Apparently it is a known problem for OS data to not line up with Bing Maps service and in order to get round this you have to re-project all your British National Grid data to the WGS 1984 Web Mercator (Auxiliary Sphere) coordinate system. How rubbish is that!
Anyway this problem is apparently known to ESRI and it is apparently fixed in verison 10 (it was tested by ESRI support in a beta 10 version). So I guess we will have to wait until thats out and a few service packs have been released until we can feel confident with rolling out version 10.
On that note I’ll talk about this issue in about another year to 18 months (I would have thought!)
(Using ArcGIS Server 9.3.1.)
Creating an mxd in ArcMap with some Mastermap data and then publish this with a Bing Maps Layer in AGS Manager will cause the Mastermap data to not line up with the imagery.
- Bing Maps service is served up in projection system – WGS 1984 Web Mercator.
- MasterMap is in British National Grid coordinate system.
One way of definitely getting the data to line up is to use the Project tool in ArcToolbox. This will change the actual coordinates of the data to “transform” from OS Grid to WGS84 coordinates. You may find however that this is creates a lot of overhead to keep updating your datasets to WGS84 – especially if they are dynamic layers rather than static background mapping.
I am still researching a better way to try to solve this problem.