File: ogr_spatialref.h

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/******************************************************************************
 * $Id: ogr_spatialref.h 26289 2013-08-10 18:05:31Z rouault $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  Classes for manipulating spatial reference systems in a
 *           platform non-specific manner.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * 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.
 ****************************************************************************/

#ifndef _OGR_SPATIALREF_H_INCLUDED
#define _OGR_SPATIALREF_H_INCLUDED

#include "ogr_srs_api.h"

/**
 * \file ogr_spatialref.h
 *
 * Coordinate systems services.
 */

/************************************************************************/
/*                             OGR_SRSNode                              */
/************************************************************************/

/**
 * Objects of this class are used to represent value nodes in the parsed
 * representation of the WKT SRS format.  For instance UNIT["METER",1]
 * would be rendered into three OGR_SRSNodes.  The root node would have a
 * value of UNIT, and two children, the first with a value of METER, and the
 * second with a value of 1.
 *
 * Normally application code just interacts with the OGRSpatialReference
 * object, which uses the OGR_SRSNode to implement it's data structure;
 * however, this class is user accessable for detailed access to components
 * of an SRS definition.
 */

class CPL_DLL OGR_SRSNode
{
    char        *pszValue;

    OGR_SRSNode **papoChildNodes;
    OGR_SRSNode *poParent;

    int         nChildren;

    int         NeedsQuoting() const;
    OGRErr      importFromWkt( char **, int nRecLevel, int* pnNodes );
    
  public:
                OGR_SRSNode(const char * = NULL);
                ~OGR_SRSNode();

    int         IsLeafNode() const { return nChildren == 0; }
    
    int         GetChildCount() const { return nChildren; }
    OGR_SRSNode *GetChild( int );
    const OGR_SRSNode *GetChild( int ) const;

    OGR_SRSNode *GetNode( const char * );
    const OGR_SRSNode *GetNode( const char * ) const;

    void        InsertChild( OGR_SRSNode *, int );
    void        AddChild( OGR_SRSNode * );
    int         FindChild( const char * ) const;
    void        DestroyChild( int );
    void        ClearChildren();
    void        StripNodes( const char * );

    const char  *GetValue() const { return pszValue; }
    void        SetValue( const char * );

    void        MakeValueSafe();
    OGRErr      FixupOrdering();

    OGR_SRSNode *Clone() const;

    OGRErr      importFromWkt( char ** );
    OGRErr      exportToWkt( char ** ) const;
    OGRErr      exportToPrettyWkt( char **, int = 1) const;
    
    OGRErr      applyRemapper( const char *pszNode, 
                               char **papszSrcValues, 
                               char **papszDstValues, 
                               int nStepSize = 1,
                               int bChildOfHit = FALSE );
};

/************************************************************************/
/*                         OGRSpatialReference                          */
/************************************************************************/

/**
 * This class respresents a OpenGIS Spatial Reference System, and contains
 * methods for converting between this object organization and well known
 * text (WKT) format.  This object is reference counted as one instance of
 * the object is normally shared between many OGRGeometry objects.
 *
 * Normally application code can fetch needed parameter values for this
 * SRS using GetAttrValue(), but in special cases the underlying parse tree
 * (or OGR_SRSNode objects) can be accessed more directly.
 *
 * See <a href="osr_tutorial.html">the tutorial</a> for more information on
 * how to use this class.
 */

class CPL_DLL OGRSpatialReference
{
    double      dfFromGreenwich;
    double      dfToMeter;
    double      dfToDegrees;

    OGR_SRSNode *poRoot;

    int         nRefCount;
    int         bNormInfoSet;

    static OGRErr Validate(OGR_SRSNode *poRoot);
    static OGRErr ValidateAuthority(OGR_SRSNode *poRoot);
    static OGRErr ValidateAxis(OGR_SRSNode *poRoot);
    static OGRErr ValidateUnit(OGR_SRSNode *poRoot);
    static OGRErr ValidateVertDatum(OGR_SRSNode *poRoot);
    static OGRErr ValidateProjection( OGR_SRSNode* poRoot );
    static int  IsAliasFor( const char *, const char * );
    void        GetNormInfo() const;

