I'm a huge fan of that algorithm (Gastner-Newman, I worked on a stand-alone Java version), but there's something that users should know about it from a data-representation statement: It produces results that may not be accurate for the input data.
The algorithm is an optimization one, and one of the things that it optimizes is getting the areas accurate. So, particular areas or the whole map may diverge from the target values by quite a bit. As I say, I think the algorithm is great, but you need to calculate the areas of the resulting cartograms and compare with the original input to make sure they are within your tolerance for error. regards, -Frank On Thu, Nov 6, 2008 at 1:59 PM, Tom Longson (nym) <[EMAIL PROTECTED]> wrote: > This is the first time I've seen something quite like this, so I > thought I'd share it with the group: > > http://www-personal.umich.edu/~mejn/election/2008/ > > I'd be curious to see this with income / donations data as well. > > nym > > _______________________________________________ > Geowanking mailing list > [email protected] > http://geowanking.org/mailman/listinfo/geowanking_geowanking.org > -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Frank Hardisty [EMAIL PROTECTED] GeoVISTA Center 212 Walker Building Dutton e-Education Institute 434 Earth and Engineering Sciences Building 814-867-1471 http://www.geovista.psu.edu/grants/cdcesda/software/ _______________________________________________ Geowanking mailing list [email protected] http://geowanking.org/mailman/listinfo/geowanking_geowanking.org
