I'm trying to understand GeoTIFF info, but not getting far. For instance, using listgeo with one file I can get this output:
Geotiff_Information: Version: 1 Key_Revision: 1.0 Tagged_Information: ModelTiepointTag (2,3): 0 0 0 617632.387 5169109.1 0 ModelPixelScaleTag (1,3): 0.597164283 0.597164283 1 End_Of_Tags. Keyed_Information: GTModelTypeGeoKey (Short,1): ModelTypeProjected GTRasterTypeGeoKey (Short,1): RasterPixelIsArea GeographicTypeGeoKey (Short,1): Unknown-4167 GeogAngularUnitsGeoKey (Short,1): Angular_Degree GeogSemiMajorAxisGeoKey (Double,1): 6378137 GeogSemiMinorAxisGeoKey (Double,1): 6356752.31 GeogInvFlatteningGeoKey (Double,1): 298.257222 ProjectedCSTypeGeoKey (Short,1): Unknown-2134 ProjLinearUnitsGeoKey (Short,1): Linear_Meter End_Of_Keys. End_Of_Geotiff. PCS = 2134 (name unknown) GCS: 4167/(unknown) Projection Linear Units: 9001/metre (1.000000m) Corner Coordinates: Upper Left ( 617632.387, 5169109.098) Lower Left ( 617632.387, 5164958.209) Upper Right ( 621797.608, 5169109.098) Lower Right ( 621797.608, 5164958.209) Center ( 619714.997, 5167033.654) Now, I know that those corner coords are UTM, but does anything in the other tags tell me that?
Similarly, with a different projection, the same area gives me:
Geotiff_Information: Version: 1 Key_Revision: 1.0 Tagged_Information: ModelTiepointTag (2,3): 0 0 0 19198032.5 -5377596.2 0 ModelPixelScaleTag (1,3): 0.597164283 0.597164283 1 End_Of_Tags. Keyed_Information: GTModelTypeGeoKey (Short,1): ModelTypeProjected GTRasterTypeGeoKey (Short,1): RasterPixelIsArea GeographicTypeGeoKey (Short,1): GCS_WGS_84 GeogAngularUnitsGeoKey (Short,1): Angular_Degree GeogSemiMajorAxisGeoKey (Double,1): 6378137 GeogSemiMinorAxisGeoKey (Double,1): 6356752.31 GeogInvFlatteningGeoKey (Double,1): 298.257224 ProjectedCSTypeGeoKey (Short,1): Unknown-3395 ProjCoordTransGeoKey (Short,1): CT_Mercator ProjLinearUnitsGeoKey (Short,1): Linear_Meter ProjStdParallel1GeoKey (Double,1): 0 ProjStdParallel2GeoKey (Double,1): 0 ProjNatOriginLongGeoKey (Double,1): 0 ProjNatOriginLatGeoKey (Double,1): 0 ProjFalseEastingGeoKey (Double,1): 0 ProjFalseNorthingGeoKey (Double,1): 0 ProjFalseOriginLongGeoKey (Double,1): 0 ProjFalseOriginLatGeoKey (Double,1): 0 ProjFalseOriginEastingGeoKey (Double,1): 0 ProjFalseOriginNorthingGeoKey (Double,1): 0 ProjCenterLongGeoKey (Double,1): 0 ProjCenterLatGeoKey (Double,1): 0 ProjCenterEastingGeoKey (Double,1): 0 ProjCenterNorthingGeoKey (Double,1): 0 ProjScaleAtNatOriginGeoKey (Double,1): 1 ProjAzimuthAngleGeoKey (Double,1): 0 ProjStraightVertPoleLongGeoKey (Double,1): 0 End_Of_Keys. End_Of_Geotiff. PCS = 3395 (name unknown) Projection Method: CT_Mercator ProjNatOriginLatGeoKey: 0.000000 ( 0d 0' 0.00"N) ProjNatOriginLongGeoKey: 0.000000 ( 0d 0' 0.00"E) ProjScaleAtNatOriginGeoKey: 1.000000 ProjFalseEastingGeoKey: 0.000000 m ProjFalseNorthingGeoKey: 0.000000 m GCS: 4326/WGS 84 Datum: 6326/World Geodetic System 1984 Ellipsoid: 7030/WGS 84 (6378137.00,6356752.31) Prime Meridian: 8901/Greenwich (0.000000/ 0d 0' 0.00"E) Projection Linear Units: 9001/metre (1.000000m) Corner Coordinates: Upper Left (19198032.501,-5377596.196) Lower Left (19198032.501,-5383223.872) Upper Right (19203679.883,-5377596.196) Lower Right (19203679.883,-5383223.872) Center (19200856.192,-5380410.034) The tags 'tell me' this is WGS84 - but what are the coords? I'm trying to reliably extract positional data, but can't because I don't understand the what the output is telling me?
