a JavaScript library for thematic mapping in OpenLayers
At last October’s NACIS Practical Cartography Day I gave a very sweaty presentation that was later described as bewildering and incoherent. I had always meant to partially redeem myself by packaging and cleaning up the code that formed the basis of that talk. And here it is!
OL-Symbology is [...]
Also tagged cartogram, choropleth, classification, code, dot density, geojson, javascript, library, NACIS, noncontiguous cartogram, openlayers, projections, proportional symbol, symbology, thematic mapping
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A week or so back I wrote about a package I ported/modified to create the Delaunay triangulation in Flash with a few AS3 classes. As I noted there, such a triangulated irregular network (TIN) allows us to interpolate isolines — lines of constant value (aka isarithms, commonly called contours).
So, given a field of points [...]