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Add datum mapping between EPSG/authority codes and the MapInfo definitio... #9

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Add datum mapping between EPSG/authority codes and the MapInfo definitio... #9

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1 change: 1 addition & 0 deletions mitab/mitab.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1894,6 +1894,7 @@ GBool MITABExtractCoordSysBounds( const char * pszCoordSys,
int MITABCoordSys2TABProjInfo(const char * pszCoordSys, TABProjInfo *psProj);

typedef struct {
int nDatumEPSGCode;
int nMapInfoDatumID;
const char *pszOGCDatumName;
int nEllipsoid;
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19 changes: 15 additions & 4 deletions mitab/mitab_coordsys.cpp
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Expand Up @@ -1145,6 +1145,15 @@ char *MITABSpatialRef2CoordSys( OGRSpatialReference * poSR )
double adfDatumParm[8] = {0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0};
int nEllipsoid=0;

int nDatumEPSGCode = -1;
const char *pszDatumAuthority = poSR->GetAuthorityName("DATUM");
const char *pszDatumCode = poSR->GetAuthorityCode("DATUM");

if (pszDatumCode && pszDatumAuthority && EQUAL(pszDatumAuthority, "EPSG"))
{
nDatumEPSGCode = atoi(pszDatumCode);
}

const char *pszWKTDatum = poSR->GetAttrValue("DATUM");

if( pszWKTDatum == NULL )
Expand Down Expand Up @@ -1202,16 +1211,18 @@ char *MITABSpatialRef2CoordSys( OGRSpatialReference * poSR )
}

/*-----------------------------------------------------------------
* We have a "real" datum name. Try to look it up and get the
* parameters. If we don't find it just use WGS84.
* We have a "real" datum name, and possibly an EPSG code for the
* datum. Try to look it up (using EPSG code first) and get the
* parameters. If we don't find it with either just use WGS84.
*----------------------------------------------------------------*/
else
{
int i;

for( i = 0; asDatumInfoList[i].nMapInfoDatumID != -1; i++ )
{
if( EQUAL(pszWKTDatum,asDatumInfoList[i].pszOGCDatumName) )
if ( (nDatumEPSGCode > 0 && asDatumInfoList[i].nDatumEPSGCode == nDatumEPSGCode) ||
EQUAL(pszWKTDatum,asDatumInfoList[i].pszOGCDatumName) )
{
nDatum = asDatumInfoList[i].nMapInfoDatumID;
break;
Expand All @@ -1221,7 +1232,7 @@ char *MITABSpatialRef2CoordSys( OGRSpatialReference * poSR )
if( nDatum == 0 )
nDatum = 104; /* WGS84 */
}

/*-----------------------------------------------------------------
* Translate the units
*----------------------------------------------------------------*/
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