[Geoserver-devel] [jira] (GEOS-6128) On the fly metatiling can return repeated tiles at (very) high zoom levels

GeoServer GeoServer Developer
1

Andrea Aime created BugGEOS-6128
On the fly metatiling can return repeated tiles at (very) high zoom levels

Issue Type:

BugBug

Affects Versions:

2.4.1

Assignee:

Andrea Aime

Components:

WMS

Created:

31/Oct/13 5:37 AM

Description:

These two requests (sample data available) return the same tile:

http://localhost:8080/geoserver/ows?SERVICE=WMS&STYLES=line&FORMAT=image%2Fpng&TRANSPARENT=TRUE&TILED=true&TILESORIGIN=-20037508.34%2C%20-20037508.34&BUFFER=10&LAYERS=cite%3Afgn_con&EXCEPTIONS=XML&VERSION=1.3.0&REQUEST=GetMap&CRS=EPSG%3A900913&BBOX=1215736.8585492,5455476.1387128,1215739.2472063,5455478.5273699&WIDTH=256&HEIGHT=256
http://localhost:8080/geoserver/ows?SERVICE=WMS&STYLES=line&FORMAT=image%2Fpng&TRANSPARENT=TRUE&TILED=true&TILESORIGIN=-20037508.34%2C%20-20037508.34&BUFFER=10&LAYERS=cite%3Afgn_con&EXCEPTIONS=XML&VERSION=1.3.0&REQUEST=GetMap&CRS=EPSG%3A900913&BBOX=1215739.2472063,5455476.1387128,1215741.6358635,5455478.5273699&WIDTH=256&HEIGHT=256

The zoom level in this case is 23 of the Google tile system (in other words, the scale is 1:33, more CAD than GIS). There is a numerical precision issue computing the location of the tile in the metatile, which should be fixed by changing the way the computation is done.

Project:

GeoServer

Priority:

MajorMajor

Reporter:

Andrea Aime
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