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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
*
* 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 "cpl_serv.h"
#include "geo_tiffp.h"
#include "geovalues.h"
#include "geo_normalize.h"
#ifndef KvUserDefined
# define KvUserDefined 32767
#endif
#ifndef PI
# define 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
/************************************************************************/
/* GTIFGetPCSInfo() */
/************************************************************************/
int GTIFGetPCSInfo( int nPCSCode, char **ppszEPSGName,
short *pnProjOp, short *pnUOMLengthCode,
short *pnGeogCS )
{
char **papszRecord;
char szSearchKey[24];
const char *pszFilename;
int nDatum;
int nZone;
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;
}
}
/* -------------------------------------------------------------------- */
/* Search the pcs.override table for this PCS. */
/* -------------------------------------------------------------------- */
pszFilename = CSVFilename( "pcs.override.csv" );
sprintf( szSearchKey, "%d", nPCSCode );
papszRecord = CSVScanFileByName( pszFilename, "COORD_REF_SYS_CODE",
szSearchKey, CC_Integer );
/* -------------------------------------------------------------------- */
/* If not found, search the EPSG PCS database. */
/* -------------------------------------------------------------------- */
if( papszRecord == NULL )
{
pszFilename = CSVFilename( "pcs.csv" );
sprintf( szSearchKey, "%d", nPCSCode );
papszRecord = CSVScanFileByName( pszFilename, "COORD_REF_SYS_CODE",
szSearchKey, CC_Integer );
if( papszRecord == NULL )
return FALSE;
}
/* -------------------------------------------------------------------- */
/* Get the name, if requested. */
/* -------------------------------------------------------------------- */
if( ppszEPSGName != NULL )
{
*ppszEPSGName =
CPLStrdup( CSLGetField( papszRecord,
CSVGetFileFieldId(pszFilename,
"COORD_REF_SYS_NAME") ));
}
/* -------------------------------------------------------------------- */
/* Get the UOM Length code, if requested. */
/* -------------------------------------------------------------------- */
if( pnUOMLengthCode != NULL )
{
const char *pszValue;
pszValue =
CSLGetField( papszRecord,
CSVGetFileFieldId(pszFilename,"UOM_CODE"));
if( atoi(pszValue) > 0 )
*pnUOMLengthCode = (short) atoi(pszValue);
else
*pnUOMLengthCode = KvUserDefined;
}
/* -------------------------------------------------------------------- */
/* Get the UOM Length code, if requested. */
/* -------------------------------------------------------------------- */
if( pnProjOp != NULL )
{
const char *pszValue;
pszValue =
CSLGetField( papszRecord,
CSVGetFileFieldId(pszFilename,"COORD_OP_CODE"));
if( atoi(pszValue) > 0 )
*pnProjOp = (short) atoi(pszValue);
else
*pnUOMLengthCode = KvUserDefined;
}
/* -------------------------------------------------------------------- */
/* Get the GeogCS (Datum with PM) code, if requested. */
/* -------------------------------------------------------------------- */
if( pnGeogCS != NULL )
{
const char *pszValue;
pszValue =
CSLGetField( papszRecord,
CSVGetFileFieldId(pszFilename,"SOURCE_GEOGCRS_CODE"));
if( atoi(pszValue) > 0 )
*pnGeogCS = (short) atoi(pszValue);
else
*pnGeogCS = KvUserDefined;
}
return TRUE;
}
/************************************************************************/
/* GTIFAngleToDD() */
/* */
/* Convert a numeric angle to decimal degress. */
/************************************************************************/
double GTIFAngleToDD( double dfAngle, int nUOMAngle )
{
if( nUOMAngle == 9110 ) /* DDD.MMSSsss */
{
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 ) / 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 seeminly 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. */
/************************************************************************/
int GTIFGetGCSInfo( int nGCSCode, char ** ppszName,
short * pnDatum, short * pnPM, short *pnUOMAngle )
{
char szSearchKey[24];
int nDatum=0, nPM, nUOMAngle;
const char *pszFilename;
/* -------------------------------------------------------------------- */
/* 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 for the corresponding datum code. */
/* -------------------------------------------------------------------- */
