ogr_srs_proj4.cpp

在linux环境下

/******************************************************************************
 * $Id: ogr_srs_proj4.cpp,v 1.44 2003/06/27 19:02:04 warmerda Exp $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  OGRSpatialReference interface to PROJ.4.
 * Author:   Frank Warmerdam, [e-mail]
 *
 ******************************************************************************
 * Copyright (c) 1999,  Les Technologies SoftMap Inc.
 *
 * 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.
 ******************************************************************************
 *
 * $Log: ogr_srs_proj4.cpp,v $
 * Revision 1.44  2003/06/27 19:02:04  warmerda
 * added OSRProj4Tokenize(), fixes plus related tokenizing bug in bug 355
 *
 * Revision 1.43  2003/06/27 17:54:12  warmerda
 * allow k_0 in place of k parsing proj4, bug 355
 *
 * Revision 1.42  2003/06/21 23:25:03  warmerda
 * added +towgs84 support in importFromProj4()
 *
 * Revision 1.41  2003/05/28 18:17:38  warmerda
 * treat meter or m as meter
 *
 * Revision 1.40  2003/05/20 18:09:36  warmerda
 * fixed so that importFromProj4() will transform linear parameter units
 *
 * Revision 1.39  2003/02/13 19:27:28  warmerda
 * always append no_defs to avoid getting hosted by defaults file
 *
 * Revision 1.38  2002/12/15 23:42:59  warmerda
 * added initial support for normalizing proj params
 *
 * Revision 1.37  2002/12/14 19:50:21  warmerda
 * implement support for NZMG (New Zealand Map Grid)
 *
 * Revision 1.36  2002/12/10 04:05:04  warmerda
 * fixed some translation problems with prime meridians
 *
 * Revision 1.35  2002/12/09 23:03:45  warmerda
 * Fixed translation of paris prime meridian.
 *
 * Revision 1.34  2002/12/09 18:55:07  warmerda
 * moved DMS stuff to gdal/port
 *
 * Revision 1.33  2002/12/09 16:12:14  warmerda
 * added +pm= support
 *
 * Revision 1.32  2002/12/03 15:38:10  warmerda
 * dont write linear units to geograpic srs but avoid freaking out
 *
 * Revision 1.31  2002/12/01 20:19:21  warmerda
 * use %.16g to preserve precision as per bug 184
 *
 * Revision 1.30  2002/11/29 21:23:38  warmerda
 * implement LCC1SP PROJ.4 to WKT translation
 *
 * Revision 1.29  2002/11/29 20:56:37  warmerda
 * added LCC1SP conversion to PROJ.4, missing reverse
 *
 * Revision 1.28  2002/11/25 03:28:16  warmerda
 * added/improved documentation
 *
 * Revision 1.27  2002/07/09 14:49:07  warmerda
 * Improved translation from/to polar stereographic as per
 * http://bugzilla.remotesensing.org/show_bug.cgi?id=172
 *
 * Revision 1.26  2002/06/11 18:02:03  warmerda
 * add PROJ.4 normalization and EPSG support
 *
 * Revision 1.25  2002/04/18 14:22:45  warmerda
 * made OGRSpatialReference and co 'const correct'
 *
 * Revision 1.24  2002/03/08 20:17:52  warmerda
 * assume WGS84 if ellipse info missing
 *
 * Revision 1.23  2002/01/18 04:48:48  warmerda
 * clean tabs, and newlines from input to importProj4
 *
 * Revision 1.22  2001/12/12 20:18:06  warmerda
 * added support for units in proj.4 to WKT
 *
 * Revision 1.21  2001/11/07 22:08:51  warmerda
 * dont put + in to_meter value
 *
 * Revision 1.20  2001/11/02 22:21:15  warmerda
 * fixed memory leak
 *
 * Revision 1.19  2001/10/11 19:23:30  warmerda
 * fixed datum names
 *
 * Revision 1.18  2001/07/18 05:03:05  warmerda
 * added CPL_CVSID
 *
 * Revision 1.17  2001/03/02 04:37:43  danmo
 * Return empty string for LOCAL_CS in exportToProj4().
 *
 * Revision 1.16  2001/01/22 14:00:28  warmerda
 * added untested support for Swiss Oblique Cylindrical
 *
 * Revision 1.15  2001/01/19 21:10:46  warmerda
 * replaced tabs
 *
 * Revision 1.14  2000/12/05 23:10:34  warmerda
 * Added cassini support
 *
 * Revision 1.13  2000/12/05 17:46:16  warmerda
 * Use +R_A for VanDerGrinten and miller
 *
 * Revision 1.12  2000/09/25 20:22:21  warmerda
 * ensure pszPROJ4Units is initialized
 *
 * Revision 1.11  2000/09/25 15:46:56  warmerda
 * added sphere
 *
 * Revision 1.10  2000/08/28 20:13:23  warmerda
 * added importFromProj4
 *
 * Revision 1.9  2000/07/11 01:02:06  warmerda
 * added ExportToProj4()
 *
 * Revision 1.8  2000/07/09 20:49:21  warmerda
 * added +datum support
 *
 * Revision 1.7  2000/03/06 02:23:54  warmerda
 * don't use +datum syntax
 *
 * Revision 1.6  1999/12/22 15:39:43  warmerda
 * fix to differentiate WGS variants
 *
 * Revision 1.5  1999/12/13 16:29:59  warmerda
 * Added improved units, and ellipse support.
 *
 * Revision 1.4  1999/12/08 16:34:05  warmerda
 * added five or six more projections
 *
 * Revision 1.1  1999/07/29 17:29:15  warmerda
 * New
 *
 */

