(pszAngle,'.');
if( pszDecimal != NULL && strlen(pszDecimal) > 1 )
{
char szMinutes[3];
char szSeconds[64];
szMinutes[0] = pszDecimal[1];
if( pszDecimal[2] >= '0' && pszDecimal[2] <= '9' )
szMinutes[1] = pszDecimal[2];
else
szMinutes[1] = '0';
szMinutes[2] = '\0';
dfAngle += atoi(szMinutes) / 60.0;
if( strlen(pszDecimal) > 3 )
{
szSeconds[0] = pszDecimal[3];
if( pszDecimal[4] >= '0' && pszDecimal[4] <= '9' )
{
szSeconds[1] = pszDecimal[4];
szSeconds[2] = '.';
strncpy( szSeconds+3, pszDecimal + 5, sizeof(szSeconds) - 3 );
szSeconds[sizeof(szSeconds) - 1] = 0;
}
else
{
szSeconds[1] = '0';
szSeconds[2] = '\0';
}
dfAngle += GTIFAtof(szSeconds) / 3600.0;
}
}
if( pszAngle[0] == '-' )
dfAngle *= -1;
}
else if( nUOMAngle == 9105 || nUOMAngle == 9106 ) /* grad */
{
dfAngle = 180 * (GTIFAtof(pszAngle ) / 200);
}
else if( nUOMAngle == 9101 ) /* radians */
{
dfAngle = 180 * (GTIFAtof(pszAngle ) / M_PI);
}
else if( nUOMAngle == 9103 ) /* arc-minute */
{
dfAngle = GTIFAtof(pszAngle) / 60;
}
else if( nUOMAngle == 9104 ) /* arc-second */
{
dfAngle = GTIFAtof(pszAngle) / 3600;
}
else /* decimal degrees ... some cases missing but seemingly never used */
{
CPLAssert( nUOMAngle == 9102 || nUOMAngle == KvUserDefined
|| nUOMAngle == 0 );
dfAngle = GTIFAtof(pszAngle );
}
return dfAngle;
}
/************************************************************************/
/* GTIFGetGCSInfo() */
/* */
/* Fetch the datum, and prime meridian related to a particular */
/* GCS. */
/************************************************************************/
static
int GTIFGetGCSInfoEx( PJ_CONTEXT* ctx,
int nGCSCode, char ** ppszName,
short * pnDatum, short * pnPM, short *pnUOMAngle )
{
int nDatum=0, nPM, nUOMAngle;
/* -------------------------------------------------------------------- */
/* Handle some "well known" GCS codes directly */
/* -------------------------------------------------------------------- */
const char * pszName = NULL;
nPM = PM_Greenwich;
nUOMAngle = Angular_DMS_Hemisphere;
if( nGCSCode == GCS_NAD27 )
{
nDatum = Datum_North_American_Datum_1927;
pszName = "NAD27";
}
else if( nGCSCode == GCS_NAD83 )
{
nDatum = Datum_North_American_Datum_1983;
pszName = "NAD83";
}
else if( nGCSCode == GCS_WGS_84 )
{
nDatum = Datum_WGS84;
pszName = "WGS 84";
}
else if( nGCSCode == GCS_WGS_72 )
{
nDatum = Datum_WGS72;
pszName = "WGS 72";
}
else if ( nGCSCode == KvUserDefined )
{
return FALSE;
}
if (pszName != NULL)
{
if( ppszName != NULL )
*ppszName = CPLStrdup( pszName );
if( pnDatum != NULL )
*pnDatum = (short) nDatum;
if( pnPM != NULL )
*pnPM = (short) nPM;
if( pnUOMAngle != NULL )
*pnUOMAngle = (short) nUOMAngle;
return TRUE;
}
/* -------------------------------------------------------------------- */
/* Search the database. */
/* -------------------------------------------------------------------- */
{
char szCode[12];
PJ* geod_crs;
sprintf(szCode, "%d", nGCSCode);
geod_crs = proj_create_from_database(
ctx, "EPSG", szCode, PJ_CATEGORY_CRS, 0, NULL);
if( !geod_crs )
{
return FALSE;
}
{
int objType = proj_get_type(geod_crs);
if( objType != PJ_TYPE_GEODETIC_CRS &&
objType != PJ_TYPE_GEOCENTRIC_CRS &&
objType != PJ_TYPE_GEOGRAPHIC_2D_CRS &&
objType != PJ_TYPE_GEOGRAPHIC_3D_CRS )
{
proj_destroy(geod_crs);
return FALSE;
}
}
if( ppszName )
{
pszName = proj_get_name(geod_crs);
if( !pszName )
{
// shouldn't happen
proj_destroy(geod_crs);
return FALSE;
}
*ppszName = CPLStrdup(pszName);
}
if( pnDatum )
{
PJ* datum = proj_crs_get_datum(ctx, geod_crs);
if( !datum )
{
proj_destroy(geod_crs);
return FALSE;
