http://www.edparsons.com/2006/04/osgb-national-grid-get-it-here-for-free/ The blog of Ed Parsons, Geographer. Mon, 06 Feb 2012 22:11:39 +0000 hourly 1 http://wordpress.org/?v=3.3.1 http://www.edparsons.com/2006/04/osgb-national-grid-get-it-here-for-free/#comment-348 geometrybag » OSGB transformations inside ArcGIS Wed, 03 May 2006 14:46:27 +0000 http://www.edparsons.com/?p=225#comment-348 [...] I was chatting to someone about projections inside ArcGIS last week and also reading here, (a SOAP service as well as the ASP app would be cool) and realised that a lot of people do not necessarily know that ArcGIS supports a number of different transformations for converting from WGS84 to OSGB36 and that these have different levels of error. ArcGIS supports the standard EPSG projections and transformation methods between the 2 coordinate systems. If you add data that is in WGS 84 or Lat/Long to an ArcMap project that is in British National Grid (Or the other way around) you will usually see the following dialog box [...] [...] I was chatting to someone about projections inside ArcGIS last week and also reading here, (a SOAP service as well as the ASP app would be cool) and realised that a lot of people do not necessarily know that ArcGIS supports a number of different transformations for converting from WGS84 to OSGB36 and that these have different levels of error. ArcGIS supports the standard EPSG projections and transformation methods between the 2 coordinate systems. If you add data that is in WGS 84 or Lat/Long to an ArcMap project that is in British National Grid (Or the other way around) you will usually see the following dialog box [...]

]]>