[Geowanking] Election Maps / Population Cartogram

[sophia parafina]

I was playing with this yesterday, so I took the challenge.

I pulled down a shape file of the world's total road network by county
from GeoCommons, extracted Europe in UDig, and ran it through
scapetoad for the total number of roads by country for 2003.  I
plotted the results in UDig and here they are:

http://iaddemo.erdas.com/Map.png

The cartogram in yellow is overlayed on the original shape file in red.

A couple of caveats, there were quite a few 0 values for road mileage
in 2003, so that will skew the results.  I used the default settings
and I did not check the topological integrity of the shape file, which
can influence the results erroneously according to the scapetoad
documentation.

If you want to do travel cost between cities you will need to conflate
you values to a polygon layer of administrative boundaries, since the
algorithm and scapetoad only works on polygons.  So its definitely
most doable.


sophia



On Fri, Nov 7, 2008 at 11:16 AM, Dan Brickley <danbri at danbri.org> wrote:
> neuhausr at bitstream.net wrote:
>> There's a opensource java program ScapeToad that does these sort of
>> transformations on shapefiles.  I've only played with it a little, but
>> it's pretty interesting.  <http://chorogram.choros.ch/scapetoad/>
>
> Could something like this produce a map of Europe distorted to take into
> account ease/cost of travel between cities? (or has anyone else done
> this somehow)
>
> cheers,
>
> Dan
>
> --
> http://danbri.org/
>
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