[Talk-us] NHD accuracy on ski slopes (Winter Park, CO)

SteveC steve at asklater.com
Wed Feb 10 16:45:05 GMT 2010


Yeah they're 46006, which is wrong. So looks like I can kill them after triple checking with a local.


On Feb 10, 2010, at 9:37 AM, Ian Dees wrote:

> On Wed, Feb 10, 2010 at 10:27 AM, SteveC <steve at asklater.com> wrote:
> How accurate is NHD data?
> 
> I have a lot of streams going approximately down ski runs in CO here:
> 
>        http://www.openstreetmap.org/?lat=39.8671&lon=-105.7518&zoom=14
> 
> (yes the ski runs need mapping too)
> 
> There's no streams for many of those there in winter. I'm pretty sure summer is the same but I will check with people who know the area well.
> 
> Take a look at the nhd:fcode. If the fcode is 46006, then it should exist year-round (perennial), if it's 46003, it should be marked as intermittent (i.e. it might not exist in winter).
>  
> 
> If it turns out they don't exist, is it safe to kill them or might they actually be underground rivers now? And, does NHD know about underground rivers, and what should they be tagged if so?
> 
> NHD does know about underground pipelines, but underground rivers don't have an fcode.
>  

Yours &c.

Steve





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