Re: [mapserver-users] OGC spatial filter + SLD

[Julien Cigar]

On 11/24/2012 14:23, Julien Cigar wrote:
On 11/23/2012 19:12, Thomas Gratier wrote:
Hello,

Hello,

Don't know exactly your case but you can maybe rely on runtime 
substitution http://mapserver.org/cgi/runsub.html and spatial 
abilities of your database e.g 
http://postgis.refractions.net/docs/ST_Within.html
or on filter (support within 
http://mapserver.org/mapfile/expressions.html#spatial-expressions-that-return-a-logical-value-geos 
) + runtime substitution
In all case, a bit dirty compare to SLD filter but no choice it seems.


I'm slowly progressing on this issue:

- I can confirm that Mapserver supports OGC spatial filters to filter 
WMS requests (so far I've tested with <ogc:BBOX> and <ogc:Within>. The 
filter is converted to an EXPRESSION clause in the Mapfile by Mapserver
for example: EXPRESSION ([shape]  within  fromText('POLYGON 
((24.2073126960992191 0.7680569582964826, 24.2968673039010241 
0.7680569582964826, 24.2968673039010241 0.8576025453261950, 
24.2073126960992191 0.8576025453261950, 24.2073126960992191 
0.7680569582964826))'))

- it seems that there is an obscure bug in the parsing code for the 
<gml:coordinates> tag:

The following works:
<ogc:BBOX>
<ogc:PropertyName>geom</ogc:PropertyName>
<gml:Box srsName="http://www.opengis.net/gml/srs/epsg.xml#4326";>
<gml:coordinates decimal="." cs="," ts=" ">24.207313,0.768057 
24.296867,0.857603</gml:coordinates>
</gml:Box>
</ogc:BBOX>

BUT, if there is a space (or a newline) in the <gml:coordinates 
decimal="." cs="," ts=" "> content it doesn't work, so the followings 
don't work:
<gml:coordinates decimal="." cs="," ts=" "> 24.207313,0.768057 
24.296867,0.857603 </gml:coordinates>

<gml:coordinates decimal="." cs="," ts=" ">
   24.207313,0.768057 24.296867,0.857603
</gml:coordinates>

(...)

HOWEVER, this problem doesn't appear in an <ogc:Within>, in any case 
the <gml:coordinates> is parsed correctly:

So the following works:

<ogc:Within>
<ogc:PropertyName>geom</ogc:PropertyName>
<gml:Polygon srsName="http://www.opengis.net/gml/srs/epsg.xml#4326";>
<gml:outerBoundaryIs>
<gml:LinearRing>
<gml:coordinates decimal="." cs="," ts=" ">
             24.20731269609922 0.7680569582964826,24.296867303901024
             0.7680569582964826,24.296867303901024 
0.857602545326195,24.20731269609922
             0.857602545326195,24.20731269609922 0.7680569582964826
</gml:coordinates>
</gml:LinearRing>
</gml:outerBoundaryIs>
</gml:Polygon>
</ogc:Within>

For readability I've pasted the code on http://pastie.org/5427465

Could someone confirm this is a bug .. ?


Another problem now: it seems impossible to combine a spatial filter 
with a non-spatial filter (filters are simply ignored)
Any idea ..? My SLD file is here: http://pastie.org/5437516 and I've 
tried with GML2 and GML3

Julien

Regards

ThomasG

Regards,
Julien

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