On Mon, Jul 14, 2008 at 7:55 PM, Mark Gray <[EMAIL PROTECTED]> wrote:
> Sorry to speak up before finding that the thread was older than I > realized. I have now gone back and found the whole conversation that > has been taking place. I wasn't trying to be mean :). Just making sure you saw it. > It is beautiful to see in your sample some good hydrology going into OSM. > > I like populating as many existing OSM tags as possible, but would not > worry about trying to add NHD-specific attributes beyond COMID unless > they are useful for rendering. Keeping the COMID means anyone can > follow that to or from other NHD/NHDPlus data. People who are > concentrating on water issues will not be depending exclusively on OSM. > > Do you have any idea of how large a size addition to OSM this will end > up being? I am hoping it will not be so big as to make people complain > that a street map doesn't need detailed water. Maybe I shouldn't worry, > maybe nobody thinks the database growing is ever a bad thing. > I'm not too worried about data size (yet), but a single watershed is around 40MB of OSM XML data. There's a few thousand watersheds, right? So that's a few more gigabytes of data in their database. I might float the idea of not tagging every node with attribution and source, since that significantly increases database footprint. > > It will take some effort before I can tell quite how your script is > working, but I will take a look. > > Is the version here up to date: > > http://perrygeo.googlecode.com/svn/trunk/gis-bin/nhd_to_osm.py This is what I used to create the demo data that I linked to. > Are islands the only issue that seems to be holding things up or was > that just one example? Handling multiple geometries (multipolys and multilines) are pretty much the only thing left in my shapefile -> OSM converter. Once we have the data in OSM format, tagging it should be relatively easy (using JOSM or an XSLT transform before the data upload step).
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