Map showing International Date Line

WMS tiles not loading when map region crossing international date line(IDL)

I used Openlayers to load the map with GeoServer & GeoWebcache. Initially loaded layers to New Zealand region and then moved map to IDL(International date line) where longitude changes from +ve to -ve. Suddenly layers got missing even though base map showing part of New Zealand.

I did some further investigation to findout any issues with geoserver/geowebcache and finally with WMS Inspector plugin, i was able to see parameters passed by OpenLayers to backend, which confirmed the issue with OpenLayers.

Here some settings used to create OpenLayers Map: maxExtent: new OpenLayers.Bounds(-2.003750834E7, -2.003750834E7, 2.003750834E7, 2.003750834E7)

For example: And When used in zoom level 6, i was able to 42 WMS tile requests to GeoWebcache (7 latitute divisions * 6 longitude divisions) which has longitude parameters between 1.69...E7 to 2.003..E7 range (SRID 900913) even though visible map has 1.821..E7 to -1.990..E7 longitudes.

And when moved map to load more from -ve of longitude and found less number of tile requests such as 28 requests (7 latitute divisions * 4 longitude divisions).. Once center line move to -ve longitude area, it was totally loading on -ve longitude region tiles..

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  • To view this image on other products please search for code 7153905
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