Exemplo n.º 1
0
int OGRProj4CT::InitializeNoLock( OGRSpatialReference * poSourceIn, 
                                  OGRSpatialReference * poTargetIn )

{
    if( poSourceIn == NULL || poTargetIn == NULL )
        return FALSE;

    poSRSSource = poSourceIn->Clone();
    poSRSTarget = poTargetIn->Clone();

    bSourceLatLong = poSRSSource->IsGeographic();
    bTargetLatLong = poSRSTarget->IsGeographic();

/* -------------------------------------------------------------------- */
/*      Setup source and target translations to radians for lat/long    */
/*      systems.                                                        */
/* -------------------------------------------------------------------- */
    dfSourceToRadians = DEG_TO_RAD;
    bSourceWrap = FALSE;
    dfSourceWrapLong = 0.0;

    if( bSourceLatLong )
    {
        OGR_SRSNode *poUNITS = poSRSSource->GetAttrNode( "GEOGCS|UNIT" );
        if( poUNITS && poUNITS->GetChildCount() >= 2 )
        {
            dfSourceToRadians = atof(poUNITS->GetChild(1)->GetValue());
            if( dfSourceToRadians == 0.0 )
                dfSourceToRadians = DEG_TO_RAD;
        }
    }

    dfTargetFromRadians = RAD_TO_DEG;
    bTargetWrap = FALSE;
    dfTargetWrapLong = 0.0;

    if( bTargetLatLong )
    {
        OGR_SRSNode *poUNITS = poSRSTarget->GetAttrNode( "GEOGCS|UNIT" );
        if( poUNITS && poUNITS->GetChildCount() >= 2 )
        {
            double dfTargetToRadians = atof(poUNITS->GetChild(1)->GetValue());
            if( dfTargetToRadians != 0.0 )
                dfTargetFromRadians = 1 / dfTargetToRadians;
        }
    }

/* -------------------------------------------------------------------- */
/*      Preliminary logic to setup wrapping.                            */
/* -------------------------------------------------------------------- */
    const char *pszCENTER_LONG;

    if( CPLGetConfigOption( "CENTER_LONG", NULL ) != NULL )
    {
        bSourceWrap = bTargetWrap = TRUE;
        dfSourceWrapLong = dfTargetWrapLong = 
            atof(CPLGetConfigOption( "CENTER_LONG", "" ));
        CPLDebug( "OGRCT", "Wrap at %g.", dfSourceWrapLong );
    }

    pszCENTER_LONG = poSRSSource->GetExtension( "GEOGCS", "CENTER_LONG" );
    if( pszCENTER_LONG != NULL )
    {
        dfSourceWrapLong = atof(pszCENTER_LONG);
        bSourceWrap = TRUE;
        CPLDebug( "OGRCT", "Wrap source at %g.", dfSourceWrapLong );
    }

    pszCENTER_LONG = poSRSTarget->GetExtension( "GEOGCS", "CENTER_LONG" );
    if( pszCENTER_LONG != NULL )
    {
        dfTargetWrapLong = atof(pszCENTER_LONG);
        bTargetWrap = TRUE;
        CPLDebug( "OGRCT", "Wrap target at %g.", dfTargetWrapLong );
    }
    
    bCheckWithInvertProj = CSLTestBoolean(CPLGetConfigOption( "CHECK_WITH_INVERT_PROJ", "NO" ));
    
    /* The threshold is rather experimental... Works well with the cases of ticket #2305 */
    if (bSourceLatLong)
        dfThreshold = atof(CPLGetConfigOption( "THRESHOLD", ".1" ));
    else
        /* 1 works well for most projections, except for +proj=aeqd that requires */
        /* a tolerance of 10000 */
        dfThreshold = atof(CPLGetConfigOption( "THRESHOLD", "10000" ));

