Hi all, When you say 'ocean water polygons', I guess you are talking about modifying natural=coastline ways (PGS or others) that define oceans among other things using/for Canvec data?
I usually prefer to keep the original data and make it fits on the (assumed better) reference data. Furthermore, playing with natural=coastline feature might be tricky - because it does not tolerate gap in it. So, except for 'river mouth', I would consider to alter the original coastline by fitting it on Canvec features that define high water level. For intermittent water (reef, sand or other) I use the water cover proposed feature http://wiki.openstreetmap.org/wiki/Proposed_features/Water_cover - Read http://wiki.openstreetmap.org/wiki/Talk:Proposed_features/Water_cover Unified proposition. However, sometime it does not make sense because it is too complex/tedious! We are doing that fun! aren't we? In such case - if the procedure above seems more complex than the following: - Replace the coastline by the corresponding segment of the water polygon; - Replace natural=water tag by natural=coastline; - Make sure all coastline ways are linked/snapped together; - Clean up the mess! For river mouth - because the coastline should stop somewhere ... I would clip the shoreline (and join the two segment together) before replacing the river's shoreline with water polygon. et bla,bla,bla ... Cheers, Daniel -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Sam Vekemans Sent: July-09-10 01:22 To: Talk-CA OpenStreetMap Subject: [Talk-ca] 001k - coastline Hi all, Thanks Daniel, On the #osm-ca IRC we were trying to figure out the best solution for 'ocean water polygons'. Its basically this, if the body of water is a 'bay' or 'river mouth' or has 'reefs' or 'no flow coastal water', then we use the natural=water polygon, and just smooth out the jagged edges. Daniel did this on a more conservative way so its even better. Its up for debate, and one of those things that we will notice after the map is more complete. Another option, is to streatch out the water, just as far as where the 'deep ocean' starts. We have a WMS layer which shows this. This allows for the naming of these water areas. Cheers, Sam -- Twitter: @Acrosscanada Blogs: http://acrosscanadatrails.posterous.com/ http://Acrosscanadatrails.blogspot.com Facebook: http://www.facebook.com/sam.vekemans Skype: samvekemans IRC: irc://irc.oftc.net #osm-ca Canadian OSM channel (an open chat room) @Acrosscanadatrails _______________________________________________ Talk-ca mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-ca _______________________________________________ Talk-ca mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-ca
