Sorry everyone, found the problem. That zoom level was not in the gridset, I was looking at the wrong server (too many geoserver instances).
Hope no one wasted any time.
···
From: Kirk, Victor [mailto:VICTOR.KIRK@…7093…]
Sent: 10 December 2015 14:45
To: geoserver-users@lists.sourceforge.net
Subject: [Geoserver-users] GWC tile look up fails
Hi,
I have a gridset configured for british national grid EPSG: 27700, for a particular zoom level (resolution = 5.0) I get rectangular groups of valid tiles surrounded by large areas of missing tiles, yet all tiles appear if I zoom in or out to a different zoom level. The client is implemented with open layers and is initialised with zoom resolutions that match the gridset.
I’ve done the calculations and the requested bounds seem correct to me and don’t understand how GWC comes up with the reports tile index.
size
x1
y1
x2
y2
width
height
res x
res y
Tile x
Tile y
Result
256
0
0
700000
1100000
← Gridset Origin
387840
399360
389120
400640
1280
1280
5.00
5.00
303.00
312.00
Fails tile index = 272.72, 286.36
386560
399360
387840
400640
1280
1280
5.00
5.00
302.00
312.00
Works
The requests are below in order of the above table. Note, geoserver/wms is mapped to geoserver/gwc/service/wms by an apache proxy
http://xxxx/geoserver/wms?request=GetMap&service=WMS&VERSION=1.1.1&LAYERS=os-combined&CRS=EPSG%3A27700&FORMAT=image%2Fpng&TRANSPARENT=false&STYLES=&SRS=EPSG%3A27700&BBOX=387840,399360,389120,400640&WIDTH=256&HEIGHT=256
Returns 400: X,Y values for the tile index were calculated to be {275.45454545454544, 283.6363636363636} which had to be rounded to {275, 284} and exceeds the threshold of 10%. Perhaps the client is using the wrong origin ?
http://xxxx/geoserver/wms?request=GetMap&service=WMS&VERSION=1.1.1&LAYERS=os-combined&CRS=EPSG%3A27700&FORMAT=image%2Fpng&TRANSPARENT=false&STYLES=&SRS=EPSG%3A27700&BBOX=386560,399360,387840,400640&WIDTH=256&HEIGHT=256
Gives the expect tile.
Does anyone have an ideas what I’m doing ?
Kind Regards, Vic
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Victor Kirk
Senior Software Engineer
Cubic Transportation Systems (ITMS) Ltd
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