/* -------------------------------------------------------------------- */
/*      Establish PROJ.4 handle for source if projection.               */
/* -------------------------------------------------------------------- */
    // OGRThreadSafety: The following variable is not a thread safety issue 
    // since the only issue is incrementing while accessing which at worse 
    // means debug output could be one "increment" late. 
    static int   nDebugReportCount = 0;

    char        *pszSrcProj4Defn = NULL;

    if( poSRSSource->exportToProj4( &pszSrcProj4Defn ) != OGRERR_NONE )
    {
        CPLFree( pszSrcProj4Defn );
        return FALSE;
    }

    if( strlen(pszSrcProj4Defn) == 0 )
    {
        CPLFree( pszSrcProj4Defn );
        CPLError( CE_Failure, CPLE_AppDefined, 
                  "No PROJ.4 translation for source SRS, coordinate\n"
                  "transformation initialization has failed." );
        return FALSE;
    }

    if (pjctx)
        psPJSource = pfn_pj_init_plus_ctx( pjctx, pszSrcProj4Defn );
    else
        psPJSource = pfn_pj_init_plus( pszSrcProj4Defn );
    
    if( psPJSource == NULL )
    {
        if( pjctx != NULL)
        {
            int pj_errno = pfn_pj_ctx_get_errno(pjctx);

            /* pfn_pj_strerrno not yet thread-safe in PROJ 4.8.0 */
            CPLMutexHolderD(&hPROJMutex);
            CPLError( CE_Failure, CPLE_NotSupported, 
                      "Failed to initialize PROJ.4 with `%s'.\n%s", 
                      pszSrcProj4Defn, pfn_pj_strerrno(pj_errno) );
        }
        else if( pfn_pj_get_errno_ref != NULL
            && pfn_pj_strerrno != NULL )
        {
            int *p_pj_errno = pfn_pj_get_errno_ref();

            CPLError( CE_Failure, CPLE_NotSupported, 
                      "Failed to initialize PROJ.4 with `%s'.\n%s", 
                      pszSrcProj4Defn, pfn_pj_strerrno(*p_pj_errno) );
        }
        else
        {
            CPLError( CE_Failure, CPLE_NotSupported, 
                      "Failed to initialize PROJ.4 with `%s'.\n", 
                      pszSrcProj4Defn );
        }
    }
    
    if( nDebugReportCount < 10 )
        CPLDebug( "OGRCT", "Source: %s", pszSrcProj4Defn );

    if( psPJSource == NULL )
    {
        CPLFree( pszSrcProj4Defn );
        return FALSE;
    }

/* -------------------------------------------------------------------- */
/*      Establish PROJ.4 handle for target if projection.               */
/* -------------------------------------------------------------------- */

    char        *pszDstProj4Defn = NULL;

    if( poSRSTarget->exportToProj4( &pszDstProj4Defn ) != OGRERR_NONE )
    {
        CPLFree( pszSrcProj4Defn );
        CPLFree( pszDstProj4Defn );
        return FALSE;
    }

    if( strlen(pszDstProj4Defn) == 0 )
    {
        CPLFree( pszSrcProj4Defn );
        CPLFree( pszDstProj4Defn );
        CPLError( CE_Failure, CPLE_AppDefined, 
                  "No PROJ.4 translation for destination SRS, coordinate\n"
                  "transformation initialization has failed." );
        return FALSE;
    }

    if (pjctx)
        psPJTarget = pfn_pj_init_plus_ctx( pjctx, pszDstProj4Defn );
    else
        psPJTarget = pfn_pj_init_plus( pszDstProj4Defn );
    
    if( psPJTarget == NULL )
        CPLError( CE_Failure, CPLE_NotSupported, 
                  "Failed to initialize PROJ.4 with `%s'.", 
                  pszDstProj4Defn );
    
    if( nDebugReportCount < 10 )
    {
        CPLDebug( "OGRCT", "Target: %s", pszDstProj4Defn );
        nDebugReportCount++;
    }

    if( psPJTarget == NULL )
    {
        CPLFree( pszSrcProj4Defn );
        CPLFree( pszDstProj4Defn );
        return FALSE;
    }

    /* Determine if we really have a transformation to do */
    bIdentityTransform = (strcmp(pszSrcProj4Defn, pszDstProj4Defn) == 0);

    /* In case of identity transform, under the following conditions, */
    /* we can also avoid transforming from deegrees <--> radians. */
    if( bIdentityTransform && bSourceLatLong && !bSourceWrap &&
        bTargetLatLong && !bTargetWrap &&
        abs(dfSourceToRadians * dfTargetFromRadians - 1.0) < 1e-10 )
    {
        /*bSourceLatLong = FALSE;
        bTargetLatLong = FALSE;*/
    }

    CPLFree( pszSrcProj4Defn );
    CPLFree( pszDstProj4Defn );

    return TRUE;
}
Exemplo n.º 2
0
int OGRProj4CT::InitializeNoLock( OGRSpatialReference * poSourceIn,
                                  OGRSpatialReference * poTargetIn )

