[Mapserver-users] Line/Polygon Rendering
Dean Gadoury
gadoury@dmsolutions.ca
Fri, 08 Aug 2003 11:05:18 -0400
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You can use classes and expressions in your mapfile to achieve this.
Here is a simple example. Note that there are different kinds of
expressions you can use and they are documented in the mapfile reference.
LAYER
NAME "Lakes"
DATA "lakes"
TYPE POLYGON
STATUS ON
CLASSITEM "DEPTH"
CLASS
NAME "Deep Lakes"
EXPRESSION ([DEPTH] > 100)
STYLE
COLOR 182 226 243
END
END
CLASS
NAME "Shallow Lakes"
EXPRESSION ([DEPTH] < 100)
STYLE
COLOR 192 236 253
END
END
END
Kevin Ravno wrote:
>
>
> Hi everyone
>
> I am sure this must be possible but havent found how to do it.
> I am trying to render lines/polygons based on a field criteria (for
> example--if I have a shapefile of lakes with an attribute field of
> 'depth', I am trying to get deeper lakes to display in darker blue.)
>
> I have looked at the layer definitions in
> http://mapserver.gis.umn.edu/doc36/mapfile-reference.html but havent
> found how to render a layer.
>
> have I missed it or is this something that I need to do with
> Perl/mapscript or something.
>
> Regards
> Kevin
>
>
>
>
>
--
___________________________
Dean Gadoury
DM Solutions Group
72 Chamberlain Ave. Third Floor
Ottawa, Ontario. K1S 1V9
613 565-5056 ext. 24
gadoury@dmsolutions.ca
www.dmsolutions.ca
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You can use classes and expressions in your mapfile to achieve this.
Here is a simple example. Note that there are different kinds of
expressions you can use and they are documented in the mapfile
reference.<br>
<br>
LAYER<br>
NAME "Lakes"<br>
DATA "lakes"<br>
TYPE POLYGON<br>
STATUS ON<br>
CLASSITEM "DEPTH"<br>
CLASS<br>
NAME "Deep Lakes"<br>
EXPRESSION ([DEPTH] > 100)<br>
STYLE <br>
COLOR 182 226 243<br>
END<br>
END<br>
CLASS<br>
NAME "Shallow Lakes"<br>
EXPRESSION ([DEPTH] < 100)<br>
STYLE <br>
COLOR 192 236 253<br>
END<br>
END <br>
END<br>
<br>
Kevin Ravno wrote:<br>
<blockquote type="cite"
cite="mid081722EBADADD5118F9000D0B7B6A3E765C6D8@mail.gims.com">
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<title>Line/Polygon Rendering</title>
<br>
<br>
<p><font size="2" face="Arial">Hi everyone</font>
</p>
<p><font size="2" face="Arial">I am sure this must be possible but
havent found how to do it. </font>
<br>
<font size="2" face="Arial">I am trying to render lines/polygons
based on a field criteria (for example--if I have a shapefile of lakes
with an attribute field of 'depth', I am trying to get deeper lakes to
display in darker blue.) </font></p>
<p><font size="2" face="Arial">I have looked at the layer definitions
in <a href="http://mapserver.gis.umn.edu/doc36/mapfile-reference.html"
target="_blank">http://mapserver.gis.umn.edu/doc36/mapfile-reference.html</a>
but havent found how to render a layer.</font></p>
<p><font size="2" face="Arial">have I missed it or is this something
that I need to do with Perl/mapscript or something.</font>
</p>
<p><font size="2" face="Arial">Regards</font>
<br>
<font size="2" face="Arial">Kevin</font>
</p>
<br>
<br>
<br>
<br>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
___________________________
Dean Gadoury
DM Solutions Group
72 Chamberlain Ave. Third Floor
Ottawa, Ontario. K1S 1V9
613 565-5056 ext. 24
<a class="moz-txt-link-abbreviated" href="mailto:gadoury@dmsolutions.ca">gadoury@dmsolutions.ca</a>
<a class="moz-txt-link-abbreviated" href="http://www.dmsolutions.ca">www.dmsolutions.ca</a></pre>
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