OpenStreetMap

j3d's diary

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S3DB in PL/PGSQL with PostGIS featuring SFCGAL

Posted by j3d on 28 October 2013 in English (English)

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.

NY Bremen

More about new PostGIS 3D features http://vimeo.com/74869530

Yet another WebGL map (demo)

Posted by j3d on 10 August 2013 in English (English)

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

vtm - tube theme

Code is on Github. Note: tiles below zoom 12 are currently reworked.

[1] http://www.opensciencemap.org/

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