أكثر...
Geotiff_Information: Version: 1 Key_Revision: 1.0 Tagged_Information: ModelTiepointTag (2,3): 0 0 0 617632.387 5169109.1 0 ModelPixelScaleTag (1,3): 0.597164283 0.597164283 1 End_Of_Tags. Keyed_Information: GTModelTypeGeoKey (Short,1): ModelTypeProjected GTRasterTypeGeoKey (Short,1): RasterPixelIsArea GeographicTypeGeoKey (Short,1): Unknown-4167 GeogAngularUnitsGeoKey (Short,1): Angular_Degree GeogSemiMajorAxisGeoKey (Double,1): 6378137 GeogSemiMinorAxisGeoKey (Double,1): 6356752.31 GeogInvFlatteningGeoKey (Double,1): 298.257222 ProjectedCSTypeGeoKey (Short,1): Unknown-2134 ProjLinearUnitsGeoKey (Short,1): Linear_Meter End_Of_Keys. End_Of_Geotiff. PCS = 2134 (name unknown) GCS: 4167/(unknown) Projection Linear Units: 9001/metre (1.000000m) Corner Coordinates: Upper Left ( 617632.387, 5169109.098) Lower Left ( 617632.387, 5164958.209) Upper Right ( 621797.608, 5169109.098) Lower Right ( 621797.608, 5164958.209) Center ( 619714.997, 5167033.654) Now, I know that those corner coords are UTM, but does anything in the other tags tell me that?
Similarly, with a different projection, the same area gives me:
Geotiff_Information: Version: 1 Key_Revision: 1.0 Tagged_Information: ModelTiepointTag (2,3): 0 0 0 19198032.5 -5377596.2 0 ModelPixelScaleTag (1,3): 0.597164283 0.597164283 1 End_Of_Tags. Keyed_Information: GTModelTypeGeoKey (Short,1): ModelTypeProjected GTRasterTypeGeoKey (Short,1): RasterPixelIsArea GeographicTypeGeoKey (Short,1): GCS_WGS_84 GeogAngularUnitsGeoKey (Short,1): Angular_Degree GeogSemiMajorAxisGeoKey (Double,1): 6378137 GeogSemiMinorAxisGeoKey (Double,1): 6356752.31 GeogInvFlatteningGeoKey (Double,1): 298.257224 ProjectedCSTypeGeoKey (Short,1): Unknown-3395 ProjCoordTransGeoKey (Short,1): CT_Mercator ProjLinearUnitsGeoKey (Short,1): Linear_Meter ProjStdParallel1GeoKey (Double,1): 0 ProjStdParallel2GeoKey (Double,1): 0 ProjNatOriginLongGeoKey (Double,1): 0 ProjNatOriginLatGeoKey (Double,1): 0 ProjFalseEastingGeoKey (Double,1): 0 ProjFalseNorthingGeoKey (Double,1): 0 ProjFalseOriginLongGeoKey (Double,1): 0 ProjFalseOriginLatGeoKey (Double,1): 0 ProjFalseOriginEastingGeoKey (Double,1): 0 ProjFalseOriginNorthingGeoKey (Double,1): 0 ProjCenterLongGeoKey (Double,1): 0 ProjCenterLatGeoKey (Double,1): 0 ProjCenterEastingGeoKey (Double,1): 0 ProjCenterNorthingGeoKey (Double,1): 0 ProjScaleAtNatOriginGeoKey (Double,1): 1 ProjAzimuthAngleGeoKey (Double,1): 0 ProjStraightVertPoleLongGeoKey (Double,1): 0 End_Of_Keys. End_Of_Geotiff. PCS = 3395 (name unknown) Projection Method: CT_Mercator ProjNatOriginLatGeoKey: 0.000000 ( 0d 0' 0.00"N) ProjNatOriginLongGeoKey: 0.000000 ( 0d 0' 0.00"E) ProjScaleAtNatOriginGeoKey: 1.000000 ProjFalseEastingGeoKey: 0.000000 m ProjFalseNorthingGeoKey: 0.000000 m GCS: 4326/WGS 84 Datum: 6326/World Geodetic System 1984 Ellipsoid: 7030/WGS 84 (6378137.00,6356752.31) Prime Meridian: 8901/Greenwich (0.000000/ 0d 0' 0.00"E) Projection Linear Units: 9001/metre (1.000000m) Corner Coordinates: Upper Left (19198032.501,-5377596.196) Lower Left (19198032.501,-5383223.872) Upper Right (19203679.883,-5377596.196) Lower Right (19203679.883,-5383223.872) Center (19200856.192,-5380410.034) The tags 'tell me' this is WGS84 - but what are the coords? I'm trying to reliably extract positional data, but can't because I don't understand the what the output is telling me?
أكثر...