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Archive for March, 2011

Using ABS ASGS Data in OpenStreetMap

March 17, 2011 3 comments

A little while ago Marcus Blake from the Australian Bureau of Statistics asked the OSM community about the potential use of some ABS data. As I mentioned on the list I think it is good that at least some government departments are making their data available under free licenses and that they engage with with the community to sort out any technical details about the data.

As described by the ABS, the ASGS is essentially data describing geographical areas.

ASGS ABS Structures - CC-BY 2.5 AU Australian Bureau of Statistics

ASGS Non-ABS Structures - CC-BY 2.5 AU Australian Bureau of Statistics

Working out which if any structures should be incorporated into OSM and how needs careful consideration, and I’ve posted some of my thoughts to the list. In the mean time, since the data does contain some landuse information I’ve been looking into how best to use this information to aid in mapping. A blind import is not an option in my opinion, but I thought it would be handy to see the data as a base map when mapping.

I did try using ogr2osm to convert the data to the OSM xml format to load into JOSM (I even got the translateAttributes function for ogr2osm working for this dataset), but due to the nature of the data, I think a simple raster underlay works well. I tried two approaches in parallel.

  1. shp -> osm (using ogr2osm) -> postgres (using osm2pgsql) -> raster tiles (using mapnik).
  2. Using GeoServer to serve a WMS which can be loaded into JOSM.

Option 2 seemed to require less set up time. Simply used the GUI to load the shapefile, and apply a style. Then load the WMS into JOSM.

ABS Mech Blocks with landuse styling in JOSM, with NearMap underlay.

ABS Mech Blocks with landuse styling in JOSM, with NearMap underlay.

One caveat, if you want to load a WMS services from GeoServer into JOSM, I found the URL should look something like:

http://localhost:8080/geoserver/wms?service=WMS&version=1.1.0&request=GetMap&layers=workspace_name:layer_name&styles=&format=image/png&

Slightly unrelated but if you are using tomcat or jetty locally but only occasionally (like I do), I find it is best to use sysv-rc-conf (eg. sudo sysv-rc-conf tomcat6 off) to disable the tomcat or jetty daemon from running at boot, whilst still allowing you to start it (sudo service tomcat6 start) when you need it.

If anyone is interested in getting such data in JOSM and would like more details, just let me know.

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I’ve switched to nouveau, an open source nvidia driver

March 7, 2011 1 comment

…and I’m back. I’ve finally upgraded from the nvidia proprietary driver, to the open source nouveau driver. After a little bit of time stuck at the console (I somehow managed to break X) trying to remember how to do things without a graphical display, I’ve got things working normal again.

First impression is compiz seems to be much slicker (ie. animations are smoother) on nouveau rather than the nvidia proprietary driver. I like it.

I had a couple of hiccups in the switch. I needed to clean /etc/X11/xorg.conf down to the 4 line minimal version to get a sane display resolution, and I needed to properly remove the nvidia proprietary driver (apt-get remove worked, but I needed to remove all the non-free nvidia packages). I also needed to install libgl1-mesa-dri-experimental to get direct rendering for compiz and basic OpenGL programs to work. Compiz seems to run fine now. The only noticeable difference in SuperTuxKart is a white flicker…

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