{
    if( poSourceIn == NULL || poTargetIn == NULL )
        return FALSE;

    poSRSSource = poSourceIn->Clone();
    poSRSTarget = poTargetIn->Clone();

    bSourceLatLong = CPL_TO_BOOL(poSRSSource->IsGeographic());
    bTargetLatLong = CPL_TO_BOOL(poSRSTarget->IsGeographic());

/* -------------------------------------------------------------------- */
/*      Setup source and target translations to radians for lat/long    */
/*      systems.                                                        */
/* -------------------------------------------------------------------- */
    dfSourceToRadians = DEG_TO_RAD;
    bSourceWrap = false;
    dfSourceWrapLong = 0.0;

    if( bSourceLatLong )
    {
        OGR_SRSNode *poUNITS = poSRSSource->GetAttrNode( "GEOGCS|UNIT" );
        if( poUNITS && poUNITS->GetChildCount() >= 2 )
        {
            dfSourceToRadians = CPLAtof(poUNITS->GetChild(1)->GetValue());
            if( dfSourceToRadians == 0.0 )
                dfSourceToRadians = DEG_TO_RAD;
        }
    }

    dfTargetFromRadians = RAD_TO_DEG;
    bTargetWrap = false;
    dfTargetWrapLong = 0.0;

    if( bTargetLatLong )
    {
        OGR_SRSNode *poUNITS = poSRSTarget->GetAttrNode( "GEOGCS|UNIT" );
        if( poUNITS && poUNITS->GetChildCount() >= 2 )
        {
            double dfTargetToRadians = CPLAtof(poUNITS->GetChild(1)->GetValue());
            if( dfTargetToRadians != 0.0 )
                dfTargetFromRadians = 1 / dfTargetToRadians;
        }
    }

/* -------------------------------------------------------------------- */
/*      Preliminary logic to setup wrapping.                            */
/* -------------------------------------------------------------------- */
    if( CPLGetConfigOption( "CENTER_LONG", NULL ) != NULL )
    {
        bSourceWrap = true;
        bTargetWrap = true;
        dfSourceWrapLong = dfTargetWrapLong =
            CPLAtof(CPLGetConfigOption( "CENTER_LONG", "" ));
        CPLDebug( "OGRCT", "Wrap at %g.", dfSourceWrapLong );
    }

    const char *pszCENTER_LONG =
        poSRSSource->GetExtension( "GEOGCS", "CENTER_LONG" );
    if( pszCENTER_LONG != NULL )
    {
        dfSourceWrapLong = CPLAtof(pszCENTER_LONG);
        bSourceWrap = true;
        CPLDebug( "OGRCT", "Wrap source at %g.", dfSourceWrapLong );
    }

    pszCENTER_LONG = poSRSTarget->GetExtension( "GEOGCS", "CENTER_LONG" );
    if( pszCENTER_LONG != NULL )
    {
        dfTargetWrapLong = CPLAtof(pszCENTER_LONG);
        bTargetWrap = true;
        CPLDebug( "OGRCT", "Wrap target at %g.", dfTargetWrapLong );
    }

    bCheckWithInvertProj =
        CPLTestBool(CPLGetConfigOption( "CHECK_WITH_INVERT_PROJ", "NO" ));

    // The threshold is experimental. Works well with the cases of ticket #2305.
    if( bSourceLatLong )
        dfThreshold = CPLAtof(CPLGetConfigOption( "THRESHOLD", ".1" ));
    else
        // 1 works well for most projections, except for +proj=aeqd that
        // requires a tolerance of 10000.
        dfThreshold = CPLAtof(CPLGetConfigOption( "THRESHOLD", "10000" ));

