Rahkonen Jukka wrote:
Hi,
I must use two different projections (epsg:2393 and 3067) which both
have a common centre meridian 27°E. One is transverse Mercator with
scale factor 1, another UTM with scale factor 0.996. Now I can use the
same images, without any physical or on-the-fly reprojection simply by
creating two sets of world files with adjusted origos and pixel
sizes. Actually in my case this leads also to better accuracy because
another system has some local distortions which I can compensate by
sliding the origo to correct place with world file.
But I have a problem: vast majority of my images are in GeoTIFF format
having internally defined coordinate system epsg:3067. I wonder if
there is some trick to override this projection by world files.
Something like a hidden switch TRUST_WORLDFILE=YES which I could use in
the mapfile. Does such a switch exist?
Jukka,
I'm afraid there is no such option.
Alternate approaches include:
1) reprocess the tiff so it has no internal geo information. For example,
with gdal_translate -co PROFILE=BASELINE
2) Create a VRT wrapper for the TIFF in which you can modify the geotransform
and then use that VRT proxy in place of the TIFF.
3) well, I'm sure there are other methods.
Best regards,
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