[Talk-us] NHD data import question

[Ben Supnik]

Hi Y'all,

What qualifies as too many nodes?  Do we have metrics for this?  I can 
apply some kind of simplification if we can quantify what we want...

cheers
ben

On 4/28/11 4:34 PM, Alan Millar wrote:
>> I've been checking some of the imported data and my general feel is that it is
>> overdigitized.  I don't know if medium versus high reflects just the quality or
>> the amount of digitization.  That would be something to check.  One could also
>> just run some sort of simplification algorithm on all the data.
>
>
> I definitely found this to be the case for some parts of the
> area I did (Washington County, Oregon).
>
>
> I particularly remember it on
> areas like ponds and lakes; not so much on rivers and streams.  Most of them were reasonable, but a fair
> number of them had way too many nodes.
>
>
> I used the JOSM "simplify way" quite a bit, which worked perfectly in my opinion.
>
> It may be analogous to TIGER, in that NHD may have a composite dataset that got created in multiple ways.  It may show up more in some places than others.
>
>
> - Alan
>
>
> _______________________________________________
> Talk-us mailing list
> Talk-us at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk-us
>

-- 
Scenery Home Page: http://scenery.x-plane.com/
Scenery blog: http://www.x-plane.com/blog/
Plugin SDK: http://www.xsquawkbox.net/xpsdk/
X-Plane Wiki: http://wiki.x-plane.com/
Scenery mailing list: x-plane-scenery at yahoogroups.com
Developer mailing list: x-plane-dev at yahoogroups.com