    OGRErr      importFromURNPart(const char* pszAuthority,
                                  const char* pszCode,
                                  const char* pszURN);
  public:
                OGRSpatialReference(const OGRSpatialReference&);
                OGRSpatialReference(const char * = NULL);
                
    virtual    ~OGRSpatialReference();
    
    static void DestroySpatialReference(OGRSpatialReference* poSRS);
                
    OGRSpatialReference &operator=(const OGRSpatialReference&);

    int         Reference();
    int         Dereference();
    int         GetReferenceCount() const { return nRefCount; }
    void        Release();

    OGRSpatialReference *Clone() const;
    OGRSpatialReference *CloneGeogCS() const;

    void        dumpReadable();
    OGRErr      exportToWkt( char ** ) const;
    OGRErr      exportToPrettyWkt( char **, int = FALSE) const;
    OGRErr      exportToProj4( char ** ) const;
    OGRErr      exportToPCI( char **, char **, double ** ) const;
    OGRErr      exportToUSGS( long *, long *, double **, long * ) const;
    OGRErr      exportToXML( char **, const char * = NULL ) const;
    OGRErr      exportToPanorama( long *, long *, long *, long *,
                                  double * ) const;
    OGRErr      exportToERM( char *pszProj, char *pszDatum, char *pszUnits );
    OGRErr      exportToMICoordSys( char ** ) const;
    
    OGRErr      importFromWkt( char ** );
    OGRErr      importFromProj4( const char * );
    OGRErr      importFromEPSG( int );
    OGRErr      importFromEPSGA( int );
    OGRErr      importFromESRI( char ** );
    OGRErr      importFromPCI( const char *, const char * = NULL,
                               double * = NULL );
#define USGS_ANGLE_DECIMALDEGREES 0
#define USGS_ANGLE_PACKEDDMS      TRUE /* 1 */
#define USGS_ANGLE_RADIANS        2
    OGRErr      importFromUSGS( long iProjSys, long iZone,
                                double *padfPrjParams, long iDatum, 
                                int nUSGSAngleFormat = USGS_ANGLE_PACKEDDMS );
    OGRErr      importFromPanorama( long, long, long, double* );
    OGRErr      importFromOzi( const char *, const char *, const char * );
    OGRErr      importFromOzi( const char * const* papszLines );
    OGRErr      importFromWMSAUTO( const char *pszAutoDef );
    OGRErr      importFromXML( const char * );
    OGRErr      importFromDict( const char *pszDict, const char *pszCode );
    OGRErr      importFromURN( const char * );
    OGRErr      importFromCRSURL( const char * );
    OGRErr      importFromERM( const char *pszProj, const char *pszDatum,
                               const char *pszUnits );
    OGRErr      importFromUrl( const char * );
    OGRErr      importFromMICoordSys( const char * );
    
    OGRErr      morphToESRI();
    OGRErr      morphFromESRI();

    OGRErr      Validate();
    OGRErr      StripCTParms( OGR_SRSNode * = NULL );
    OGRErr      StripVertical();
    OGRErr      FixupOrdering();
    OGRErr      Fixup();

    int         EPSGTreatsAsLatLong();
    int         EPSGTreatsAsNorthingEasting();
    const char *GetAxis( const char *pszTargetKey, int iAxis, 
                         OGRAxisOrientation *peOrientation ) const;
    OGRErr      SetAxes( const char *pszTargetKey, 
                         const char *pszXAxisName, 
                         OGRAxisOrientation eXAxisOrientation,
                         const char *pszYAxisName, 
                         OGRAxisOrientation eYAxisOrientation );

    // Machinary for accessing parse nodes
    OGR_SRSNode *GetRoot() { return poRoot; }
    const OGR_SRSNode *GetRoot() const { return poRoot; }
    void        SetRoot( OGR_SRSNode * );
    
    OGR_SRSNode *GetAttrNode(const char *);
    const OGR_SRSNode *GetAttrNode(const char *) const;
    const char  *GetAttrValue(const char *, int = 0) const;

