Rahkonen Jukka wrote:
I made a test and I can affirm that "PROCESSING BANDS" in layer
definitions is just discarded in WCS.
Jukka,
More properly, we could say that it is overridden. :-)
Resampling types "NEAREST" and "BILINEAR" should be support
via WCS but have to be passed in via the WCS request. I
don't think you can establish defaults in the mapfile.
MapServer WCS DescribeCoverage is listing nearest neigbour and
bilinear as supported interpolation methods so this should really
be possible. From an OGC document
05-076_Web_Coverage_Service_WCS_Version_1.0.0_Corrigendum.pdf
I found that different interpolations should be asken in WCS
request with key INTERPOLATION = interpolation-method. I tried
to add &interpolation=bilinear to my request. Request was accected
and I received three-band image as I was ordering, but it appears
like greyscale image on screen and I believe that all three
channels are actually the same. I put my requests in the end of
this e-mail so somebody can check if there is something wrong
it.
Hmm, this sounds a bit like a problem that might have been fixed
already. What version of MapServer are you using? If it is
recent (ie. 4.10.3 or 5.0) I'd appreciate your filing a bug to
my attention with details to reproduce the problem, including a
data file, mapfile and request url.
I suspect the LUT operations are processed only in the image
modes other than "pure data". That is, IMAGEMODE BYTE likely
precludes their use as things stand. I could look at
altering this if you wanted.
I do not have any immediate use for that feature. But if somebody
is utilising LUT operations and keeps unadjusted images on server
and delivers them through LUT processing to WMS, then images
downloaded through WCS service would not look the same. But anyhow,
LUT processing works perhaps only for 1 of 3 band imagery and thus
it would not be useful for multichannel images in any case.
Part of the problem is that "pure data" modes like IMAGEMODE BYTE
deliberately try to avoid doing any of the usual MapServer processing
that would alter pixel values. Stuff like classification, stretching
and LUTs.
Best regards,
--
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