> -----Opprinnelig melding-----
> Fra: mapserver-users-boun...@lists.osgeo.org
> [mailto:mapserver-users-boun...@lists.osgeo.org] På vegne av
> Heiko Schröter
> Sendt: 15. april 2009 13:52
> Til: mapserver-users@lists.osgeo.org
> Emne: [mapserver-users] Use of a Colortable
>
> Hello,,
>
> we are mapping global satellite data with postgis.
>
> Is it possible with mapserver to change the color of the
> symbol according to the value read in from postgis ?
> Now the color is fixed within the mapfile reading only the
> geolocations i.e.
>
> LAYER
> CONNECTION "user=bla password=blub dbname=foo host=fum"
> DATA "geocenter from table1"
> CLASS
> COLOR 50 150 150
> SYMBOL "circle"
> SIZE 5
> END
> END
You can do something like this:
CLASS
NAME "Higher than 100"
EXPRESSION ([column_name] >= 100 )
COLOR 0 0 0
SYMBOL "circle"
SIZE 5
END
CLASS
NAME "Lower than 100"
EXPRESSION ([column_name] < 100 )
COLOR 50 50 50
SYMBOL "circle"
SIZE 5
END
...
>
> My (maybe/probably ill) idea is something like:
> ...
> DATA "value and geocenter from table1"
> ...
> COLOR on value using "/dir/my_colortable.dat"
> SYMBOL "circle"
> ...
>
> But it looks like that only one coloumn of the GIS Table
> could be read for a given LAYER.DATA statement.
>
> Thanks for any suggestion.
>
> Regards
> Heiko
The "geocenter" in the DATA line only defines the geo column in the table. All
other columns in table can be accessed with brackets like: [column_name]
Regards,
Espen
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