On Mar 19, 11:11 pm, Spodgy <[email protected]> wrote:
> Hi There,
>
> Apologies if this subject is covered in the general FAQs.
>
> I've just starting using the Google Maps V3 API. I'd like to write a
> page that centres in the middle of a scenic driving route, and
> highlights the roads (typically these will be circular style routes).
>
> I could work out the geometry manually, and draw lines over the map,
> but this could be time consuming, and the end result probably wouldn't
> look very professional!
>
> What I'd like to do would be to identify roads individual, and
> highlight them between two given geo points, completing the circle by
> feeding in the points of the sections of the roads involved.
>
> Can I harness the roads as an object model? If not, are there suitably
> artistic alternatives? :)
>
> Thanks
> Jim
If you are in the US, you can obtain shapefiles from the Bureau of
Transportation Statistics:
http://www.bts.gov/publications/national_transportation_atlas_database/2009/
The BTS shapefiles are derrived from the US Census Department's Tiger
Line database but are much more user friendly. The Tiger Line files
are much larger & lack some of the useful auxilliary information
provided by BTS.
I have a couple of demos based on BTS shapefiles.
See:
http://www.polyarc.us
Specifically "Lake Michigan Shore" & "Pacific Coast Highway".
Also, "US Highways" is an unrealistic "torture test" to determine how
many polys cause a browser to crash.
I have never had much luck with the direction finder service. It is
difficult to force it follow a particular route without adding a lot
of waypoints. The practical limit on waypoints is approximately ten
even though the documentation claims 25. It is due to a very verbose
GET URL which exceeds the length limit in some browsers.
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