Hi user list ;),
I have the following problem: I want to retrieve data from a postgis database
and then I want to make a WMS request with a xml file but the filters are just
ignored or something like that. I've already tried the example population.xml
(http://trac.mapnik.org/wiki/XMLGettingStarted) but this one isn't working too
--> the map just stays blank. If I remove the filters in population.xml the map
is generated but not correctly.
My second problem is if I try to generate the map alternatively with
"nik2img.py" the filters arent working for my example but for the
population.xml example they are working. Why? I use the same pgsql queries as
the equivalent Mapserver example (this one is working) and the name of my
filter variable ([value]) should be correct too (see pgsql query snippet below):
query:
select the_geom from (select gd_poly_003.the_geom,gd_poly_003.id as id,
td_dim_geom.name as name,
gd_poly_003.oid,sum(cal_layer_0_katz5d5495cc2ba6236d214fe0d5e8ad354f.value::float/cal_layer_1_katzb201d59b428fc2b1bff23d3679a2e982.value::float)
as [b]value[/b] ...
And here's an example how all my filters are declared ( the values range from 0
to infinity):
<Rule>
<Filter>[value] > 500 and [value] < 1000</Filter>
<PolygonSymbolizer>
<CssParameter name="fill">#ef6548</CssParameter>
</PolygonSymbolizer>
</Rule>
And this shows how the above code snippet is implemented in Mapserver map file:
CLASS
NAME "> 500 - 1.000"
EXPRESSION ([value] >= 500 and [value] < 1000)
METADATA
END
STYLE
ANGLE 360
COLOR 239 101 72
SYMBOL 0
END
TEMPLATE "xxx"
END
Hope you could help me.
Thanks + best regards,
Martin
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