On Thursday 26 June 2008, Edward Johnson wrote: > * Another hypothesis is that more complete areas of OSM will have a > higher level of edit activity. If no-one has ever edited an area then it > may be unlikely that the map is complete there, obviously however there may > just be nothing there, so this test could be used in conjunction with the > Yahoo! Imagery test stated before. If we could produce some sort of heat > map showing which areas are edited most frequently and monitor it over time > this could certainly show us some interesting trends.
I have done approximately this some time ago. See my post in an earlier thread on completeness measures: http://lists.openstreetmap.org/pipermail/talk/2008-May/026284.html In the meantime I created the images for the Netherlands weekly and put them in an animated GIF file: http://www.vanwal.nl/osm/density/nl_500_080425-080619.gif On the Dutch tile server we also added a layer showing recent changes, overlayed over aerial imagery, see http://tile.openstreetmap.nl/~rubke/fietskaart/?zoom=9&lat=52.00&lon=5.07&layers=0B000FFFFFFFFFFTT (Only zoom level 7-10; the placenames can be turned off in the layer menu.) Although the amount of recent changes is not a measure for completeness, I think it shows nicely what we can do using automated image generation, and the method can easily be adapted to show different kinds of statistics. -- Freek _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
