OpenStreetMap
hmmm ST_StraightSkeleton() … what to do with it? :)
http://opensciencemap.org/~jeff/test/#scale=17,rot=326,tilt=57,lat=48.855,lon=2.312
I should mention that the large building complex ‘Hôtel des Invalides’ is only one multipolygon tagged with roof:shape=hipped and CGAL takes 15 seconds to compute the skeleton for it.
More about new PostGIS 3D features http://vimeo.com/74869530
A short wrap up as this is my first diary entry: I’ve learned about OSM through a job at university where we started to develop a vector-tile service and an android map-viewer about two years ago[1]. Since then I’ve worked on the OpenGL map renderer (based on mapsforge), a vector tile format for efficient rendering (implemented as TileStache provider) and simplification of OSM data for lower zoom-levels, besides other things. Probably the biggest struggle was trying to make sense of the OSM tags and define rules how to render them properly :)
In my spare time I started abstracting the android specific code from VectorTileMap library through interfaces and use libgdx as a backend. Libgdx is a multi-platform game library which itself provides different backends. Its html-backend uses GWT to compile java code to javascript which turned out to work pretty nicely.
Ok, without further ado, this was all way too technical I guess, enjoy the demo :)
World | [Bremen] (http://city.informatik.uni-bremen.de/map/#scale=17,rot=266,tilt=41,lat=53.074,lon=8.806)
Code is on Github. Note: tiles below zoom 12 are currently reworked.