    OGRErr      SetNode( const char *, const char * );
    OGRErr      SetNode( const char *, double );

    OGRErr      SetLinearUnitsAndUpdateParameters( const char *pszName, 
                                                   double dfInMeters );
    OGRErr      SetLinearUnits( const char *pszName, double dfInMeters );
    OGRErr      SetTargetLinearUnits( const char *pszTargetKey,
                                      const char *pszName, double dfInMeters );
    double      GetLinearUnits( char ** = NULL ) const;
    double      GetTargetLinearUnits( const char *pszTargetKey,
                                      char ** ppszRetName = NULL ) const;

    OGRErr      SetAngularUnits( const char *pszName, double dfInRadians );
    double      GetAngularUnits( char ** = NULL ) const;

    double      GetPrimeMeridian( char ** = NULL ) const;

    int         IsGeographic() const;
    int         IsProjected() const;
    int         IsGeocentric() const;
    int         IsLocal() const;
    int         IsVertical() const;
    int         IsCompound() const;
    int         IsSameGeogCS( const OGRSpatialReference * ) const;
    int         IsSameVertCS( const OGRSpatialReference * ) const;
    int         IsSame( const OGRSpatialReference * ) const;

    void        Clear();
    OGRErr      SetLocalCS( const char * );
    OGRErr      SetProjCS( const char * );
    OGRErr      SetProjection( const char * );
    OGRErr      SetGeocCS( const char * pszGeocName );
    OGRErr      SetGeogCS( const char * pszGeogName,
                           const char * pszDatumName,
                           const char * pszEllipsoidName,
                           double dfSemiMajor, double dfInvFlattening,
                           const char * pszPMName = NULL,
                           double dfPMOffset = 0.0,
                           const char * pszUnits = NULL,
                           double dfConvertToRadians = 0.0 );
    OGRErr      SetWellKnownGeogCS( const char * );
    OGRErr      CopyGeogCSFrom( const OGRSpatialReference * poSrcSRS );
    OGRErr      SetVertCS( const char *pszVertCSName,
                           const char *pszVertDatumName, 
                           int nVertDatumClass = 2005 );
    OGRErr      SetCompoundCS( const char *pszName, 
                               const OGRSpatialReference *poHorizSRS,
                               const OGRSpatialReference *poVertSRS );

    OGRErr      SetFromUserInput( const char * );

    OGRErr      SetTOWGS84( double, double, double,
                            double = 0.0, double = 0.0, double = 0.0,
                            double = 0.0 );
    OGRErr      GetTOWGS84( double *padfCoef, int nCoeff = 7 ) const;
    
    double      GetSemiMajor( OGRErr * = NULL ) const;
    double      GetSemiMinor( OGRErr * = NULL ) const;
    double      GetInvFlattening( OGRErr * = NULL ) const;

    OGRErr      SetAuthority( const char * pszTargetKey, 
                              const char * pszAuthority, 
                              int nCode );

    OGRErr      AutoIdentifyEPSG();
    int         GetEPSGGeogCS();

    const char *GetAuthorityCode( const char * pszTargetKey ) const;
    const char *GetAuthorityName( const char * pszTargetKey ) const;

    const char *GetExtension( const char *pszTargetKey, 
                              const char *pszName,
                              const char *pszDefault = NULL ) const;
    OGRErr      SetExtension( const char *pszTargetKey, 
                              const char *pszName, 
                              const char *pszValue );
    
    int         FindProjParm( const char *pszParameter,
                              const OGR_SRSNode *poPROJCS=NULL ) const;
    OGRErr      SetProjParm( const char *, double );
    double      GetProjParm( const char *, double =0.0, OGRErr* = NULL ) const;

    OGRErr      SetNormProjParm( const char *, double );
    double      GetNormProjParm( const char *, double=0.0, OGRErr* =NULL)const;

    static int  IsAngularParameter( const char * );
    static int  IsLongitudeParameter( const char * );
    static int  IsLinearParameter( const char * );

    /** Albers Conic Equal Area */
    OGRErr      SetACEA( double dfStdP1, double dfStdP2,
                         double dfCenterLat, double dfCenterLong,
                         double dfFalseEasting, double dfFalseNorthing );
    
