[Talk-GB] OS Boundaries

Chris Hill osm at raggedred.net
Tue Apr 20 15:53:05 BST 2010


Jerry Clough - OSM wrote:
>
> Here's the format used, the addition being the TOWGS84 section:
>
> PROJCS["British National Grid (ORD SURV GB)", GEOGCS["unnamed", 
> DATUM["D_OSGB_1936", SPHEROID["Airy - 1848",6377563,299.319997677743], 
> TOWGS84[446.448,-125.157,542.060,0.1502,0.2470,0.8421,-20.4894]], 
> PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]], 
> PROJECTION["Transverse_Mercator"], 
> PARAMETER["latitude_of_origin",49],  PARAMETER["central_meridian",-2], 
> PARAMETER["scale_factor",0.9996012717],  
> PARAMETER["false_easting",400000], 
> PARAMETER["false_northing",-100000], UNIT["METER",1]]

Your addition works very well on the couple of parish boundaries I've 
checked by eye. I'll do some more checks this evening and confirm it for 
a wider area.

Thanks for your help,
Cheers, Chris




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