[Talk-us] 25or6to4 NHD imports

[Werner Poppele]

Toby Murray wrote:
> From: Jason Straub [mailto:straub20 at yahoo.com]
>> Sent: Thursday, May 03, 2012 1:44 AM
>> To: talk-us at openstreetmap.org
>> Subject: Re: [Talk-us] 25or6to4 NHD imports
>>
>>
>>
>> Howdy,  After discussion with Toby, I am updating the list with my import
>> efforts.  First, hopefully this message goes through, as none of my previous
>> ones have worked...  Second, was introduced to a better way to create a new
>> account, so the TexasNHD account will be used for uploads.  Third, I have
>> been taking the NHD shapefiles, pulling out only the areas more than 0.5
>> km^2 for this round of uploads.  This edited shapefile was run through
>> shp-to-osm.jar with the NHD rules file on the wiki, then uploaded piece by
>> piece through JOSM.  For error checking, have then redownloaded the areas
>> that were uploaded and doublechecked for errors/open ways/dupe notes/etc.
>>   Once (if) we have minutely diffs going into the APIs, I will do a
>> triplecheck for any more glitches.
> Thanks for explaining your process a little. It does sound like you
> are doing some good work and being careful about things. The bit of
> visual checking I did around Toledo Bend Reservoir showed that your
> outline was substantially better than what was there before (I think
> PGS, so no surprise I guess) so keep up the good work.
>
> As Paul mentioned, there are some subtleties in the NHD data. I know
> in some areas, pretty much all linear features were imported as
> waterway=river even for small things that should have been
> waterway=stream or something else. This became glaringly obvious when
> the osm.org stylesheet was updated to render rivers at a lower zoom
> level and northern California went completely blue from all the
> "rivers" - so something to watch for if you start venturing to other
> NHD data.
>
> Toby
>
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Looks good but there are many (> 100) objects without any tag - islands 
I guess and many existing islands are not member of the multipolygon 
forming the lake.

WernerP