pszFilename = CSVFilename("gcs.override.csv");
sprintf( szSearchKey, "%d", nGCSCode );
nDatum = atoi(CSVGetField( pszFilename,
"COORD_REF_SYS_CODE", szSearchKey,
CC_Integer, "DATUM_CODE" ) );
if( nDatum < 1 )
{
pszFilename = CSVFilename("gcs.csv");
sprintf( szSearchKey, "%d", nGCSCode );
nDatum = atoi(CSVGetField( pszFilename,
"COORD_REF_SYS_CODE", szSearchKey,
CC_Integer, "DATUM_CODE" ) );
}
if( nDatum < 1 )
{
return FALSE;
}
if( pnDatum != NULL )
*pnDatum = (short) nDatum;
/* -------------------------------------------------------------------- */
/* Get the PM. */
/* -------------------------------------------------------------------- */
if( pnPM != NULL )
{
nPM = atoi(CSVGetField( pszFilename,
"COORD_REF_SYS_CODE", szSearchKey, CC_Integer,
"PRIME_MERIDIAN_CODE" ) );
if( nPM < 1 )
return FALSE;
*pnPM = (short) nPM;
}
/* -------------------------------------------------------------------- */
/* Get the angular units. */
/* -------------------------------------------------------------------- */
nUOMAngle = atoi(CSVGetField( pszFilename,
"COORD_REF_SYS_CODE",szSearchKey, CC_Integer,
"UOM_CODE" ) );
if( nUOMAngle < 1 )
return FALSE;
if( pnUOMAngle != NULL )
*pnUOMAngle = (short) nUOMAngle;
/* -------------------------------------------------------------------- */
/* Get the name, if requested. */
/* -------------------------------------------------------------------- */
if( ppszName != NULL )
*ppszName =
CPLStrdup(CSVGetField( pszFilename,
"COORD_REF_SYS_CODE",szSearchKey,CC_Integer,
"COORD_REF_SYS_NAME" ));
return( TRUE );
}
/************************************************************************/
/* GTIFGetEllipsoidInfo() */
/* */
/* Fetch info about an ellipsoid. Axes are always returned in */
/* meters. SemiMajor computed based on inverse flattening */
/* where that is provided. */
/************************************************************************/
int GTIFGetEllipsoidInfo( int nEllipseCode, char ** ppszName,
double * pdfSemiMajor, double * pdfSemiMinor )
{
char szSearchKey[24];
double dfSemiMajor=0.0, dfToMeters = 1.0;
int nUOMLength;
/* -------------------------------------------------------------------- */
/* Try some well known ellipsoids. */
/* -------------------------------------------------------------------- */
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;
}
/* -------------------------------------------------------------------- */
/* Get the semi major axis. */
/* -------------------------------------------------------------------- */
sprintf( szSearchKey, "%d", nEllipseCode );
dfSemiMajor =
GTIFAtof(CSVGetField( CSVFilename("ellipsoid.csv"),
"ELLIPSOID_CODE", szSearchKey, CC_Integer,
"SEMI_MAJOR_AXIS" ) );
if( dfSemiMajor == 0.0 )
{
return FALSE;
}
/* -------------------------------------------------------------------- */
/* Get the translation factor into meters. */
/* -------------------------------------------------------------------- */
nUOMLength = atoi(CSVGetField( CSVFilename("ellipsoid.csv"),
"ELLIPSOID_CODE", szSearchKey, CC_Integer,
"UOM_CODE" ));
GTIFGetUOMLengthInfo( nUOMLength, NULL, &dfToMeters );
dfSemiMajor *= dfToMeters;
if( pdfSemiMajor != NULL )
*pdfSemiMajor = dfSemiMajor;
/* -------------------------------------------------------------------- */
/* Get the semi-minor if requested. If the Semi-minor axis */
/* isn't available, compute it based on the inverse flattening. */
/* -------------------------------------------------------------------- */
if( pdfSemiMinor != NULL )
{
*pdfSemiMinor =
GTIFAtof(CSVGetField( CSVFilename("ellipsoid.csv"),
"ELLIPSOID_CODE", szSearchKey, CC_Integer,
"SEMI_MINOR_AXIS" )) * dfToMeters;
if( *pdfSemiMinor == 0.0 )
{
double dfInvFlattening;
dfInvFlattening =
GTIFAtof(CSVGetField( CSVFilename("ellipsoid.csv"),
"ELLIPSOID_CODE", szSearchKey, CC_Integer,
"INV_FLATTENING" ));
*pdfSemiMinor = dfSemiMajor * (1 - 1.0/dfInvFlattening);
}
}
/* -------------------------------------------------------------------- */
/* Get the name, if requested. */
/* -------------------------------------------------------------------- */
if( ppszName != NULL )
*ppszName =
CPLStrdup(CSVGetField( CSVFilename("ellipsoid.csv"),
"ELLIPSOID_CODE", szSearchKey, CC_Integer,
"ELLIPSOID_NAME" ));
return( TRUE );
}
