[Openstreetmap] UK railways
tylermitchell at shaw.ca
Wed Jan 18 17:05:32 GMT 2006
I'm just curious, do you have multi-scale data representations? That is, do you maintain a set of data that is less accurate but suitable for, say, continental mapping?
Of course if you have fine resolution information you can always dumb it down. But someitmes all you can get are interpretations off Landsat - have you considered throwing that data into a different "lo-res" layer instead? Just curious how you've thought through this in the past.
----- Original Message -----
From: Andy Robinson <Andy_J_Robinson at blueyonder.co.uk>
Date: Wednesday, January 18, 2006 8:35 am
Subject: RE: [Openstreetmap] UK railways
> It's a mixture; a lot of the recent edits for the UK appear to be
> basedloosely 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.
> Overall though, the error is relatively small (probably sub 50m in
> mostcases) so in a global sense it's still pretty accurate.
> Andy Robinson
> Andy_J_Robinson at blueyonder.co.uk
> >-----Original Message-----
> >From: openstreetmap-bounces at vr.ucl.ac.uk [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.
> >Where are we going? And WHY ARE WE IN THIS HANDBASKET?!!
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