HI Christian,
This GeoServer thing sounds quite interesting, I'll have to give it a try.
;-)
Well, it's not meant for that but you can do it.
and in the best spirit of traditional hacking, it works great.
----
Onto the problem. It seems I may have copied/pasted a "broken" one into the
"working" in my original email. Ooops.
So I did it again using the same layer with:
> <se:MaxScaleDenominator>40000</se:MaxScaleDenominator>
The *GetMap *request that precedes the GetFeatureInfo. This *Works*.
>
> http://wppgeog3/geoserver/ows?buffer=5&LAYERS=OS_CP_POLYGON_POSTCODES&TRANSPARENT=TRUE&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A27700&INFO_FORMAT=application%2Fvnd.ogc.gml&BBOX=424372,259328,441272.8,272415.2&WIDTH=1509&HEIGHT=1168
The tool says this has a scale of *400017.123*... - I've re-entered the
numbers twice and can confirm that's what the Gridset says the scale is. So
at least in theory, it shouldn't be responding with the map but is.
----
Then I do the *GetFeatureInfo*. This *doesn't work*.
>
> http://wppgeog3/geoserver/ows?buffer=5&LAYERS=OS_CP_POLYGON_POSTCODES&QUERY_LAYERS=OS_CP_POLYGON_POSTCODES&STYLES=&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetFeatureInfo&BBOX=427188.8%2C261509.2%2C438456%2C270234&FEATURE_COUNT=50&HEIGHT=779&WIDTH=1006&FORMAT=image%2Fpng&INFO_FORMAT=application%2Fvnd.ogc.gml&SRS=EPSG%3A27700&X=454&Y=362
The tool says this has a scale of 40,000.000000000044.
---
If I change my SLD to:
> <se:MaxScaleDenominator>4000*1*</se:MaxScaleDenominator>
That GetFeatureInfo now works!
So the problem looks very much like a rounding issue. For whatever reason
the GetMap requests are extremely lax in their tolerance of the SLD scale,
but the GetFeatureInfo is incredibly strict to the tune that a rounding
error in the hundreds of billionths is enough to disallow it.
I've created a JIRA issue for this -
http://jira.codehaus.org/browse/GEOS-5961 - I'm surprised this hasn't come
up before; we're using an OpenLayers based client so I can't be the first
person to encounter it.
Thanks again!
Jonathan
On 8 August 2013 01:35, cmaul <[email protected]> wrote:
> Jonathan,
>
> I noticed I took the wrong values (i.e. the ones that worked). The other
> values end up with exactly the same scale: 1 : 40,000.00000000022
>
> So from the point of view of Geoserver, both are identical and both are
> slightly above. However, the principle of how you can use the 'create
> gridset' sort of creatively is correct. So, very likely it is not the scale
> or rounding, but try it with 40010, to exclude that it isn't.
>
> Cheers
>
> Christian
>
>
>
> -----
> ____________________________
>
> Dr Christian Maul
> Project Manager
>
> Information Services Branch
> Department of Sustainability and Environment
> Level13, Marland House, 570 Bourke Street
> Melbourne 3000
>
> PO Box 500, East Melbourne Vic 3002
>
>
> Telephone: +61-3-8636 2325
> Telefax: +61-3-8636 2813
> --
> View this message in context:
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> Sent from the GeoServer - User mailing list archive at Nabble.com.
>
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