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
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