[mapserver-users] Shift of half a pixel

[Fritz van Deventer]

Hi all,

 

We are trying to get VHR satellite imagery to run as a WMS in different
GIS clients. When we compare the original image (we tried different
formats, tif, ecw, virtual formats etc.) to the hosted image we see a
shift in the pixels. Looks like a minor warp or transform. 

 

We are unable to find what is causing this error. We tried using
different output drivers, and different output and input formats. It
looks like serving with GDAL as output format and Imagemode on FLOAT32
gives the best result, however in black and white. 

 

If this is a known issue, is anyone able to tell me the (in)accuracy of
the shift? Or is it not supposed to happen altogether?

 

Regards,

 

Fritz van Deventer - http://neo.nl 

 

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