[OSM-talk] US County and State Borders Was: Re: TIGER, which states next?

[80n]

For the east coast the state boundaries would also be a good first
approximation of the coastline if it were tagged as such.

Should the boundaries actually be coastline where they run along the coast,
or are there some subtle differences between the extent of state borders and
the physical coastline?

80n


On 10/24/07, Ted Mielczarek <ted at mielczarek.org> wrote:
>
> On 10/24/07, Adam Schreiber <sadam at clemson.edu> wrote:
> > Does the data for the counties and state borders come from a data
> > source that could be imported into OSM?  I realize information freeway
> > has state boundaries at low zoom levels but they disappear as you zoom
> > in.  County boundaries would be busy at low zoom levels, but might be
> > more approrpate at "state" level zooms.
>
> Yep, they're all TIGER data, provided as shapefiles by the Census
> bureau.  I've already imported the state boundaries for the northeast
> of the US, you can see them in mapnik as dashed red lines.  I didn't
> just throw them all in willy-nilly, I split the borders into sections
> so I could label them left:state and right:state, and I deleted
> overlapping border sections.  Sort of time consuming, but I thought
> that trying to do it after the fact would be a pain given the scale of
> the data.  I wanted to see what they looked like before I continued.
> (Also I got busy on other things.)
>
> The county data could probably be thrown in wholesale and fixed after
> the fact, since it's a bit of a smaller scale.  The conversion is
> pretty easy, I use ogr to get GML out of the shapefiles, then a little
> custom python script to turn that GML into OSM XML.
>
> -Ted
>
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