[OSM-talk] All you've ever wanted to know about the french cadastre

[Frederik Ramm]

Hi,

On 26.09.2012 19:44, Richard Weait wrote:
> I think that "drawing all of the nodes and points manually" is an
> important difference, from a quality point of view.  Each node or way
> that you draw by hand, is carefully considered and placed, one at a
> time.  It isn't perfect; nothing is.  I suggest that this leads to a
> kind of automatic quality control, as the nodes and ways are placed.

To give an example, look at this imported building

http://www.remote.org/frederik/tmp/funnybuilding.png

Note how the main building consists of 8 separate parts plus a strange 
diagonal line, and note how the smallest parts are just about 2 metres wide.

Compare to the aerial image:

http://binged.it/UuYSio

A very careful tracer of the aerial image might indeed have created more 
than just one shape for this, but there is hardly anything there on the 
imagery that suggests *such* a complex edifice.

This is not an example that you only find after a long search; it is a 
typical cadastre import building.

Bye
Frederik