I don't have any solid solutions, but it's a problem I've run into as well in many uses. How do you simply visualize tribal or ethnic affiliation areas with within a city where the populations overlap? How about comparing multiple areal demographics data - most recently comparing poverty rates with access to clean toilets [1]
One potential solution are to use non-contiguous surfaces, such as dot-density maps. This seems to work well for Eric Fischers maps of Flickr populations [2]. The New York Times used it as well in the mix-received census demographic maps [3,4]. [1] http://www.sanitationhackathon.org/ [2] http://projects.nytimes.com/census/2010/explorer?ref=us [3] http://www.flickr.com/photos/walkingsf/sets/72157624209158632/ [4] http://www.flickr.com/photos/walkingsf/sets/72157624812674967/ I'm also curious what others have seen or tried. Andrew On Thu, Nov 8, 2012 at 1:21 PM, Andy Allan <[email protected]> wrote: > Hi All, > > I've been working for a while on a system[1] that lets people log > "issues" or "problem reports" geographically. A reporter can log the > issue as having a point, line or polygon geometry. > > The problem that I'm facing is how to best show a map of issues for a > given region, e.g. a town. They come in all shapes and sizes, often > overlapping, and that causes an unintelligible mess[2]. > > Any geowankers know of any sites that show multiple overlapping > features in a useful fashion? Any guides to how to approach the > problem? > > So far we've put in place to order by size (biggest at the back, of > course), make fills translucent (but it still sucks if too many > overlap), ignore polygons that entirely encompass the bbox - all > certainly worth doing, but it's a long way from something to be proud > of. > > Cheers, > Andy > > [1] https://github.com/cyclestreets/toolkit > [2] e.g. http://i.imgur.com/GafGb.png and http://i.imgur.com/Tl877.png > > _______________________________________________ > Geowanking mailing list > [email protected] > http://geowanking.org/mailman/listinfo/geowanking_geowanking.org > -- Andrew Turner t: @ajturner b: http://highearthorbit.com m: 248.982.3609
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