Hi,
See this and find test data and example commands
https://github.com/opengeospatial/OGC-API-Sprint-August-2020/issues/18.
If PixelIsPoint image has these GeoTIFF tags
Geotiff_Information:
Version: 1
Key_Revision: 1.0
Tagged_Information:
ModelTiepointTag (8,3):
0 0 0
-90 90 0
1024 0 0
0 90 0
0 1024 0
-90 0 0
1024 1024 0
0 0 0
End_Of_Tags.
Keyed_Information:
GTModelTypeGeoKey (Short,1): ModelTypeGeographic
GTRasterTypeGeoKey (Short,1): RasterPixelIsPoint
and PixelIsArea has the same tags except GTRasterTypeGeoKey (Short,1):
RasterPixelIsArea
Now shouldn't the PixelIsPoint image slide half a pixel to the left and upwards
compared to PixelIsArea image? If I run these images through gdalwarp the
warped pixel_is_area image shows corner coordinates Upper Left (-180.0000000,
90.0000000) and pixel_is_point image Upper Left (-179.9560547, 89.9560547),
so sliding happens to the right and downwards.
It is late and I feel fuzzy but shouldn't the pixel_is_point variant has
smaller easting, greater northing instead, thus (-180,0439453, 90,04394531)?
The images are georeferenced with tiepoints/GCPs, perhaps it adds something to
the soup?
-Jukka Rahkonen-
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