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;
}
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;
}