}
{
const char* pszDatumCode = proj_get_id_code(datum, 0);
assert( pszDatumCode );
*pnDatum = (short) atoi(pszDatumCode);
}
proj_destroy(datum);
}
if( pnPM )
{
PJ* pm = proj_get_prime_meridian(ctx, geod_crs);
if( !pm )
{
proj_destroy(geod_crs);
return FALSE;
}
{
const char* pszPMCode = proj_get_id_code(pm, 0);
assert( pszPMCode );
*pnPM = (short) atoi(pszPMCode);
}
proj_destroy(pm);
}
if( pnUOMAngle )
{
PJ* coordSys = proj_crs_get_coordinate_system(
ctx, geod_crs);
if( !coordSys )
{
// shouldn't happen except out of memory
proj_destroy(geod_crs);
return FALSE;
}
{
const char* pszUnitCode = NULL;
if( !proj_cs_get_axis_info(
ctx, coordSys, 0,
NULL, /* name */
NULL, /* abbreviation*/
NULL, /* direction */
NULL, /* conversion factor */
NULL, /* unit name */
NULL, /* unit auth name (should be EPSG) */
&pszUnitCode) || pszUnitCode == NULL )
{
proj_destroy(coordSys);
return FALSE;
}
*pnUOMAngle = (short) atoi(pszUnitCode);
proj_destroy(coordSys);
}
}
proj_destroy(geod_crs);
return TRUE;
}
}
int GTIFGetGCSInfo( int nGCSCode, char ** ppszName,
short * pnDatum, short * pnPM, short *pnUOMAngle )
{
PJ_CONTEXT* ctx = proj_context_create();
int ret = GTIFGetGCSInfoEx(ctx, nGCSCode, ppszName, pnDatum,
pnPM, pnUOMAngle);
proj_context_destroy(ctx);
return ret;
}
/************************************************************************/
/* GTIFGetEllipsoidInfo() */
/* */
/* Fetch info about an ellipsoid. Axes are always returned in */
/* meters. SemiMajor computed based on inverse flattening */
/* where that is provided. */
/************************************************************************/
static
int GTIFGetEllipsoidInfoEx( PJ_CONTEXT* ctx,
int nEllipseCode, char ** ppszName,
double * pdfSemiMajor, double * pdfSemiMinor )
{
/* -------------------------------------------------------------------- */
/* Try some well known ellipsoids. */
/* -------------------------------------------------------------------- */
double dfSemiMajor=0.0;
double dfInvFlattening=0.0, dfSemiMinor=0.0;
const char *pszName = NULL;
if( nEllipseCode == Ellipse_Clarke_1866 )
{
pszName = "Clarke 1866";
dfSemiMajor = 6378206.4;
dfSemiMinor = 6356583.8;
dfInvFlattening = 0.0;
}
else if( nEllipseCode == Ellipse_GRS_1980 )
{
pszName = "GRS 1980";
dfSemiMajor = 6378137.0;
dfSemiMinor = 0.0;
dfInvFlattening = 298.257222101;
}
else if( nEllipseCode == Ellipse_WGS_84 )
{
pszName = "WGS 84";
dfSemiMajor = 6378137.0;
dfSemiMinor = 0.0;
dfInvFlattening = 298.257223563;
}
else if( nEllipseCode == 7043 )
{
pszName = "WGS 72";
dfSemiMajor = 6378135.0;
dfSemiMinor = 0.0;
dfInvFlattening = 298.26;
}
if (pszName != NULL)
{
if( dfSemiMinor == 0.0 )
dfSemiMinor = dfSemiMajor * (1 - 1.0/dfInvFlattening);
if( pdfSemiMinor != NULL )
*pdfSemiMinor = dfSemiMinor;
if( pdfSemiMajor != NULL )
*pdfSemiMajor = dfSemiMajor;
if( ppszName != NULL )
*ppszName = CPLStrdup( pszName );
return TRUE;
}
/* -------------------------------------------------------------------- */
/* Search the database. */
/* -------------------------------------------------------------------- */
{
char szCode[12];
PJ* ellipsoid;
sprintf(szCode, "%d", nEllipseCode);
ellipsoid = proj_create_from_database(
ctx, "EPSG", szCode, PJ_CATEGORY_ELLIPSOID, 0, NULL);
if( !ellipsoid )
{
return FALSE;
}
if( ppszName )
{
pszName = proj_get_name(ellipsoid);
if( !pszName )
{
// shouldn't happen
proj_destroy(ellipsoid);
return FALSE;
}
*ppszName = CPLStrdup(pszName);
}
proj_ellipsoid_get_parameters(
ctx, ellipsoid, pdfSemiMajor, pdfSemiMinor, NULL, NULL);