#include "ogr_spatialref.h"
#include "ogr_p.h"
#include "cpl_conv.h"

CPL_CVSID("$Id: ogr_srs_proj4.cpp,v 1.44 2003/06/27 19:02:04 warmerda Exp $");

/* -------------------------------------------------------------------- */
/*      The following list comes from osrs/proj/src/pj_ellps.c          */
/*      ... please update from time to time.                            */
/* -------------------------------------------------------------------- */
static const char *ogr_pj_ellps[] = {
"MERIT",        "a=6378137.0", "rf=298.257", "MERIT 1983",
"SGS85",        "a=6378136.0", "rf=298.257",  "Soviet Geodetic System 85",
"GRS80",        "a=6378137.0", "rf=298.257222101", "GRS 1980(IUGG, 1980)",
"IAU76",        "a=6378140.0", "rf=298.257", "IAU 1976",
"airy",         "a=6377563.396", "b=6356256.910", "Airy 1830",
"APL4.9",       "a=6378137.0.",  "rf=298.25", "Appl. Physics. 1965",
"NWL9D",        "a=6378145.0.",  "rf=298.25", "Naval Weapons Lab., 1965",
"mod_airy",     "a=6377340.189", "b=6356034.446", "Modified Airy",
"andrae",       "a=6377104.43",  "rf=300.0",    "Andrae 1876 (Den., Iclnd.)",
"aust_SA",      "a=6378160.0", "rf=298.25", "Australian Natl & S. Amer. 1969",
"GRS67",        "a=6378160.0", "rf=298.2471674270", "GRS 67(IUGG 1967)",
"bessel",       "a=6377397.155", "rf=299.1528128", "Bessel 1841",
"bess_nam",     "a=6377483.865", "rf=299.1528128", "Bessel 1841 (Namibia)",
"clrk66",       "a=6378206.4", "b=6356583.8", "Clarke 1866",
"clrk80",       "a=6378249.145", "rf=293.4663", "Clarke 1880 mod.",
"CPM",          "a=6375738.7", "rf=334.29", "Comm. des Poids et Mesures 1799",
"delmbr",       "a=6376428.",  "rf=311.5", "Delambre 1810 (Belgium)",
"engelis",      "a=6378136.05", "rf=298.2566", "Engelis 1985",
"evrst30",  "a=6377276.345", "rf=300.8017",  "Everest 1830",
"evrst48",  "a=6377304.063", "rf=300.8017",  "Everest 1948",
"evrst56",  "a=6377301.243", "rf=300.8017",  "Everest 1956",
"evrst69",  "a=6377295.664", "rf=300.8017",  "Everest 1969",
"evrstSS",  "a=6377298.556", "rf=300.8017",  "Everest (Sabah & Sarawak)",
"fschr60",  "a=6378166.",   "rf=298.3", "Fischer (Mercury Datum) 1960",
"fschr60m", "a=6378155.",   "rf=298.3", "Modified Fischer 1960",
"fschr68",  "a=6378150.",   "rf=298.3", "Fischer 1968",
"helmert",  "a=6378200.",   "rf=298.3", "Helmert 1906",
"hough",        "a=6378270.0", "rf=297.", "Hough",
"intl",         "a=6378388.0", "rf=297.", "International 1909 (Hayford)",
"krass",        "a=6378245.0", "rf=298.3", "Krassovsky, 1942",
"kaula",        "a=6378163.",  "rf=298.24", "Kaula 1961",
"lerch",        "a=6378139.",  "rf=298.257", "Lerch 1979",
"mprts",        "a=6397300.",  "rf=191.", "Maupertius 1738",
"new_intl",     "a=6378157.5", "b=6356772.2", "New International 1967",
"plessis",      "a=6376523.",  "b=6355863.", "Plessis 1817 (France)",
"SEasia",       "a=6378155.0", "b=6356773.3205", "Southeast Asia",
"walbeck",      "a=6376896.0", "b=6355834.8467", "Walbeck",
"WGS60",    "a=6378165.0",  "rf=298.3", "WGS 60",
"WGS66",        "a=6378145.0", "rf=298.25", "WGS 66",
"WGS72",        "a=6378135.0", "rf=298.26", "WGS 72",
"WGS84",    "a=6378137.0",  "rf=298.257223563", "WGS 84",
"sphere",   "a=6370997.0",  "b=6370997.0", "Normal Sphere (r=6370997)",
0, 0, 0, 0,
};

