On Thu, 26 Feb 2009 18:19:53 -0500 (EST), si...@mungewell.org wrote: >> Can anyone give me any tips on how to take a simple table of data with a >> figure >> for each coordinate, and turn it into a heat map? At first I thought of >> GeoCommons but it seems you can only use pre-processed data with their >> Maker >> tool. > > It sounds like you don't want to do any pre-processing... if you change > your mind you could: > > 1). Create a coloured overlay and place that as a translucent layer. > http://openlayers.org/dev/examples/layer-opacity.html > > This could be a single image file, or another tile server (as per example). > > 2). Create a set of vector shapes (contours?) and overlay those using an > OSM or other layer (could be heavy on browser if a larger area). > > The Srtm2Osm scripts already make the contours so these can probably be > abused. > > > Other hint: applications like Gnuplot and matlab can take single point > data and export a x-by-y table of data. In gnuplot use the 'set term > table' command a replot your graph
Thanks for the tips. Maybe one day I'll look into all of that but what I'm really hoping for is something like this: http://www.heatmapapi.com/ But that allows me to use OpenLayers. I've got a simple example of the heat map bit with OSM tiles here: http://www.bioregional.com/heatmap.html We have a table of businesses with lonlat and a CO2 emissions quantity, I want to overlay coloured markers for each point and a heatmap layer to give the overall impression (as with that Google-based API). I also want to be able to produce high quality images for a printed report, i.e. not just screenshots of a Google map if possible. My problem is that I haven't got time to work out (in my technically deficient way) how to turn a 2 column table into something that I can put through gnuplot or srtm2osm and eventually get into an OpenLayers overlay. So at the moment I'll probably have to opt for the google API. Regards, Tom _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