    /** Azimuthal Equidistant */
    OGRErr      SetAE( double dfCenterLat, double dfCenterLong,
                       double dfFalseEasting, double dfFalseNorthing );

    /** Bonne */
    OGRErr      SetBonne( double dfStdP1, double dfCentralMeridian,
                          double dfFalseEasting, double dfFalseNorthing );
    
    /** Cylindrical Equal Area */
    OGRErr      SetCEA( double dfStdP1, double dfCentralMeridian,
                        double dfFalseEasting, double dfFalseNorthing );

    /** Cassini-Soldner */
    OGRErr      SetCS( double dfCenterLat, double dfCenterLong,
                       double dfFalseEasting, double dfFalseNorthing );

    /** Equidistant Conic */
    OGRErr      SetEC( double dfStdP1, double dfStdP2,
                       double dfCenterLat, double dfCenterLong,
                       double dfFalseEasting, double dfFalseNorthing );

    /** Eckert I-VI */
    OGRErr      SetEckert( int nVariation, double dfCentralMeridian,
                           double dfFalseEasting, double dfFalseNorthing );

    OGRErr      SetEckertIV( double dfCentralMeridian,
                             double dfFalseEasting, double dfFalseNorthing );

    OGRErr      SetEckertVI( double dfCentralMeridian,
                             double dfFalseEasting, double dfFalseNorthing );

    /** Equirectangular */
    OGRErr      SetEquirectangular(double dfCenterLat, double dfCenterLong,
                            double dfFalseEasting, double dfFalseNorthing );
    /** Equirectangular generalized form : */
    OGRErr      SetEquirectangular2( double dfCenterLat, double dfCenterLong,
                                     double dfPseudoStdParallel1,
                                     double dfFalseEasting, double dfFalseNorthing );

    /** Geostationary Satellite */
    OGRErr      SetGEOS( double dfCentralMeridian, double dfSatelliteHeight, 
                         double dfFalseEasting, double dfFalseNorthing );

    /** Goode Homolosine */
    OGRErr      SetGH( double dfCentralMeridian, 
                       double dfFalseEasting, double dfFalseNorthing );

    /** Interrupted Goode Homolosine */
    OGRErr      SetIGH();

    /** Gall Stereograpic */
    OGRErr      SetGS( double dfCentralMeridian,
                       double dfFalseEasting, double dfFalseNorthing );
 
    /** Gauss Schreiber Transverse Mercator */
    OGRErr      SetGaussSchreiberTMercator(double dfCenterLat, double dfCenterLong,
                                           double dfScale,
                                           double dfFalseEasting, double dfFalseNorthing );

    /** Gnomonic */
    OGRErr      SetGnomonic(double dfCenterLat, double dfCenterLong,
                            double dfFalseEasting, double dfFalseNorthing );

    /** Hotine Oblique Mercator */
    OGRErr      SetHOM( double dfCenterLat, double dfCenterLong,
                        double dfAzimuth, double dfRectToSkew,
                        double dfScale,
                        double dfFalseEasting, double dfFalseNorthing );

    OGRErr      SetHOM2PNO( double dfCenterLat,
                            double dfLat1, double dfLong1,
                            double dfLat2, double dfLong2,
                            double dfScale,
                            double dfFalseEasting, double dfFalseNorthing );

    OGRErr      SetOM( double dfCenterLat, double dfCenterLong,
                       double dfAzimuth, double dfRectToSkew,
                       double dfScale,
                       double dfFalseEasting, double dfFalseNorthing );

    /** Hotine Oblique Mercator Azimuth Center / Variant B */
    OGRErr      SetHOMAC( double dfCenterLat, double dfCenterLong,
                          double dfAzimuth, double dfRectToSkew,
                          double dfScale,
                          double dfFalseEasting, double dfFalseNorthing );

    /** International Map of the World Polyconic */
    OGRErr      SetIWMPolyconic( double dfLat1, double dfLat2,
                                 double dfCenterLong,
                                 double dfFalseEasting,
                                 double dfFalseNorthing );