/************************************************************************/
/* GTIFGetPMInfo() */
/* */
/* Get the offset between a given prime meridian and Greenwich */
/* in degrees. */
/************************************************************************/
int GTIFGetPMInfo( int nPMCode, char ** ppszName, double *pdfOffset )
{
char szSearchKey[24];
int nUOMAngle;
const char *pszFilename;
/* -------------------------------------------------------------------- */
/* 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 for the corresponding datum code. */
/* -------------------------------------------------------------------- */
pszFilename = CSVFilename("prime_meridian.csv");
sprintf( szSearchKey, "%d", nPMCode );
nUOMAngle =
atoi(CSVGetField( pszFilename,
"PRIME_MERIDIAN_CODE", szSearchKey, CC_Integer,
"UOM_CODE" ) );
if( nUOMAngle < 1 )
return FALSE;
/* -------------------------------------------------------------------- */
/* Get the PM offset. */
/* -------------------------------------------------------------------- */
if( pdfOffset != NULL )
{
*pdfOffset =
GTIFAngleStringToDD(
CSVGetField( pszFilename,
"PRIME_MERIDIAN_CODE", szSearchKey, CC_Integer,
"GREENWICH_LONGITUDE" ),
nUOMAngle );
}
/* -------------------------------------------------------------------- */
/* Get the name, if requested. */
/* -------------------------------------------------------------------- */
if( ppszName != NULL )
*ppszName =
CPLStrdup(
CSVGetField( pszFilename,
"PRIME_MERIDIAN_CODE", szSearchKey, CC_Integer,
"PRIME_MERIDIAN_NAME" ));
return( TRUE );
}
/************************************************************************/
/* GTIFGetDatumInfo() */
/* */
/* Fetch the ellipsoid, and name for a datum. */
/************************************************************************/
int GTIFGetDatumInfo( int nDatumCode, char ** ppszName, short * pnEllipsoid )
{
char szSearchKey[24];
int nEllipsoid = 0;
const char *pszFilename;
FILE *fp;
const char *pszName = NULL;
/* -------------------------------------------------------------------- */
/* 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;
}
/* -------------------------------------------------------------------- */
/* If we can't find datum.csv then gdal_datum.csv is an */
/* acceptable fallback. Mostly this is for GDAL. */
/* -------------------------------------------------------------------- */
pszFilename = CSVFilename( "datum.csv" );
if( (fp = VSIFOpen(pszFilename,"r")) == NULL )
{
if( (fp = VSIFOpen(CSVFilename("gdal_datum.csv"), "r")) != NULL )
{
pszFilename = CSVFilename( "gdal_datum.csv" );
VSIFClose( fp );
}
}
else
VSIFClose( fp );
/* -------------------------------------------------------------------- */
/* Search the database for the corresponding datum code. */
/* -------------------------------------------------------------------- */
sprintf( szSearchKey, "%d", nDatumCode );
nEllipsoid = atoi(CSVGetField( pszFilename,
"DATUM_CODE", szSearchKey, CC_Integer,
"ELLIPSOID_CODE" ) );
if( pnEllipsoid != NULL )
*pnEllipsoid = (short) nEllipsoid;
if( nEllipsoid < 1 )
{
return FALSE;
}
/* -------------------------------------------------------------------- */
/* Get the name, if requested. */
/* -------------------------------------------------------------------- */
if( ppszName != NULL )
*ppszName =
CPLStrdup(CSVGetField( pszFilename,
"DATUM_CODE", szSearchKey, CC_Integer,
"DATUM_NAME" ));
return( TRUE );
}
/************************************************************************/
/* GTIFGetUOMLengthInfo() */
/* */
/* Note: This function should eventually also know how to */
/* lookup length aliases in the UOM_LE_ALIAS table. */
/************************************************************************/
int GTIFGetUOMLengthInfo( int nUOMLengthCode,
char **ppszUOMName,
double * pdfInMeters )
{
char **papszUnitsRecord;
char szSearchKey[24];
int iNameField;
const char *pszFilename;
/* -------------------------------------------------------------------- */
/* 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. */
/* -------------------------------------------------------------------- */
pszFilename = CSVFilename( "unit_of_measure.csv" );
sprintf( szSearchKey, "%d", nUOMLengthCode );
papszUnitsRecord =
CSVScanFileByName( pszFilename,
"UOM_CODE", szSearchKey, CC_Integer );
