[Talk-us] NHD data conversion

[Ben Supnik]

Hi Ben,

I think the answer is: we're part way there.

I was able to get my work-flow for conversion working and did do a 
complete conversion, which is uploaded here.

http://bsupnik.dev.openstreetmap.org/NHD/

So first: if anyone looks at these and finds things that aren't so good, 
please let me know, I'll recut!  But if I remember, one of the issues 
was that there was linework that was imported _only_ because it had an 
NHD id - I'm using Ian's java tool to do the shapefile->osm conversion 
and it doesn't have a way (that I know of) to say "if the only tag 
present is X, just skip".  (Ian: if you have a patch or trick for this 
please let me know.)  I don't have enough of a dev setup to work on 
Ian's code, and I haven't had time to put my own pre or post processing 
filter on the data.

Second: the consensus seemed to be that there wasn't a great way to get 
this data _in_ to OSM.  Each HUC is complex enough that the upload risks 
failing on the servers part way through if sent in its entirety.  I 
spoke with RichardF a little bit about teaching Potlatch to use the data 
as a vector layer, but I'm not sure where we are with that.

(RichardF: if you have a layer format or layer format + manifest HTML 
file that you like/support, I will simply conform my bulk conversion to 
your needs!)

So...you're welcome to work with the data as is...you may need to 
artificially break up the HUC and work on it in parts (to keep the total 
change set size down) and then individually push up finished work as you 
verify it.

cheers
ben

On 8/18/11 5:35 PM, Ben Miller wrote:
> I was watching with anticipation the conversation about pre-converting
> NHD data for the whole US, but it seems to have died down since June. I
> think I'm the target audience for this effort (I'm willing to put in
> time merging the data in carefully, but I'm not conversant in the
> command-line tools to prepare it) so I'm curious what the status is.
>
> -- Ben
>
>
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