[OpenLayers-Users] OSM, ArcGIS 10.1 WMS and clipping

[Chris Jackson]

Hi all

I have a couple of questions.  First off, I am looking at loading OSM as a
baselayer, and also offer one or two homebrew ArcGIS server 10.1 WMS
baselayers as reference backdrops for digitising polygons.  I have
EPSG:900913 as the map projection and EPSG:4326 as the display projection
(and for all my point/polygon work).

What SRS should I be configuring my new ArcGIS WMSs with (one containing
WGS84 data and another containing OSGB data)?

To date I have had issues with pink squares etc - which I am sure is me
using incorrect projections/transformation combinations.  What are the
correct EPSG codes to use to get such data showing correctly in OpenLayers
with least amount of transformation overhead?

Secondly I was going to clip my polygons in SQL Server 2008 post save,
having said that can OpenLayers clip a digitised polygon based on any
overlap with another layer client-side - e.g. coastline?

Many thanks in advance

Chris
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