[Talk-ca] uStream.tv - GeoBase Import to OpenStreetMap

[Steve Singer]

On Wed, 4 Feb 2009, Moreau, Jean-Sébastien wrote:

> Hi all,
>
> I did some test with the roadmatcher and wanted to give you some feedback. 
> Although the tool has advanced features for the conflation of roads 
> networks, the automatic matching function doesn't behave as expected when 
> the two datasets have significant differences in terms of segmentation 
> rules. As some of you might have realised, the geobase network has a lo

When I work with the data in wgs84 I tend to use5D
min segment: 5.0E-7
Standalone distance: 5.0E-4
Match distance: 5.0E-4

Or if I reproject to meters I tend to have a min segment length of 1 m, and 
use valuse between 10-100 meters for the other values depending on how built 
on the area is and the quality of the OSM data.

So far I have only been using road matcher to detect standalone roads and 
only import the standalones.  This does means some roads though





> more junction than the osm network. The roadmatcher tool seems to have 
> trouble to find the different pieces of geobase segment that correspond to 
> an OSM element. Fixing the resulting layer was a tedious task.
>
> It might be possible though to tweak on the different tolerance values in order to improve the result.
>
>
>
> Have some of you got good result with this tool? If so, what values did you use for the tolerances?
>
>
>
> Right now, I'm working on a simpler solution using fme.
>
>
>
> Jean-Sebastien Moreau
>