ogr_srs_esri.cpp

用于读取TAB、MIF、SHP文件的类

        int nGCSCode = -1;
        
        if( pszAuthName != NULL && EQUAL(pszAuthName,"EPSG") )
            nGCSCode = atoi(GetAuthorityCode("GEOGCS"));

        if( nGCSCode == 4326 
            || EQUAL(pszGeogCSName,"WGS84") 
            || EQUAL(pszGeogCSName,"WGS 84") )
        {
            poGeogCS->GetChild(0)->SetValue( "GCS_WGS_1984" );
            pszUTMPrefix = "WGS_1984";
        }
        else if( nGCSCode == 4267
                 || EQUAL(pszGeogCSName,"NAD27") 
                 || EQUAL(pszGeogCSName,"NAD 27") )
        {
            poGeogCS->GetChild(0)->SetValue( "GCS_North_American_1927" );
            pszUTMPrefix = "NAD_1927";
        }
        else if( nGCSCode == 4269
                 || EQUAL(pszGeogCSName,"NAD83") 
                 || EQUAL(pszGeogCSName,"NAD 83") )
        {
            poGeogCS->GetChild(0)->SetValue( "GCS_North_American_1983" );
            pszUTMPrefix = "NAD_1983";
        }

/* -------------------------------------------------------------------- */
/*      Force Unnamed to Unknown for most common locations.             */
/* -------------------------------------------------------------------- */
    static char *apszUnknownMapping[] = { 
        "Unknown", "Unnamed",
        NULL, NULL 
    };

    GetRoot()->applyRemapper( "PROJCS", 
                              apszUnknownMapping+1, apszUnknownMapping+0, 2 );
    GetRoot()->applyRemapper( "GEOGCS", 
                              apszUnknownMapping+1, apszUnknownMapping+0, 2 );
    GetRoot()->applyRemapper( "DATUM", 
                              apszUnknownMapping+1, apszUnknownMapping+0, 2 );
    GetRoot()->applyRemapper( "SPHEROID", 
                              apszUnknownMapping+1, apszUnknownMapping+0, 2 );
    GetRoot()->applyRemapper( "PRIMEM", 
                              apszUnknownMapping+1, apszUnknownMapping+0, 2 );
    
/* -------------------------------------------------------------------- */
/*      If the PROJCS name is unset, use the PROJECTION name in         */
/*      place of unknown, or unnamed.  At the request of Peng Gao.      */
/* -------------------------------------------------------------------- */
    OGR_SRSNode *poNode;

    poNode = GetAttrNode( "PROJCS" );
    if( poNode != NULL )
        poNode = poNode->GetChild( 0 );

    if( poNode != NULL 
        && ( EQUAL(poNode->GetValue(),"unnamed")
             || EQUAL(poNode->GetValue(),"unknown")
             || EQUAL(poNode->GetValue(),"") ) )
    {
        if( GetAttrValue( "PROJECTION", 0 ) != NULL )
            poNode->SetValue( GetAttrValue( "PROJECTION", 0 ) );
    }

/* -------------------------------------------------------------------- */
/*      Prepare very specific PROJCS names for UTM coordinate           */
/*      systems.                                                        */
/* -------------------------------------------------------------------- */
        int bNorth, nZone;

        nZone = GetUTMZone( &bNorth );
        if( nZone > 0 && pszUTMPrefix != NULL )
        {
            char szUTMName[128];

            if( bNorth )
                sprintf( szUTMName, "%s_UTM_Zone_%dN", pszUTMPrefix, nZone );
            else
                sprintf( szUTMName, "%s_UTM_Zone_%dS", pszUTMPrefix, nZone );
            
            OGR_SRSNode *poProjCS = GetAttrNode( "PROJCS" );
            if( poProjCS != NULL )
                poProjCS->GetChild(0)->SetValue( szUTMName );
        }
    }

/* -------------------------------------------------------------------- */
/*      Translate UNIT keywords that are misnamed, or even the wrong    */
/*      case.                                                           */
/* -------------------------------------------------------------------- */
    GetRoot()->applyRemapper( "UNIT", 
                              apszUnitMapping+1, apszUnitMapping, 2 );

/* -------------------------------------------------------------------- */
/*      reset constants for decimal degrees to the exact string ESRI    */
/*      expects when encountered to ensure a matchup.                   */
/* -------------------------------------------------------------------- */
    OGR_SRSNode *poUnit = GetAttrNode( "GEOGCS|UNIT" );
    
    if( poUnit != NULL && poUnit->GetChildCount() >= 2 
        && ABS(GetAngularUnits()-0.0174532925199433) < 0.00000000001 )
    {
        poUnit->GetChild(0)->SetValue("Degree");
        poUnit->GetChild(1)->SetValue("0.017453292519943295");
    }

