Hi,
As Even already answered, using vrt files over the BGRN originals will work. We
had a need to use both grayscale originals and vrt-falsified RGB versions (the
only band pointing to red, green, and blue in .vrt) in the same service. We
have only one tileindex in PostGIS, made from the tiff images, but it can be
modified on-the-fly in the tileindex layer
DATA "the_geom from (SELECT the_geom, fid, CASE WHEN filepath like '%_mv_%'
THEN replace(filepath,'TIFF','vrt') ELSE filepath END AS location,…
-Jukka Rahkonen-
Lähettäjä: mapserver-users <mapserver-users-boun...@lists.osgeo.org> Puolesta
Peter Schmitt
Lähetetty: maanantai 29. huhtikuuta 2019 19.41
Vastaanottaja: mapserver-users@lists.osgeo.org
Aihe: [mapserver-users] Conditional BANDS directive based on underlying data
Hi,
When my data is 4-band (BGRN), I use the BANDS processing directive to yield
RGB tiles, like so:
PROCESSING "BANDS=4,3,2"
Is there a way to have a single layer within a Mapfile that will set this
directive to 4,3,2 when the underlying data has four bands and either skip the
directive or set it to 1,2,3 when the underlying data is 3-band?
The only thing I can think of is it to try runtime substitution, where my
request might include the band order like
"REQUEST=WMS&the_band_order=4,3,2&...." and then configure my mapfile
accordingly:
PROCESSING "BANDS=%the_band_order%"
Is there another way which doesn't require the client to know about the
underlying data? FWIW, my ultimate use-case serves mosaics using a tile index
generated from Postgis. The Postgis table could have a column storing the band
information, but I'm not sure how to extract that in my LAYER/BANDS Processing
directive.
Thanks!
Pete
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