2009/4/29 Alice Kaerast <kaer...@qvox.org>: > On Wed, 29 Apr 2009 11:25:20 +0100 > mle <i...@dynoyo.plus.com> wrote: > >> I was staying very near the east coast, and noticed that tracks near >> the coast appeared too far inland (further west than expected) when >> the GPS tracks were plotted. They also seemed too far inland when >> looking at the Yahoo background layer in Potlatch. > > Align the Yahoo imagery with your traces, as it's not always aligned > correctly initially. The imagery only ever gives an idea of what is on > the ground, we don't the state of the tide when the imagery was taken, > there may have been coastal erosion or sea rising/falling since then, > etc. > > You seem confident that your traces are accurate, don't worry about > editing existing coastline data if you believe it is incorrect. And > remember the coastline should show the mid-tide level. > > -- > Alice >
Talking of the tide, How should Tidal Roads be marked, The main road the Holy Island in the UK is just tagged Note: Tidal. which just does not seam right. I'm thinking there must be quite a few Roads, Paths etc that can only be used at high tide. Not being anywhere near it I don't feel it right to correct it however.... Peter. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
