[Mapserver-users] finding intersections

Kieran J. Ames kames at keyspanenergy.com
Mon May 19 20:20:37 EDT 2003


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I went through the exercise you mention below, using ArcView Street Maps as
my original source data.
I ended up with a database of street intersections and dead-ends.
(...actually normalized street points that I query to derive intersection
data. The intersection of Main and Broad would be 2 records, each with the
same LAT/LON.) I'm using that to create a point layer that I include in my
mapfile.
The data are in a MySQL database. Data and indices total about 2.9GB. (Almost
28 million point records.)
My app resides behind a corporate firewall, so I can't give you an
interactive interface. But, I've attached a sample image... Some of the
streets that intersect with Folwell Ave in Zipcode 55108 in St. Paul, MN.

The problem is that it was easy (though tedious) to create the data. The
problem is maintaining it and adding new information. I haven't crossed that
bridge yet!

Kieran


pkishor_98 wrote:

> Someone asked me if mapserver could find intersections (constitution
> and 16th). I replied that mapserver by itself can't but there is no
> reason it couldn't be programmed. Then I realized I didn't really know
> how.
>
> I could create a table of intersections for every road (line), but I
> would have to start with a table of roads first.
>
> I could do some finagling with geocoding.
>
> Or I could...
>
> all ideas welcomed. In return, I will take the do-able ones and wiki 'em.
>
> Puneet.
>
> _______________________________________________
> Mapserver-users mailing list
> Mapserver-users at lists.gis.umn.edu
> http://lists.gis.umn.edu/mailman/listinfo/mapserver-users

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--------------BADF2C3774CB53C6962FDB42--




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