if( papszUnitsRecord == NULL )
return FALSE;
/* -------------------------------------------------------------------- */
/* Get the name, if requested. */
/* -------------------------------------------------------------------- */
if( ppszUOMName != NULL )
{
iNameField = CSVGetFileFieldId( pszFilename,
"UNIT_OF_MEAS_NAME" );
*ppszUOMName = CPLStrdup( CSLGetField(papszUnitsRecord, iNameField) );
}
/* -------------------------------------------------------------------- */
/* Get the A and B factor fields, and create the multiplicative */
/* factor. */
/* -------------------------------------------------------------------- */
if( pdfInMeters != NULL )
{
int iBFactorField, iCFactorField;
iBFactorField = CSVGetFileFieldId( pszFilename, "FACTOR_B" );
iCFactorField = CSVGetFileFieldId( pszFilename, "FACTOR_C" );
if( GTIFAtof(CSLGetField(papszUnitsRecord, iCFactorField)) > 0.0 )
*pdfInMeters = GTIFAtof(CSLGetField(papszUnitsRecord, iBFactorField))
/ GTIFAtof(CSLGetField(papszUnitsRecord, iCFactorField));
else
*pdfInMeters = 0.0;
}
return( TRUE );
}
/************************************************************************/
/* GTIFGetUOMAngleInfo() */
/************************************************************************/
int GTIFGetUOMAngleInfo( int nUOMAngleCode,
char **ppszUOMName,
double * pdfInDegrees )
{
const char *pszUOMName = NULL;
double dfInDegrees = 1.0;
const char *pszFilename;
char szSearchKey[24];
switch( nUOMAngleCode )
{
case 9101:
pszUOMName = "radian";
dfInDegrees = 180.0 / 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;
case 9106:
pszUOMName = "gon";
dfInDegrees = 180.0 / 200.0;
break;
case 9109:
pszUOMName = "microradian";
dfInDegrees = 180.0 / (PI * 1000000.0);
break;
default:
break;
}
if (pszUOMName)
{
if( ppszUOMName != NULL )
{
if( pszUOMName != NULL )
*ppszUOMName = CPLStrdup( pszUOMName );
else
*ppszUOMName = NULL;
}
if( pdfInDegrees != NULL )
*pdfInDegrees = dfInDegrees;
return TRUE;
}
pszFilename = CSVFilename( "unit_of_measure.csv" );
sprintf( szSearchKey, "%d", nUOMAngleCode );
pszUOMName = CSVGetField( pszFilename,
"UOM_CODE", szSearchKey, CC_Integer,
"UNIT_OF_MEAS_NAME" );
/* -------------------------------------------------------------------- */
/* If the file is found, read from there. Note that FactorC is */
/* an empty field for any of the DMS style formats, and in this */
/* case we really want to return the default InDegrees value */
/* (1.0) from above. */
/* -------------------------------------------------------------------- */
if( pszUOMName != NULL )
{
double dfFactorB, dfFactorC, dfInRadians;
dfFactorB =
GTIFAtof(CSVGetField( pszFilename,
"UOM_CODE", szSearchKey, CC_Integer,
"FACTOR_B" ));
dfFactorC =
GTIFAtof(CSVGetField( pszFilename,
"UOM_CODE", szSearchKey, CC_Integer,
"FACTOR_C" ));
if( dfFactorC != 0.0 )
{
dfInRadians = (dfFactorB / dfFactorC);
dfInDegrees = dfInRadians * 180.0 / PI;
}
}
else
{
return FALSE;
}
/* -------------------------------------------------------------------- */
/* Return to caller. */
/* -------------------------------------------------------------------- */
if( ppszUOMName != NULL )
{
if( pszUOMName != NULL )
*ppszUOMName = CPLStrdup( pszUOMName );
else
*ppszUOMName = NULL;
}
if( pdfInDegrees != NULL )
*pdfInDegrees = dfInDegrees;
return( TRUE );
}
/************************************************************************/
/* EPSGProjMethodToCTProjMethod() */
/* */
/* Convert between the EPSG enumeration for projection methods, */
/* and the GeoTIFF CT codes. */
/************************************************************************/
static int EPSGProjMethodToCTProjMethod( int nEPSG )
{
/* see trf_method.csv for list of EPSG codes */
switch( nEPSG )
{
case 9801:
return( CT_LambertConfConic_1SP );
case 9802:
return( CT_LambertConfConic_2SP );
case 9803:
return( CT_LambertConfConic_2SP ); /* Belgian variant not supported */
case 9804:
return( CT_Mercator ); /* 1SP and 2SP not differentiated */
case 9805:
return( CT_Mercator ); /* 1SP and 2SP not differentiated */
/* Mercator 1SP (Spherical) For EPSG:3785 */
case 9841:
return( CT_Mercator ); /* 1SP and 2SP not differentiated */
/* Google Mercator For EPSG:3857 */
case 1024:
return( CT_Mercator ); /* 1SP and 2SP not differentiated */
case 9806:
return( CT_CassiniSoldner );