On Thu, Jun 9, 2011 at 2:43 PM, Josh Doe <[email protected]> wrote: > I've gone ahead and cleaned up the NHD page a bit. > > I've also looked at the data, and I must say I'm confused! One river > is represented in the flh file as waterway=stream, in arhi as > waterway=riverbank, in flmd as waterway=stream (but with worse spatial > accuracy than flh), and then in armd as waterway=riverbank! I suppose > one of the waterway=stream's should be changed to waterway=river, and > only one of the waterway=riverbank objects should be used. > > Is this really what the NHD data is like? It will take more time than > I thought to properly merge these these 6 or 7 layers. > > Yes. You should only be using "high" resolution. "High" resolution is already a bit too low for OSM and "medium" is even worse. The "area" dataset consists of polygons that represent rivers wider than a certain cut-off width. Below that width they are represented only as flowlines. Above that width they are represented as flowlines of type "artificial" and a polygon in the "area" dataset.
I would suggest reading the NHD data description. It's only a few pages of text if you skip some of the code/type mappings. > If I am confused, then please enlighten me. Preferably by putting it > in the wiki :) > http://wiki.openstreetmap.org/wiki/NHD >
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