OpenStreetmap HADW wrote:
> Does mapserv use OSTN02?
As Tom has just told you, it uses a GDAL VRT with the source
projection defined by:
PROJCS["OSGB 1936 / British National Grid",
GEOGCS["OSGB 1936",
DATUM["OSGB_1936",
SPHEROID["Airy 1830",6377563.396,299.3249646000044,
AUTHORITY["EPSG","7001"]],
TOWGS84[375,-111,431,0,0,0,0],
AUTHORITY["EPSG","6277"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4277"]],
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["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","27700"]]
I have looked Really Hard at this and I don't see the entire OSTN02 table in
there. I might be missing something so will continue to stare hard at it.
Frankly all of this is a vast distraction; the tiny amount of alleged
"inaccuracy" resulting from all of this is about one-zillionth of the click
accuracy of your average OSM tracing monkey. If you're really concerned with
improving OSM accuracy then there are lots of roads in rural Wales out by
>50m that could do with realigning.
cheers
Richard
P.S. everyone else on this list is identifiable by their real name. It would
be lovely if you were too, thank you :)
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