[Openstreetmap] UK railways

[Andy Robinson]

It's a mixture; a lot of the recent edits for the UK appear to be based
loosely on a mixture of low density gps points and the Landsat. Each
motorway trip I've done I've gone back over and re-edited the original
segment placement done by others. In the case of the M54 a couple of weeks
ago I had to shift both lines a lot because it was originally drawn with
reference to one low density gps track and the editor obviously picked the
wrong direction for the carriageway assumption. The error is still there to
the west of Telford because that's as far as I went on that trip.

http://www.openstreetmap.org/edit.html?lat=52.6800951425023&lon=-2.413011147
583&zoom=15

Overall though, the error is relatively small (probably sub 50m in most
cases) so in a global sense it's still pretty accurate.

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

>-----Original Message-----
>From: openstreetmap-bounces at vr.ucl.ac.uk [mailto:openstreetmap-
>bounces at vr.ucl.ac.uk] On Behalf Of Jonathan McDowell
>Sent: 18 January 2006 15:58
>To: openstreetmap at vr.ucl.ac.uk
>Subject: Re: [Openstreetmap] UK railways
>
>On Mon, Jan 16, 2006 at 01:15:28PM -0000, Jon Stockill wrote:
>> Inspired by the amount of work done creating motorways from the lansdat
>> data I set about doing the same for railways,
>
>Have the motorways really been added by landsat rather than recorded GPS
>points? Doesn't that imply there could be a lot of error in them?
>
>I did a lot of the M11 and I used GPS points I'd taken myself. I'd been
>assuming that's what others were doing as well.
>
>J.
>
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