ok, thanks Mike.
A solution could be to transform the raster in a shape file, and to put
the different band values in different attributes of each element, and
then use the attributes values for selecting symbol and angle.
Thanks,
Helen
El 14/06/12 15:03, Smith, Michael ERDC-RDE-CRREL-NH escribió:
Helen,
It does not appear that you can. Based on the docs
Raster classifications always take place on only one raster band. It
defaults to the first band in the referenced file, but this can be altered
with the BANDS PROCESSING directive. In particular this means that
including even a single CLASS declaration in a raster layer will result in
the raster layer being rendered using the one band classification rules
instead of other rules that might have applied (such as 3 band RGB
rendering).
http://mapserver.org/input/raster.html
You could have multiple layers and do classification on each band by
changing the first value in the PROCESSING BANDS directive.
Mike
On 6/14/12 8:27 AM, "Helen San Segundo Navazo"<hsansegu...@meteo.cat>
wrote:
Hi,
I have a raster file with different bands inside it.
when I create my mapfile inside the layer tag I can define the bands I
want to access with PROCESSING "BANDS=4,2,1"
When I select 1 band I can access to its data using the EXPRESSION tag:
CLASS
NAME "0 - 5"
EXPRESSION ([pixel]>= 0 AND [pixel]< 5)
STYLE
COLOR 80 0 0
END
END
But if I select more than one band, how can I do to acces to the
different band values inside the same EXPRESSION tag? is it possible?
The problem is that I have wind information in different bands, in one
band I have speed and in other band I have direction, and I have to draw
the wind symbol depending on both values.
Is possible to acces to the different pixel band values inside the same
EXPRESSION tag?
Thanks,
Helen
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