proj_destroy(ellipsoid);
return TRUE;
}
}
int GTIFGetEllipsoidInfo( int nEllipseCode, char ** ppszName,
double * pdfSemiMajor, double * pdfSemiMinor )
{
PJ_CONTEXT* ctx = proj_context_create();
int ret = GTIFGetEllipsoidInfoEx(ctx, nEllipseCode, ppszName, pdfSemiMajor,
pdfSemiMinor);
proj_context_destroy(ctx);
return ret;
}
/************************************************************************/
/* GTIFGetPMInfo() */
/* */
/* Get the offset between a given prime meridian and Greenwich */
/* in degrees. */
/************************************************************************/
static
int GTIFGetPMInfoEx( PJ_CONTEXT* ctx,
int nPMCode, char ** ppszName, double *pdfOffset )
{
/* -------------------------------------------------------------------- */
/* Use a special short cut for Greenwich, since it is so common. */
/* -------------------------------------------------------------------- */
if( nPMCode == PM_Greenwich )
{
if( pdfOffset != NULL )
*pdfOffset = 0.0;
if( ppszName != NULL )
*ppszName = CPLStrdup( "Greenwich" );
return TRUE;
}
/* -------------------------------------------------------------------- */
/* Search the database. */
/* -------------------------------------------------------------------- */
{
char szCode[12];
PJ* pm;
sprintf(szCode, "%d", nPMCode);
pm = proj_create_from_database(
ctx, "EPSG", szCode, PJ_CATEGORY_PRIME_MERIDIAN, 0, NULL);
if( !pm )
{
return FALSE;
}
if( ppszName )
{
const char* pszName = proj_get_name(pm);
if( !pszName )
{
// shouldn't happen
proj_destroy(pm);
return FALSE;
}
*ppszName = CPLStrdup(pszName);
}
if( pdfOffset )
{
double conv_factor = 0;
proj_prime_meridian_get_parameters(
ctx, pm, pdfOffset, &conv_factor, NULL);
*pdfOffset *= conv_factor * 180.0 / M_PI;
}
proj_destroy(pm);
return TRUE;
}
}
int GTIFGetPMInfo( int nPMCode, char ** ppszName, double *pdfOffset )
{
PJ_CONTEXT* ctx = proj_context_create();
int ret = GTIFGetPMInfoEx(ctx, nPMCode, ppszName, pdfOffset);
proj_context_destroy(ctx);
return ret;
}
/************************************************************************/
/* GTIFGetDatumInfo() */
/* */
/* Fetch the ellipsoid, and name for a datum. */
/************************************************************************/
static
int GTIFGetDatumInfoEx( PJ_CONTEXT* ctx,
int nDatumCode, char ** ppszName, short * pnEllipsoid )
{
const char* pszName = NULL;
int nEllipsoid = 0;
/* -------------------------------------------------------------------- */
/* Handle a few built-in datums. */
/* -------------------------------------------------------------------- */
if( nDatumCode == Datum_North_American_Datum_1927 )
{
nEllipsoid = Ellipse_Clarke_1866;
pszName = "North American Datum 1927";
}
else if( nDatumCode == Datum_North_American_Datum_1983 )
{
nEllipsoid = Ellipse_GRS_1980;
pszName = "North American Datum 1983";
}
else if( nDatumCode == Datum_WGS84 )
{
nEllipsoid = Ellipse_WGS_84;
pszName = "World Geodetic System 1984";
}
else if( nDatumCode == Datum_WGS72 )
{
nEllipsoid = 7043; /* WGS72 */
pszName = "World Geodetic System 1972";
}
if (pszName != NULL)
{
if( pnEllipsoid != NULL )
*pnEllipsoid = (short) nEllipsoid;
if( ppszName != NULL )
*ppszName = CPLStrdup( pszName );
return TRUE;
}
/* -------------------------------------------------------------------- */
/* Search the database. */
/* -------------------------------------------------------------------- */
{
char szCode[12];
PJ* datum;
sprintf(szCode, "%d", nDatumCode);
datum = proj_create_from_database(
ctx, "EPSG", szCode, PJ_CATEGORY_DATUM, 0, NULL);
if( !datum )
