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Added support for WGS84 GeoTIFF images with the GCS defined using the ellipsoid only

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This commit is contained in:
Martin Tůma 2018-03-11 20:11:42 +01:00
parent 32d8672698
commit e0daf367fb
1 changed files with 10 additions and 2 deletions
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12
src/map/geotiff.cpp
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@ -23,6 +23,7 @@
#define GeogGeodeticDatumGeoKey 2050
#define GeogPrimeMeridianGeoKey 2051
#define GeogAngularUnitsGeoKey 2054
#define GeogEllipsoidGeoKey 2056
#define ProjectedCSTypeGeoKey 3072
#define ProjectionGeoKey 3074
#define ProjCoordTransGeoKey 3075
@ -241,6 +242,7 @@ bool GeoTIFF::readKeys(TIFFFile &file, Ctx &ctx, QMap<quint16, Value> &kv) const
case ProjectionGeoKey:
case ProjCoordTransGeoKey:
case ProjLinearUnitsGeoKey:
case GeogEllipsoidGeoKey:
if (entry.TIFFTagLocation != 0 || entry.Count != 1)
return false;
value.SHORT = entry.ValueOffset;
@ -295,13 +297,19 @@ const GCS *GeoTIFF::gcs(QMap<quint16, Value> &kv)
if (!(gcs = GCS::gcs(kv.value(GeographicTypeGeoKey).SHORT)))
_errorString = QString("%1: unknown GCS")
.arg(kv.value(GeographicTypeGeoKey).SHORT);
} else if (IS_SET(kv, GeogGeodeticDatumGeoKey)) {
} else if (IS_SET(kv, GeogGeodeticDatumGeoKey)
|| kv.value(GeogEllipsoidGeoKey).SHORT == 7019) {
int pm = IS_SET(kv, GeogPrimeMeridianGeoKey)
? kv.value(GeogPrimeMeridianGeoKey).SHORT : 8901;
int au = IS_SET(kv, GeogAngularUnitsGeoKey)
? kv.value(GeogAngularUnitsGeoKey).SHORT : 9102;
if (!(gcs = GCS::gcs(kv.value(GeogGeodeticDatumGeoKey).SHORT, pm, au)))
/* If only the ellipsoid is defined and it is GRS80, handle such
definition as a WGS84 geodetic datum. */
int gd = IS_SET(kv, GeogGeodeticDatumGeoKey)
? kv.value(GeogGeodeticDatumGeoKey).SHORT : 6326;
if (!(gcs = GCS::gcs(gd, pm, au)))
_errorString = QString("%1+%2: unknown geodetic datum + prime"
" meridian combination")
.arg(kv.value(GeogGeodeticDatumGeoKey).SHORT)