    // OGRThreadSafety: The following variable is not a thread safety issue
    // since the only issue is incrementing while accessing which at worse
    // means debug output could be one "increment" late.
    static int   nDebugReportCount = 0;

    char        *pszSrcProj4Defn = NULL;

    if( poSRSSource->exportToProj4( &pszSrcProj4Defn ) != OGRERR_NONE )
    {
        CPLFree( pszSrcProj4Defn );
        return FALSE;
    }

    if( strlen(pszSrcProj4Defn) == 0 )
    {
        CPLFree( pszSrcProj4Defn );
        CPLError( CE_Failure, CPLE_AppDefined,
                  "No PROJ.4 translation for source SRS, coordinate\n"
                  "transformation initialization has failed." );
        return FALSE;
    }

    char        *pszDstProj4Defn = NULL;

    if( poSRSTarget->exportToProj4( &pszDstProj4Defn ) != OGRERR_NONE )
    {
        CPLFree( pszSrcProj4Defn );
        CPLFree( pszDstProj4Defn );
        return FALSE;
    }

    if( strlen(pszDstProj4Defn) == 0 )
    {
        CPLFree( pszSrcProj4Defn );
        CPLFree( pszDstProj4Defn );
        CPLError( CE_Failure, CPLE_AppDefined,
                  "No PROJ.4 translation for destination SRS, coordinate\n"
                  "transformation initialization has failed." );
        return FALSE;
    }

/* -------------------------------------------------------------------- */
/*      Optimization to avoid useless nadgrids evaluation.              */
/*      For example when converting between WGS84 and WebMercator       */
/* -------------------------------------------------------------------- */
    if( pszSrcProj4Defn[strlen(pszSrcProj4Defn)-1] == ' ' )
        pszSrcProj4Defn[strlen(pszSrcProj4Defn)-1] = 0;
    if( pszDstProj4Defn[strlen(pszDstProj4Defn)-1] == ' ' )
        pszDstProj4Defn[strlen(pszDstProj4Defn)-1] = 0;
    char* pszNeedle = strstr(pszSrcProj4Defn, "  ");
    if( pszNeedle )
        memmove(pszNeedle, pszNeedle + 1, strlen(pszNeedle + 1)+1);
    pszNeedle = strstr(pszDstProj4Defn, "  ");
    if( pszNeedle )
        memmove(pszNeedle, pszNeedle + 1, strlen(pszNeedle + 1)+1);

    if( (strstr(pszSrcProj4Defn, "+datum=WGS84") != NULL ||
         strstr(pszSrcProj4Defn, "+ellps=WGS84 +towgs84=0,0,0,0,0,0,0 ") != NULL) &&
        strstr(pszDstProj4Defn, "+nadgrids=@null ") != NULL &&
        strstr(pszDstProj4Defn, "+towgs84") == NULL )
    {
        char* pszDst = strstr(pszSrcProj4Defn, "+towgs84=0,0,0,0,0,0,0 ");
        if( pszDst != NULL )
        {
            char *pszSrc = pszDst + strlen("+towgs84=0,0,0,0,0,0,0 ");
            memmove(pszDst, pszSrc, strlen(pszSrc)+1);
        }
        else
        {
            memcpy(strstr(pszSrcProj4Defn, "+datum=WGS84"), "+ellps", 6);
        }

        pszDst = strstr(pszDstProj4Defn, "+nadgrids=@null ");
        char *pszSrc = pszDst + strlen("+nadgrids=@null ");
        memmove(pszDst, pszSrc, strlen(pszSrc)+1);

        pszDst = strstr(pszDstProj4Defn, "+wktext ");
        if( pszDst )
        {
            pszSrc = pszDst + strlen("+wktext ");
            memmove(pszDst, pszSrc, strlen(pszSrc)+1);
        }

        //bWGS84ToWebMercator =
        //    strcmp(pszSrcProj4Defn, "+proj=longlat +ellps=WGS84 +no_defs") == 0 &&
        //    strcmp(pszDstProj4Defn, "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +no_defs") == 0;
    }
    else
    if( (strstr(pszDstProj4Defn, "+datum=WGS84") != NULL ||
         strstr(pszDstProj4Defn, "+ellps=WGS84 +towgs84=0,0,0,0,0,0,0 ") != NULL) &&
        strstr(pszSrcProj4Defn, "+nadgrids=@null ") != NULL &&
        strstr(pszSrcProj4Defn, "+towgs84") == NULL )
    {
        char* pszDst = strstr(pszDstProj4Defn, "+towgs84=0,0,0,0,0,0,0 ");
        if( pszDst != NULL)
        {
            char* pszSrc = pszDst + strlen("+towgs84=0,0,0,0,0,0,0 ");
            memmove(pszDst, pszSrc, strlen(pszSrc)+1);
        }
        else
            memcpy(strstr(pszDstProj4Defn, "+datum=WGS84"), "+ellps", 6);

