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

[THEVENON Julien]

>>>> De : Lester Caine <lester at lsces.co.uk>

>>>> Many of the buildings moving away from the one identified simply do not even fit the footprint on the bing imagery ?
What make you so sure that the thruth is in imagery and not in cadastre ? particulary considering that Bing is often several year late and that offical french maps (IGN) are also relying on cadastre for building ?
There are a lot of examples of places where there are some buiding referenced in cadastre that do not appear in Bing but that you can see IRL.
You will decide to remove them because you they are not on Bing or you will trust local contributors that introduce them because they know they are real ?

how do you make the difference between the guy that has the knowledge and the one that has not ?


>>>> Now that I have scanned some of the French 
material I must say that it is of very low quality and all of the stuff I have reviewed needs at least SOME work to bring it up to a better 
standard.
>>>> At best all one can say currently is 'there are some buildings round about here' ... and stripping unsubstantiated detail would at 
least be a start.
According to the way you say that I assume that you have directly check in IRL or perform a comparison with a better quality and reliable source to decide that the wole cadastre is of very low quality...
Could you share with us you criteria and methodology to be so affirmative and allow us to determine which details are unsubstantiated ?
After all we are just mappers that concentrate on part of world  where we are living and that we know, if I remember well this is the base of Openstreetmap crowdsourcing ?

Cheers
Julien
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