    /** Krovak Oblique Conic Conformal */
    OGRErr      SetKrovak( double dfCenterLat, double dfCenterLong,
                           double dfAzimuth, double dfPseudoStdParallelLat,
                           double dfScale, 
                           double dfFalseEasting, double dfFalseNorthing );

    /** Lambert Azimuthal Equal-Area */
    OGRErr      SetLAEA( double dfCenterLat, double dfCenterLong,
                         double dfFalseEasting, double dfFalseNorthing );

    /** Lambert Conformal Conic */
    OGRErr      SetLCC( double dfStdP1, double dfStdP2,
                        double dfCenterLat, double dfCenterLong,
                        double dfFalseEasting, double dfFalseNorthing );

    /** Lambert Conformal Conic 1SP */
    OGRErr      SetLCC1SP( double dfCenterLat, double dfCenterLong,
                           double dfScale,
                           double dfFalseEasting, double dfFalseNorthing );

    /** Lambert Conformal Conic (Belgium) */
    OGRErr      SetLCCB( double dfStdP1, double dfStdP2,
                         double dfCenterLat, double dfCenterLong,
                         double dfFalseEasting, double dfFalseNorthing );
    
    /** Miller Cylindrical */
    OGRErr      SetMC( double dfCenterLat, double dfCenterLong,
                       double dfFalseEasting, double dfFalseNorthing );

    /** Mercator */
    OGRErr      SetMercator( double dfCenterLat, double dfCenterLong,
                             double dfScale, 
                             double dfFalseEasting, double dfFalseNorthing );

    OGRErr      SetMercator2SP( double dfStdP1,
                                double dfCenterLat, double dfCenterLong,
                                double dfFalseEasting, double dfFalseNorthing );

    /** Mollweide */
    OGRErr      SetMollweide( double dfCentralMeridian,
                              double dfFalseEasting, double dfFalseNorthing );

    /** New Zealand Map Grid */
    OGRErr      SetNZMG( double dfCenterLat, double dfCenterLong,
                         double dfFalseEasting, double dfFalseNorthing );

    /** Oblique Stereographic */
    OGRErr      SetOS( double dfOriginLat, double dfCMeridian,
                       double dfScale,
                       double dfFalseEasting,double dfFalseNorthing);
    
    /** Orthographic */
    OGRErr      SetOrthographic( double dfCenterLat, double dfCenterLong,
                                 double dfFalseEasting,double dfFalseNorthing);

    /** Polyconic */
    OGRErr      SetPolyconic( double dfCenterLat, double dfCenterLong,
                              double dfFalseEasting, double dfFalseNorthing );

    /** Polar Stereographic */
    OGRErr      SetPS( double dfCenterLat, double dfCenterLong,
                       double dfScale,
                       double dfFalseEasting, double dfFalseNorthing);
    
    /** Robinson */
    OGRErr      SetRobinson( double dfCenterLong, 
                             double dfFalseEasting, double dfFalseNorthing );
    
    /** Sinusoidal */
    OGRErr      SetSinusoidal( double dfCenterLong, 
                               double dfFalseEasting, double dfFalseNorthing );
    
    /** Stereographic */
    OGRErr      SetStereographic( double dfCenterLat, double dfCenterLong,
                                  double dfScale,
                                 double dfFalseEasting,double dfFalseNorthing);

    /** Swiss Oblique Cylindrical */
    OGRErr      SetSOC( double dfLatitudeOfOrigin, double dfCentralMeridian,
                        double dfFalseEasting, double dfFalseNorthing );
    
    /** Transverse Mercator */
    OGRErr      SetTM( double dfCenterLat, double dfCenterLong,
                       double dfScale,
                       double dfFalseEasting, double dfFalseNorthing );

    /** Transverse Mercator variants. */
    OGRErr      SetTMVariant( const char *pszVariantName, 
                              double dfCenterLat, double dfCenterLong,
                              double dfScale,
                              double dfFalseEasting, double dfFalseNorthing );

    /** Tunesia Mining Grid  */
    OGRErr      SetTMG( double dfCenterLat, double dfCenterLong, 
                        double dfFalseEasting, double dfFalseNorthing );

