800         int nGCS = psDefn->GCS;  in GTIFGetOGISDefnAsOSR()  local
801         if( nGCS != KvUserDefined && nGCS > 0 )  in GTIFGetOGISDefnAsOSR()
803             oSRS.SetAuthority( "GEOGCS", "EPSG", nGCS );  in GTIFGetOGISDefnAsOSR()
806             if( verticalDatum == 6030 && nGCS == 4326 ) // DatumE_WGS84  in GTIFGetOGISDefnAsOSR()
817                 if( oTmpSRS.importFromEPSG(nGCS) == OGRERR_NONE &&  in GTIFGetOGISDefnAsOSR()
1642     int nGCS = KvUserDefined;  in GTIFSetFromOGISDefnEx()  local
1646         nGCS = atoi(poSRS->GetAuthorityCode("PROJCS|GEOGCS"));  in GTIFSetFromOGISDefnEx()
1649         nGCS = atoi(poSRS->GetAuthorityCode("GEOGCS"));  in GTIFSetFromOGISDefnEx()
1654     if( nGCS == 4937 && eVersion >= GEOTIFF_VERSION_1_1 )  in GTIFSetFromOGISDefnEx()
1660         nVerticalCSKeyValue = nGCS;  in GTIFSetFromOGISDefnEx()
1661         nGCS = 4258; // ETRS89 2D  in GTIFSetFromOGISDefnEx()
1663     else if( nGCS != KvUserDefined )  in GTIFSetFromOGISDefnEx()
1666         if( oGeogCRS.importFromEPSG(nGCS) == OGRERR_NONE &&  in GTIFSetFromOGISDefnEx()
1673                 const auto candidate_nVerticalCSKeyValue = nGCS;  in GTIFSetFromOGISDefnEx()
1674                 nGCS = KvUserDefined;  in GTIFSetFromOGISDefnEx()
1697                             nGCS = atoi(pszCode);  in GTIFSetFromOGISDefnEx()
1710         if( nGCS == 4979 || nDatum == 6326 || nSpheroid == 7030 )  in GTIFSetFromOGISDefnEx()
1713             if( nGCS == 4979 || nDatum == 6326 )  in GTIFSetFromOGISDefnEx()
1715                 nGCS = 4326;  in GTIFSetFromOGISDefnEx()
1728     if( nGCS > 32767 )  in GTIFSetFromOGISDefnEx()
1729         nGCS = KvUserDefined;  in GTIFSetFromOGISDefnEx()
2688     if( nGCS == KvUserDefined || eVersion == GEOTIFF_VERSION_1_0 )  in GTIFSetFromOGISDefnEx()
2728             (poSRS->IsGeocentric() && (nGCS == KvUserDefined || eVersion == GEOTIFF_VERSION_1_0))) )  in GTIFSetFromOGISDefnEx()
2739     if( nGCS == KvUserDefined || eVersion == GEOTIFF_VERSION_1_0 )  in GTIFSetFromOGISDefnEx()
2755         if( nGCS == KvUserDefined )  in GTIFSetFromOGISDefnEx()
2758                 nGCS = GCS_NAD27;  in GTIFSetFromOGISDefnEx()
2760                 nGCS = GCS_NAD83;  in GTIFSetFromOGISDefnEx()
2762                 nGCS = GCS_WGS_84;  in GTIFSetFromOGISDefnEx()
2765         if( nGCS != KvUserDefined )  in GTIFSetFromOGISDefnEx()
2768                         1, nGCS );  in GTIFSetFromOGISDefnEx()
2813         if( nGCS == KvUserDefined || eVersion == GEOTIFF_VERSION_1_0 )  in GTIFSetFromOGISDefnEx()
2825             if( nGCS == KvUserDefined  in GTIFSetFromOGISDefnEx()
2841     if( (nGCS == KvUserDefined || eVersion == GEOTIFF_VERSION_1_0 ) &&  in GTIFSetFromOGISDefnEx()
2874                 if( nGCS == GCS_WGS_84 && adfTOWGS84[0] == 0.0  in GTIFSetFromOGISDefnEx()