We are using OpenLayers for our GIS Application and we have base files from Ordinance Survey for UK maps.

For creating WMS layers, we are generating tiles of 256 x 256 through Sharpmap Library but facing issues when the base layer is Google or Bing.

We know Google uses EPSG:900913 projection and we are able to transform the projection from EPSG:900913 to OSGB36 successfully. For this we are using GeoTools.js methods to achieve the transformation.

But the issue is that the tiles being created are not projected properly. There is a slight misalignment at the connecting point of each tile with other tile.

  • 1
    Would you not be better off going the other way and transforming the OS data to 900913? Mar 1, 2011 at 11:20
  • 1
    It sounds like a violation of the Google ToS to go in this direction.
    – Ian Turton
    Mar 1, 2011 at 14:08


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