/************************************************************************/
/*                          OSRProj4Tokenize()                          */
/*                                                                      */
/*      Custom tokenizing function for PROJ.4 strings.  The main        */
/*      reason we can't just use CSLTokenizeString is to handle         */
/*      strings with a + sign in the exponents of parameter values.     */
/************************************************************************/

char **OSRProj4Tokenize( const char *pszFull )

{
    char *pszStart = NULL;
    char *pszFullWrk;
    char **papszTokens = NULL;
    int  i;

    if( pszFull == NULL )
        return NULL;

    pszFullWrk = CPLStrdup( pszFull );

    for( i=0; pszFullWrk[i] != '\0'; i++ )
    {
        switch( pszFullWrk[i] )
        {
          case '+':
            if( i == 0 || pszFullWrk[i-1] == '\0' )
            {
                if( pszStart != NULL )
                    papszTokens = CSLAddString( papszTokens, pszStart );
                pszStart = pszFullWrk + i + 1;
            }
            break;

          case ' ':
          case '\t':
          case '\n':
            pszFullWrk[i] = '\0';
            break;

          default:
            break;
        }
    }

    if( pszStart != NULL && strlen(pszStart) > 0 )
        papszTokens = CSLAddString( papszTokens, pszStart );

    CPLFree( pszFullWrk );

    return papszTokens;
}


/************************************************************************/
/*                         OSRImportFromProj4()                         */
/************************************************************************/

OGRErr OSRImportFromProj4( OGRSpatialReferenceH hSRS, const char *pszProj4 )

{
    return ((OGRSpatialReference *) hSRS)->importFromProj4( pszProj4 );
}

/************************************************************************/
/*                              OSR_GDV()                               */
/*                                                                      */
/*      Fetch a particular parameter out of the parameter list, or      */
/*      the indicated default if it isn't available.  This is a         */
/*      helper function for importFromProj4().                          */
/************************************************************************/

static double OSR_GDV( char **papszNV, const char * pszField, 
                       double dfDefaultValue )

{
    const char * pszValue;

    pszValue = CSLFetchNameValue( papszNV, pszField );