/* -------------------------------------------------------------------- */
/*      Make sure we reproduce US Feet exactly too.                     */
/* -------------------------------------------------------------------- */
    poUnit = GetAttrNode( "PROJCS|UNIT" );
    
    if( poUnit != NULL && poUnit->GetChildCount() >= 2 
        && ABS(GetLinearUnits()- 0.30480060960121924) < 0.000000000000001)
    {
        poUnit->GetChild(0)->SetValue("Foot_US");
        poUnit->GetChild(1)->SetValue("0.30480060960121924");
    }

/* -------------------------------------------------------------------- */
/*      Remap parameters used for Albers and Mercator.                  */
/* -------------------------------------------------------------------- */
    pszProjection = GetAttrValue("PROJECTION");
    
    if( pszProjection != NULL && EQUAL(pszProjection,"Albers") )
        GetRoot()->applyRemapper( 
            "PARAMETER", apszAlbersMapping + 1, apszAlbersMapping + 0, 2 );

    if( pszProjection != NULL 
        && EQUAL(pszProjection,SRS_PT_EQUIDISTANT_CONIC) )
        GetRoot()->applyRemapper( 
            "PARAMETER", apszECMapping + 1, apszECMapping + 0, 2 );

    if( pszProjection != NULL && EQUAL(pszProjection,"Mercator") )
        GetRoot()->applyRemapper( 
            "PARAMETER", apszMercatorMapping + 1, apszMercatorMapping + 0, 2 );

    if( pszProjection != NULL 
        && EQUALN(pszProjection,"Stereographic_",14)
        && EQUALN(pszProjection+strlen(pszProjection)-5,"_Pole",5) )
        GetRoot()->applyRemapper( 
            "PARAMETER", 
            apszPolarStereographicMapping + 1, 
            apszPolarStereographicMapping + 0, 2 );

/* -------------------------------------------------------------------- */
/*      Convert SPHEROID name to use underscores instead of spaces.     */
/* -------------------------------------------------------------------- */
    OGR_SRSNode *poSpheroid;

    poSpheroid = GetAttrNode( "SPHEROID" );
    if( poSpheroid != NULL )
        poSpheroid = poSpheroid->GetChild(0);

    if( poSpheroid != NULL )
    {
        char *pszNewValue = CPLStrdup(RemapSpheroidName(poSpheroid->GetValue()));

        MorphNameToESRI( &pszNewValue );

        poSpheroid->SetValue( pszNewValue );
        CPLFree( pszNewValue );
    }
    
/* -------------------------------------------------------------------- */
/*      Try to insert a D_ in front of the datum name.                  */
/* -------------------------------------------------------------------- */
    OGR_SRSNode *poDatum;

    poDatum = GetAttrNode( "DATUM" );
    if( poDatum != NULL )
        poDatum = poDatum->GetChild(0);

    if( poDatum != NULL )
    {
        if( !EQUALN(poDatum->GetValue(),"D_",2) )
        {
            char *pszNewValue;

            pszNewValue = (char *) CPLMalloc(strlen(poDatum->GetValue())+3);
            strcpy( pszNewValue, "D_" );
            strcat( pszNewValue, poDatum->GetValue() );
            poDatum->SetValue( pszNewValue );
            CPLFree( pszNewValue );
        }
    }

    return OGRERR_NONE;
}

/************************************************************************/
/*                           OSRMorphToESRI()                           */
/************************************************************************/

OGRErr OSRMorphToESRI( OGRSpatialReferenceH hSRS )

{
    return ((OGRSpatialReference *) hSRS)->morphToESRI();
}

/************************************************************************/
/*                           morphFromESRI()                            */
/*                                                                      */
/*      modify this definition from the ESRI definition of WKT to       */
/*      the "Standard" definition.                                      */
/************************************************************************/

/**
 * Convert in place to ESRI WKT format.
 *
 * The value nodes of this coordinate system as modified in various manners
 * more closely map onto the ESRI concept of WKT format.  This includes
 * renaming a variety of projections and arguments, and stripping out 
 * nodes note recognised by ESRI (like AUTHORITY and AXIS). 
 *
 * This does the same as the C function OSRMorphFromESRI().
 *
 * @return OGRERR_NONE unless something goes badly wrong.
 */

OGRErr OGRSpatialReference::morphFromESRI()

{
    OGRErr      eErr = OGRERR_NONE;

    if( GetRoot() == NULL )
        return OGRERR_NONE;

/* -------------------------------------------------------------------- */
/*      Translate DATUM keywords that are oddly named.                  */
/* -------------------------------------------------------------------- */
    InitDatumMappingTable();

