[OpenLayers-Users] Resolutions with Geowebcache and WMSGetFeatureInfo [Sec=Unclassified]

[Miles Jordan]

Hi Andreas,

Thanks. That method works, but I was hoping I could get geowebcache to work so that clients that consume data from us can access both maps and getfeatureinfo from the one url. Ideally I would like to have geoserver completely inaccessible from outside the firewall, with geowebcache being the only way to access it. Your suggestion will do the trick for the time being though.

Regards,

Miles

Andreas Hocevar wrote:
> Hi,
>
> the problem I see with your approach is that
> OpenLayers.Control.GetFeatureInfo creates a GetFeatureInfo request for
> the map extent, not for a tile. I would recommend sending GetFeatureInfo
> requests to the underlying WMS, as explained in
> http://getsatisfaction.com/opengeo/topics/error_in_wmsgetfeatureinfo#r
> eply_2612983
>
> Regards,
> Andreas.
>
> On Jul 27, 2010, at 08:55 , Miles Jordan wrote:
>
>> Hi,
>>
>> I've been debugging a problem that I've been having with using the
>> WMSGetFeatureInfo control and GeoWebCache.
>>
>> Basically I am setting OpenLayers.DOTS_PER_INCH to 90.71428571428572
> which is what GeoWebCache expects by default, however when the
> WMSGetFeatureInfo request goes through to GeoWebCache it is like it's
> using the default 72 for DOTS_PER_INCH, because all of the resolutions
> are about 21% out.
>>
>> GeoWebCache responds with messages such as :"400: Requested
> horizontal resolution: 0.54931640625 , best match: 0.703125 exceeds
> 10% threshold. Perhaps the client is configured with an incorrect set
> of scales (resolutions), or the DPI setting is off compared to the one
> in GWC ?"
>>
>> I've actually just dropped the WMSGetFeatureInfo control into a
> GeoWebCache OpenLayers demo, so the resolutions are definitely set up
> to match. The full source (pretty short and simple) is at
> http://pastebin.com/JENnAPC9.
>>
>> I've brought it up on the GeoWebCache mailing list but now thinking
>> that it's more likely something to do with OpenLayers. Here's a link
>> to my messages: http://tinyurl.com/38jvcva
>>
>> It seems like the resolution would be calculated incorrectly by
> about that amount if the DOTS_PER_INCH were still at 72, so I'm
> wondering if there's another setting that I need to change or if
> there's a bug somewhere.
>>
>> Your comments are appreciated.
>>
>> Regards,
>>
>> Miles Jordan
>> Acting Manager / Systems Analyst
>> Australian Antarctic Data Centre
>> Australian Antarctic Division
>> Dept. of the Environment, Water, Heritage & the Arts
>>
>>
>>
>>
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>



Regards,

Miles



___________________________________________________________________________

    Australian Antarctic Division - Commonwealth of Australia
IMPORTANT: This transmission is intended for the addressee only. If you are not the
intended recipient, you are notified that use or dissemination of this communication is
strictly prohibited by Commonwealth law. If you have received this transmission in error,
please notify the sender immediately by e-mail or by telephoning +61 3 6232 3209 and
DELETE the message.
        Visit our web site at http://www.antarctica.gov.au/
___________________________________________________________________________