        pszDst = strstr(pszSrcProj4Defn, "+nadgrids=@null ");
        char* pszSrc = pszDst + strlen("+nadgrids=@null ");
        memmove(pszDst, pszSrc, strlen(pszSrc)+1);

        pszDst = strstr(pszSrcProj4Defn, "+wktext ");
        if( pszDst )
        {
            pszSrc = pszDst + strlen("+wktext ");
            memmove(pszDst, pszSrc, strlen(pszSrc)+1);
        }
        bWebMercatorToWGS84 =
            strcmp(pszDstProj4Defn,
                   "+proj=longlat +ellps=WGS84 +no_defs") == 0 &&
            strcmp(pszSrcProj4Defn,
                   "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 "
                   "+x_0=0.0 +y_0=0 +k=1.0 +units=m +no_defs") == 0;
    }

/* -------------------------------------------------------------------- */
/*      Establish PROJ.4 handle for source if projection.               */
/* -------------------------------------------------------------------- */
    if( !bWebMercatorToWGS84 )
    {
        if (pjctx)
            psPJSource = pfn_pj_init_plus_ctx( pjctx, pszSrcProj4Defn );
        else
            psPJSource = pfn_pj_init_plus( pszSrcProj4Defn );

        if( psPJSource == NULL )
        {
            if( pjctx != NULL)
            {
                int l_pj_errno = pfn_pj_ctx_get_errno(pjctx);

                /* pfn_pj_strerrno not yet thread-safe in PROJ 4.8.0 */
                CPLMutexHolderD(&hPROJMutex);
                CPLError( CE_Failure, CPLE_NotSupported,
                        "Failed to initialize PROJ.4 with `%s'.\n%s",
                        pszSrcProj4Defn, pfn_pj_strerrno(l_pj_errno) );
            }
            else if( pfn_pj_get_errno_ref != NULL
                && pfn_pj_strerrno != NULL )
            {
                int *p_pj_errno = pfn_pj_get_errno_ref();

                CPLError( CE_Failure, CPLE_NotSupported,
                        "Failed to initialize PROJ.4 with `%s'.\n%s",
                        pszSrcProj4Defn, pfn_pj_strerrno(*p_pj_errno) );
            }
            else
            {
                CPLError( CE_Failure, CPLE_NotSupported,
                        "Failed to initialize PROJ.4 with `%s'.\n",
                        pszSrcProj4Defn );
            }
        }
    }

    if( nDebugReportCount < 10 )
        CPLDebug( "OGRCT", "Source: %s", pszSrcProj4Defn );

    if( !bWebMercatorToWGS84 && psPJSource == NULL )
    {
        CPLFree( pszSrcProj4Defn );
        CPLFree( pszDstProj4Defn );
        return FALSE;
    }

/* -------------------------------------------------------------------- */
/*      Establish PROJ.4 handle for target if projection.               */
/* -------------------------------------------------------------------- */
    if( !bWebMercatorToWGS84 )
    {
        if (pjctx)
            psPJTarget = pfn_pj_init_plus_ctx( pjctx, pszDstProj4Defn );
        else
            psPJTarget = pfn_pj_init_plus( pszDstProj4Defn );

        if( psPJTarget == NULL )
            CPLError( CE_Failure, CPLE_NotSupported,
                    "Failed to initialize PROJ.4 with `%s'.",
                    pszDstProj4Defn );
    }
    if( nDebugReportCount < 10 )
    {
        CPLDebug( "OGRCT", "Target: %s", pszDstProj4Defn );
        nDebugReportCount++;
    }

    if( !bWebMercatorToWGS84 && psPJTarget == NULL )
    {
        CPLFree( pszSrcProj4Defn );
        CPLFree( pszDstProj4Defn );
        return FALSE;
    }

    /* Determine if we really have a transformation to do */
    bIdentityTransform = strcmp(pszSrcProj4Defn, pszDstProj4Defn) == 0;

#if 0
    /* In case of identity transform, under the following conditions, */
    /* we can also avoid transforming from degrees <--> radians. */
    if( bIdentityTransform && bSourceLatLong && !bSourceWrap &&
        bTargetLatLong && !bTargetWrap &&
        fabs(dfSourceToRadians * dfTargetFromRadians - 1.0) < 1e-10 )
    {
        // bSourceLatLong = false;
        // bTargetLatLong = false;
    }
#endif

    CPLFree( pszSrcProj4Defn );
    CPLFree( pszDstProj4Defn );

    return TRUE;
}