    // special hack to use k_0 if available.
    if( pszValue == NULL && EQUAL(pszField,"k") )
        pszValue = CSLFetchNameValue( papszNV, "k_0" );

    if( pszValue == NULL )
        return dfDefaultValue;
    else
        return CPLDMSToDec(pszValue);
}

/************************************************************************/
/*                          importFromProj4()                           */
/************************************************************************/

/**
 * Import PROJ.4 coordinate string.
 *
 * The OGRSpatialReference is initialized from the passed PROJ.4 style
 * coordinate system string.  In addition to many +proj formulations which
 * have OGC equivelents, it is also possible to import "+init=epsg:n" style
 * definitions.  These are passed to importFromEPSG().  Other init strings
 * (such as the state plane zones) are not currently supported.   
 *
 * Example:
 *   pszProj4 = "+proj=utm +zone=11 +datum=WGS84" 
 *
 * This method is the equivelent of the C function OSRImportFromProj4().
 *
 * @param pszProj4 the PROJ.4 style string. 
 *
 * @return OGRERR_NONE on success or OGRERR_CORRUPT_DATA on failure.
 */

OGRErr OGRSpatialReference::importFromProj4( const char * pszProj4 )

{
    char **papszNV = NULL;
    char **papszTokens;
    int  i;
    char *pszCleanCopy;

/* -------------------------------------------------------------------- */
/*      Strip any newlines or other "funny" stuff that might occur      */
/*      if this string just came from reading a file.                   */
/* -------------------------------------------------------------------- */
    pszCleanCopy = CPLStrdup( pszProj4 );
    for( i = 0; pszCleanCopy[i] != '\0'; i++ )
    {
        if( pszCleanCopy[i] == 10 
            || pszCleanCopy[i] == 13 
            || pszCleanCopy[i] == 9 )
            pszCleanCopy[i] = ' ';
    }

/* -------------------------------------------------------------------- */
/*      Try to normalize the definition.  This should expand +init=     */
/*      clauses and so forth.                                           */
/* -------------------------------------------------------------------- */
    char *pszNormalized;

    pszNormalized = OCTProj4Normalize( pszCleanCopy );
    CPLFree( pszCleanCopy );
    
/* -------------------------------------------------------------------- */
/*      If we have an EPSG based init string, try to process it         */
/*      directly to get the fullest possible EPSG definition.           */
/* -------------------------------------------------------------------- */
    if( strstr(pszNormalized,"init=epsg:") != NULL )
    {
        OGRErr eErr;
        const char *pszNumber = strstr(pszNormalized,"init=epsg:") + 10;

        eErr = importFromEPSG( atoi(pszNumber) );
        if( eErr == OGRERR_NONE )
        {
            CPLFree( pszNormalized );
            return eErr;
        }
    }

/* -------------------------------------------------------------------- */
/*      Parse the PROJ.4 string into a cpl_string.h style name/value    */
/*      list.                                                           */
/* -------------------------------------------------------------------- */
    papszTokens = OSRProj4Tokenize( pszNormalized );
    CPLFree( pszNormalized );
    
    for( i = 0; papszTokens != NULL && papszTokens[i] != NULL; i++ )
    {
        char *pszEqual = strstr(papszTokens[i],"=");

        if( pszEqual == NULL )
            papszNV = CSLAddNameValue(papszNV, papszTokens[i], "" );
        else
        {
            pszEqual[0] = '\0';
            papszNV = CSLAddNameValue( papszNV, papszTokens[i], pszEqual+1 );
        }
    }

    CSLDestroy( papszTokens );

/* -------------------------------------------------------------------- */
/*      Operate on the basis of the projection name.                    */
/* -------------------------------------------------------------------- */
    const char *pszProj = CSLFetchNameValue(papszNV,"proj");

    if( pszProj == NULL )
    {
        CPLDebug( "OGR_PROJ4", "Can't find +proj= in:\n%s", pszProj4 );
        CSLDestroy( papszNV );
        return OGRERR_CORRUPT_DATA;
    }

    else if( EQUAL(pszProj,"longlat") || EQUAL(pszProj,"latlong") )
    {