    GetRoot()->applyRemapper( "DATUM", 
                              papszDatumMapping+1, papszDatumMapping+2, 3 );

/* -------------------------------------------------------------------- */
/*      Try to remove any D_ in front of the datum name.                */
/* -------------------------------------------------------------------- */
    OGR_SRSNode *poDatum;

    poDatum = GetAttrNode( "DATUM" );
    if( poDatum != NULL )
        poDatum = poDatum->GetChild(0);

    if( poDatum != NULL )
    {
        if( EQUALN(poDatum->GetValue(),"D_",2) )
        {
            char *pszNewValue = CPLStrdup( poDatum->GetValue() + 2 );
            poDatum->SetValue( pszNewValue );
            CPLFree( pszNewValue );
        }
    }

/* -------------------------------------------------------------------- */
/*      Split Lambert_Conformal_Conic into 1SP or 2SP form.             */
/*                                                                      */
/*      See bugzilla.remotesensing.org/show_bug.cgi?id=187              */
/* -------------------------------------------------------------------- */
    const char *pszProjection = GetAttrValue("PROJECTION");
    
    if( pszProjection != NULL
        && EQUAL(pszProjection,"Lambert_Conformal_Conic") )
    {
        if( GetProjParm( "Scale_Factor", 2.0 ) == 2.0 )
            SetNode( "PROJCS|PROJECTION", 
                     SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP );
        else
            SetNode( "PROJCS|PROJECTION", 
                     SRS_PT_LAMBERT_CONFORMAL_CONIC_1SP );
    }

/* -------------------------------------------------------------------- */
/*      If we are remapping Hotine_Oblique_Mercator_Azimuth_Center      */
/*      add a rectified_grid_angle parameter - to match the azimuth     */
/*      I guess.                                                        */
/* -------------------------------------------------------------------- */
    if( pszProjection != NULL
        && EQUAL(pszProjection,"Hotine_Oblique_Mercator_Azimuth_Center") )
    {
        SetProjParm( SRS_PP_RECTIFIED_GRID_ANGLE , 
                     GetProjParm( SRS_PP_AZIMUTH, 0.0 ) );
        FixupOrdering();
    }

/* -------------------------------------------------------------------- */
/*      Remap Albers, Mercator and Polar Stereographic parameters.      */
/* -------------------------------------------------------------------- */
    if( pszProjection != NULL && EQUAL(pszProjection,"Albers") )
        GetRoot()->applyRemapper( 
            "PARAMETER", apszAlbersMapping + 0, apszAlbersMapping + 1, 2 );

    if( pszProjection != NULL 
        && EQUAL(pszProjection,SRS_PT_EQUIDISTANT_CONIC) )
        GetRoot()->applyRemapper( 
            "PARAMETER", apszECMapping + 0, apszECMapping + 1, 2 );

    if( pszProjection != NULL && EQUAL(pszProjection,"Mercator") )
        GetRoot()->applyRemapper( 
            "PARAMETER", apszMercatorMapping + 0, apszMercatorMapping + 1, 2 );

    if( pszProjection != NULL 
        && EQUALN(pszProjection,"Stereographic_",14) 
        && EQUALN(pszProjection+strlen(pszProjection)-5,"_Pole",5) )
        GetRoot()->applyRemapper( 
            "PARAMETER", 
            apszPolarStereographicMapping + 0, 
            apszPolarStereographicMapping + 1, 2 );

/* -------------------------------------------------------------------- */
/*      Remap south and north polar stereographic to one value.         */
/* -------------------------------------------------------------------- */
    if( pszProjection != NULL
        && EQUALN(pszProjection,"Stereographic_",14)
        && EQUALN(pszProjection+strlen(pszProjection)-5,"_Pole",5) )
    {
        SetNode( "PROJCS|PROJECTION", SRS_PT_POLAR_STEREOGRAPHIC );
        pszProjection = GetAttrValue("PROJECTION");
    }

/* -------------------------------------------------------------------- */
/*      Translate PROJECTION keywords that are misnamed.                */
/* -------------------------------------------------------------------- */
    GetRoot()->applyRemapper( "PROJECTION", 
                              apszProjMapping, apszProjMapping+1, 2 );
    
/* -------------------------------------------------------------------- */
/*      Translate DATUM keywords that are misnamed.                     */
/* -------------------------------------------------------------------- */
    InitDatumMappingTable();

    GetRoot()->applyRemapper( "DATUM", 
                              papszDatumMapping+1, papszDatumMapping+2, 3 );

    return eErr;
}

/************************************************************************/
/*                          OSRMorphFromESRI()                          */
/************************************************************************/

OGRErr OSRMorphFromESRI( OGRSpatialReferenceH hSRS )

{
    return ((OGRSpatialReference *) hSRS)->morphFromESRI();
}