[Talk-us] NHD (usa) NHN canada

Sam Vekemans acrosscanadatrails at gmail.com
Mon Jan 12 02:18:29 GMT 2009


Hi,
Sorry i try again.

The method i describe seems to be a great way to deal with areas of
OSM contributed data -for the 1st stage. (like 'lake-of-the-woods'
where some sections have been done. By 'square-tiling (osmcut)' we can
isolate it to its smallest size, to make less manual work to fix.

For the 2nd stage, a program variation of 'roadmatcher' would work.

-ya... i'll draw a diagram to explain this better :-)

cheers,
Sam Vekemans
Across Canada Trails

On 1/11/09, Ian Dees <ian.dees at gmail.com> wrote:
> On Sun, Jan 11, 2009 at 7:04 PM, Sam Vekemans
> <acrosscanadatrails at gmail.com>wrote:
>
>> Hi,
>> I might be able to help (or confuse) :)
>>
>> By taking the converted gov'nt data shape files (as a ready OSM file)
>> and slice it into 16 squares, then compare each square to the existing
>> OSM data square, and only those squares that have no 'natural=water &
>> similar tags' you would import the data. Then square it off again and
>> import the 'no OSM Data areas'.
>> So then your left with only a few small squares that need to be traced.
>>
>> Does this make sence?
>>
>
> The data is already broken up into subbasins, which are usually all the
> water features that lead to some common river or lake.
>
> This way, there will be minimal amount of data overlap and crossover.
>
> Also, this is a fairly complete data set. I doubt we'll be able to find any
> water features that aren't already traced by the NHD data.
>




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