bob at randomness.org.uk
Wed Feb 21 11:19:00 GMT 2007
On Wed, 21 Feb 2007, Graham Seaman wrote:
> Hi all,
> I'm trying to generate a set of latitude/longitude points for use with google
> maps (to avoid having to query google for the actual locations). What I have
> as source data is a set of northing/easting values with 6 digits for
> northing, 6 digits for easting. I'm using Geography::NationalGrid::GB to
> convert these to lat/long pairs. The results are all approximately correct,
> but generally about 20 metres or so off in an apparently random way. The
> features I'm trying to locate are mostly quite large and clearly visible on
> google's satellite/hybrid view (but I have around 20,000 locations to deal
> with, so can't correct them all manually). I have seen the same features
> located accurately on another google map application, so I know the problem
> is not at the google end of things.
its the ellipisoid.
will help you.
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