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

[Miles Jordan]

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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