Thanks for the confirmation Daniel. Now I've got to go back over a rather large area to make sure it is all correct.
On Mon, Sep 12, 2011 at 10:13:50PM -0400, Daniel Begin wrote: > Bonjour James, sorry for the delay. > > About your example, I couldn't have shown it better! > > The procedure I use ... > - All features having a natural=water tag are dissolved together before > creating a coastline feature. > > - The features having natural=water and water=intermittent tags are copied > into another layer before being reintegrated after the creation of the > coastline feature. > > Daniel > > -----Original Message----- > From: James A. Treacy [mailto:tre...@debian.org] > Sent: September-08-11 13:59 > To: Daniel Begin > Cc: talk-ca@openstreetmap.org > Subject: Re: [Talk-ca] Using Canvec data to recreate or modify coastline > features > > Daniel, > I'd like to make this more concrete with an example. If you have canvec data > that shows: > llllllllllll this area is land > -i-i-i-i-i-i-i-i way which is natural=water;water=intermittent > iiiiiiiiiiii area with intermittent water > -w-i-w-i-w-i-w-i boundary with 2 ways. One is natural=water and > the other is natural=water;water=intermittent > wwwwwwwwwwww this area is water > > is this what OSM should have? > llllllllllll this area is land > -c-i-c-i-c-i-c-i boundary with 2 ways. One is natural=coastline and > the other is natural=water;water=intermittent > iiiiiiiiiiii area with intermittent water > -i-i-i-i-i-i-i-i way which is natural=water;water=intermittent > wwwwwwwwwwww this area is water > > Obviously, the ways would be closed but I think this gives the idea. > > On Mon, Sep 05, 2011 at 09:37:11PM -0400, Daniel Begin wrote: > > Hi all, > > > > Earlier today I was looking at coastline features modified to fit Canvec > > data and I found a problem with the "conversion". I think all of those who > > are converting coastline using Canvec data should be aware of the Canvec > > water data model... > > > > In Canvec data you will find two types of water polygons > (natural=water)... > > > > One type defines permanent water - an area that is always covered by the > > water. > > > > - It is tagged natural=water > > > > One type defines intermittent water - an area that is occasionally, but > not > > always covered with water. > > > > - It has two tags. One is the standard natural=water tag, the other is > > water=intermittent tag(1). > > > > > > > > The problem is that the coastline seems to be defined as the mean high > water > > level (MHWL) position(2). To create a coastline that meet the MHWL > position > > using Canvec, you must merge all natural=water polygon type before > > converting it to coastline. > > > > > > > > JOSM provides a good tool to merge those polygons - join overlapping area > > (Shift-J) > > > > > > > > > > > > Daniel > > > > > > > > > > > > > > > > 1 - http://wiki.openstreetmap.org/wiki/Proposed_features/Water_cover > > > > 2 - http://wiki.openstreetmap.org/wiki/Tag:natural%3Dcoastline and other > > wiki discussions > > > > > _______________________________________________ > > Talk-ca mailing list > > Talk-ca@openstreetmap.org > > http://lists.openstreetmap.org/listinfo/talk-ca > > > -- > James (Jay) Treacy > tre...@debian.org -- James (Jay) Treacy tre...@debian.org _______________________________________________ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
