In some maps that I render, I want to show the divide between a couple of major river basins. (I have a good DEM for the area in question and can derive the line readily.)
In light of the recent thread on topographic prominence, I wonder if this is sufficiently interesting information at least to push it to OSM. (If not, that's fine, I have a PostGIS database and a bucket of shapefiles and know what to do.) If it is sufficiently interesting, the question then arises: how to map/tag it? 'natural=ridge' comes to mind, and the divide in question has a local name. (The 'Catskill Divide' separates the basins of the Hudson and Delaware Rivers.) This approach appears to run into problems, as I read the Wiki. I see: > The way should connect saddle points and peaks, and the arrows should point > upwards. That may be all right for a ridge ascending the flank of a single mountain, but what I'm talking about is the spine of a range, with the ridge traversing dozens of named peaks. Even with a single mountain, if there are false summits, the arrows on a single way cannot point upward all the time! (And the wiki is clear that the Do I misread, and should the reading instead simply be that the arrowhead should be higher than the arrow tail? In that case, I could break the divide into two ways, with a common endpoint at the highest summit in the range. Consider this a low-priority item. I have (or will have - there is a bit of debugging yet) the data. I know how to render them. I'm happy enough with a shapefile or a private PostGIS table if others aren't interested. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