    /** Transverse Mercator (South Oriented) */
    OGRErr      SetTMSO( double dfCenterLat, double dfCenterLong,
                         double dfScale,
                         double dfFalseEasting, double dfFalseNorthing );

    /** Two Point Equidistant */
    OGRErr      SetTPED( double dfLat1, double dfLong1, 
                         double dfLat2, double dfLong2, 
                         double dfFalseEasting, double dfFalseNorthing );
    
    /** VanDerGrinten */
    OGRErr      SetVDG( double dfCenterLong,
                        double dfFalseEasting, double dfFalseNorthing );

    /** Universal Transverse Mercator */
    OGRErr      SetUTM( int nZone, int bNorth = TRUE );
    int         GetUTMZone( int *pbNorth = NULL ) const;

    /** Wagner I -- VII */
    OGRErr      SetWagner( int nVariation, double dfCenterLat,
                           double dfFalseEasting, double dfFalseNorthing );

    /** State Plane */
    OGRErr      SetStatePlane( int nZone, int bNAD83 = TRUE,
                               const char *pszOverrideUnitName = NULL,
                               double dfOverrideUnit = 0.0 );

    OGRErr      ImportFromESRIStatePlaneWKT( 
        int nCode, const char* pszDatumName, const char* pszUnitsName, 
        int nPCSCode, const char* pszCSName = 0 );
    OGRErr      ImportFromESRIWisconsinWKT( 
        const char* pszPrjName, double dfCentralMeridian, double dfLatOfOrigin, 
        const char* pszUnitsName, const char* pszCSName = 0 );
};

/************************************************************************/
/*                     OGRCoordinateTransformation                      */
/*                                                                      */
/*      This is really just used as a base class for a private          */
/*      implementation.                                                 */
/************************************************************************/

/**
 * Interface for transforming between coordinate systems.
 *
 * Currently, the only implementation within OGR is OGRProj4CT, which
 * requires the PROJ.4 library to be available at run-time.
 *
 * Also, see OGRCreateCoordinateTransformation() for creating transformations.
 */
 
class CPL_DLL OGRCoordinateTransformation
{
public:
    virtual ~OGRCoordinateTransformation() {}
    
    static void DestroyCT(OGRCoordinateTransformation* poCT);

    // From CT_CoordinateTransformation

    /** Fetch internal source coordinate system. */
    virtual OGRSpatialReference *GetSourceCS() = 0;

    /** Fetch internal target coordinate system. */
    virtual OGRSpatialReference *GetTargetCS() = 0;

    // From CT_MathTransform

    /**
     * Transform points from source to destination space.
     *
     * This method is the same as the C function OCTTransform().
     *
     * The method TransformEx() allows extended success information to 
     * be captured indicating which points failed to transform. 
     *
     * @param nCount number of points to transform.
     * @param x array of nCount X vertices, modified in place.
     * @param y array of nCount Y vertices, modified in place.
     * @param z array of nCount Z vertices, modified in place.
     * @return TRUE on success, or FALSE if some or all points fail to
     * transform.
     */
    virtual int Transform( int nCount, 
                           double *x, double *y, double *z = NULL ) = 0;

    /**
     * Transform points from source to destination space.
     *
     * This method is the same as the C function OCTTransformEx().
     *
     * @param nCount number of points to transform.
     * @param x array of nCount X vertices, modified in place.
     * @param y array of nCount Y vertices, modified in place.
     * @param z array of nCount Z vertices, modified in place.
     * @param pabSuccess array of per-point flags set to TRUE if that point 
     * transforms, or FALSE if it does not.
     *
     * @return TRUE if some or all points transform successfully, or FALSE if 
     * if none transform.
     */
    virtual int TransformEx( int nCount, 
                             double *x, double *y, double *z = NULL,
                             int *pabSuccess = NULL ) = 0;

};

OGRCoordinateTransformation CPL_DLL *
OGRCreateCoordinateTransformation( OGRSpatialReference *poSource, 
                                   OGRSpatialReference *poTarget );

#endif /* ndef _OGR_SPATIALREF_H_INCLUDED */