{
return FALSE;
}
if( proj_get_type(datum) != PJ_TYPE_GEODETIC_REFERENCE_FRAME )
{
proj_destroy(datum);
return FALSE;
}
if( ppszName )
{
pszName = proj_get_name(datum);
if( !pszName )
{
// shouldn't happen
proj_destroy(datum);
return FALSE;
}
*ppszName = CPLStrdup(pszName);
}
if( pnEllipsoid )
{
PJ* ellipsoid = proj_get_ellipsoid(ctx, datum);
if( !ellipsoid )
{
proj_destroy(datum);
return FALSE;
}
{
const char* pszEllipsoidCode = proj_get_id_code(
ellipsoid, 0);
assert( pszEllipsoidCode );
*pnEllipsoid = (short) atoi(pszEllipsoidCode);
}
proj_destroy(ellipsoid);
}
proj_destroy(datum);
return TRUE;
}
}
int GTIFGetDatumInfo( int nDatumCode, char ** ppszName, short * pnEllipsoid )
{
PJ_CONTEXT* ctx = proj_context_create();
int ret = GTIFGetDatumInfoEx(ctx, nDatumCode, ppszName, pnEllipsoid);
proj_context_destroy(ctx);
return ret;
}
/************************************************************************/
/* GTIFGetUOMLengthInfo() */
/* */
/* Note: This function should eventually also know how to */
/* lookup length aliases in the UOM_LE_ALIAS table. */
/************************************************************************/
static
int GTIFGetUOMLengthInfoEx( PJ_CONTEXT* ctx,
int nUOMLengthCode,
char **ppszUOMName,
double * pdfInMeters )
{
/* -------------------------------------------------------------------- */
/* We short cut meter to save work and avoid failure for missing */
/* in the most common cases. */
/* -------------------------------------------------------------------- */
if( nUOMLengthCode == 9001 )
{
if( ppszUOMName != NULL )
*ppszUOMName = CPLStrdup( "metre" );
if( pdfInMeters != NULL )
*pdfInMeters = 1.0;
return TRUE;
}
if( nUOMLengthCode == 9002 )
{
if( ppszUOMName != NULL )
*ppszUOMName = CPLStrdup( "foot" );
if( pdfInMeters != NULL )
*pdfInMeters = 0.3048;
return TRUE;
}
if( nUOMLengthCode == 9003 )
{
if( ppszUOMName != NULL )
*ppszUOMName = CPLStrdup( "US survey foot" );
if( pdfInMeters != NULL )
*pdfInMeters = 12.0 / 39.37;
return TRUE;
}
/* -------------------------------------------------------------------- */
/* Search the units database for this unit. If we don't find */
/* it return failure. */
/* -------------------------------------------------------------------- */
{
char szCode[12];
const char* pszName = NULL;
sprintf(szCode, "%d", nUOMLengthCode);
if( !proj_uom_get_info_from_database(
ctx, "EPSG", szCode, &pszName, pdfInMeters, NULL) )
{
return FALSE;
}
if( ppszUOMName )
{
*ppszUOMName = CPLStrdup(pszName);
}
return TRUE;
}
}
int GTIFGetUOMLengthInfo( int nUOMLengthCode,
char **ppszUOMName,
double * pdfInMeters )
{
PJ_CONTEXT* ctx = proj_context_create();
int ret = GTIFGetUOMLengthInfoEx(
ctx, nUOMLengthCode, ppszUOMName, pdfInMeters);
proj_context_destroy(ctx);
return ret;
}
/************************************************************************/
/* GTIFGetUOMAngleInfo() */
/************************************************************************/
static
int GTIFGetUOMAngleInfoEx( PJ_CONTEXT* ctx,
int nUOMAngleCode,
char **ppszUOMName,
double * pdfInDegrees )
{
const char *pszUOMName = NULL;
double dfInDegrees = 1.0;
switch( nUOMAngleCode )
{
case 9101:
pszUOMName = "radian";
dfInDegrees = 180.0 / M_PI;
break;
case 9102:
case 9107:
case 9108:
case 9110:
case 9122:
pszUOMName = "degree";
dfInDegrees = 1.0;
break;
case 9103:
pszUOMName = "arc-minute";
dfInDegrees = 1 / 60.0;
break;
case 9104:
pszUOMName = "arc-second";
dfInDegrees = 1 / 3600.0;
break;
case 9105:
pszUOMName = "grad";
dfInDegrees = 180.0 / 200.0;
break;