Hans,
I had assumed that you were trying to modify layer transparency. In other
words, you have one layer that is 50% transparent that allows a 'lower' layer
to show through the 'upper' layer. Like semi-transparent building footprints
on an air photo. This is what you accomplished with the below map file.
It sounds like what you really want is for MapServer to produce an image where
the 'no data' areas are transparent.
TRANSPARENT in the MAP object is what makes it work.
http://mapserver.gis.umn.edu/docs/reference/mapfile/mapObj
I am not sure if this part of the docs is up to date or not. Output format is
also important. You can't accomplish image transparency with a gif. PNG24
will do it for you. I believe that you need to use a 24 bit image type, but I
am not completely sure if that is a requirement.
David.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hans
Castorp
Sent: Thursday, February 21, 2008 11:51 AM
To: [email protected]
Subject: [mapserver-users] "classed" layer transparency
Hi to all,
I'm having problems trying to give transparency to a polygon layer;
here are my settings:
LAYER
NAME 'usos_suelo'
GROUP 'usos_suelo'
DATA "usos_suelo"
TYPE polygon
STATUS ON
OPACITY 50
CLASSITEM 'CLASE'
CLASS
NAME 'ARBORES'
EXPRESSION 'ARBORES'
COLOR 162 204 155
END
CLASS
NAME 'CULTIVOS'
EXPRESSION 'CULTIVOS'
COLOR 224 224 224
END
CLASS
NAME 'ASENTAMENTOS'
EXPRESSION 'ASENTAMENTOS'
COLOR 204 204 204
END
END
I guess that the problem could come due to the fact that is a "classed"
layer, but I need it to have some level of transparency.
Anyone who helps me?
Thanks in advance.
Hans Castorp
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