Name for 2. It might miss some rivers, but the data source doesn't differentiate between streams and rivers in any of the metadata.
3 is about making the rivers into single ways, more like a mapper would do by hand. I'm not really set on this step and if done it would be after steps 1 and 2 have been done everywhere. Looking at nhd:com_id it might cause problems with updating, so I'm thinking I'll drop this step for now. > -----Original Message----- > From: James U [mailto:[email protected]] > Sent: Sunday, March 20, 2011 4:42 PM > To: [email protected] > Subject: Re: [Talk-us] Proposed cleanup: NHD "rivers" > > 1 and 2 make sense to me. What criteria would you use for 2? I have > done a fair bit of NHD imports and simply used the name, i.e. XXXX > river, to classify rivers. Some parts of the country have different > naming traditions that others. > > What is the rationale for 3? > > > > > On Sunday, March 20, 2011 05:29:54 pm Paul Norman wrote: > > A mapnik rendering change has revealed a problem in some areas with > NHD > > imported waterways. An example of the problem is at > > > http://www.openstreetmap.org/?lat=45.3&lon=-123.3&zoom=9&layers=M > > > > Essentially, all the streams are tagged as waterway=river, with > > waterway=stream being used for what appear to be intermittent > streams. > > > > I propose doing the following changes. These changes would *only* be > done > > to ways that have not been modified since import. I have experience > with > > this type change from cleanup on Canadian NHN data. > > 1. Adding intermittent=yes to NHD streams. > > 2. Downgrading waterway=river to waterway=stream for non-rivers. > > 3. Joining rivers into a single way > > > > Steps 1 and 2 would be done in one set of imports while joining rivers > > would be done in a second pass. > > > > Spot checks in the area linked indicate this would cause no problems. > If > > verification with imagery was necessary I'd use MapQuest's Open Aerial > Map > > as it seems to be the highest quality in these remote areas. > > > > > > _______________________________________________ > > Talk-us mailing list > > [email protected] > > http://lists.openstreetmap.org/listinfo/talk-us > > _______________________________________________ > Talk-us mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-us _______________________________________________ Talk-us mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-us
