[Talk-at] kittsee - semiautomated import of buildings from basemap.at

Friedrich Volkmann bsd at volki.at
Thu Dec 26 17:18:07 UTC 2013

On 26.12.2013 17:09, Frederik Ramm wrote:
> * source tag on every building (source tag on changeset would be enough)

Indeed. If a building has source=basemap.at (or bing etc.) and then someone 
adds other tags, the source tag is incorrect for these other tags.

If source tags are needed on a feature for some reason, better use 
source:geometry or similar.

> * very small buildings seem to be badly traced (triangular shapes etc)
> - - perhaps just drop everything below 10 square metres or so.
> There seem to be a number of mismatches between the data and Bing
> imagery - but I guess that's because basemap.at is newer? Examples:
> http://www.remote.org/frederik/tmp/kittsee.png

No, basemap.at is older. It's probably the collection of the oldest data we 
have ever seen. It seems that the street names originated from the same data 
source as of plan.at. A good test for this is Severusgasse in Hainburg. 
There is a road that never ever existed in the real world. All of these data 
collections inherited that bogus road.

Shape and placement of buildings is also quite poor on basemap.at. It is 
obvious that an import for only one village requires more overall work than 
just drawing the buildings manually using geoimage.at.

But, of course, this can be considered as a test run, with the intention to 
import buildings for other villages too, or even for all buildings in 
Austria... This would get us quickly a lot of data, with quantity 
compensating for quality, like plan.at import.

Friedrich K. Volkmann       http://www.volki.at/
Adr.: Davidgasse 76-80/14/10, 1100 Wien, Austria

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