[Talk-us] Proposed cleanup: NHD "rivers"

[Paul Norman]

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:jumbanho at gmail.com]
> Sent: Sunday, March 20, 2011 4:42 PM
> To: talk-us at openstreetmap.org
> 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.
> >
> >
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