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

[Lester Caine]

Vincent Pottier wrote:
>> Claims are being made that the French data is more up to date, but if it is
>> not being properly geo-referenced and is producing poor quality data should it
>> be allowed in? returning to the example, in the absence of evidence that the
>> building IS split into multiple units it SHOULD be drawn as a single entity?
> What is the "unit" ? Something used for 3D drawing ? Something used for
> statistics ? Something used for a purpose I don't even imagine ?
>> And tidying up would mean aligning it with the bing footprint?
> Sometimes the Cadastre is better than Bing, Sometimes Bing is better...
>
> We have the chance to have put in OSM a network of survey points. It is our best
> reference... but hard to use for newbies...

A lot of work was done making the imagery position accurate and we need 
something as a reference point? DETAILS such as the layout of a church do 
require more information than can be discerned just from the imagery and data 
such as from Cadastre may well contain more detail, but personally I still need 
some better proof that there are problems with the positional detail of the 
imagery? I have not found any problems in the UK when comparing between 
different sources. And the shape of buildings I looked at in France where in 
places very much different to adjacent buildings which matched the imagery :(

( I was trying to use Google to take a walk around the church so I could see the 
buttresses - I have to admit to using it in the UK to remind me of details like 
that which I've not recorded properly, and certainly that level of detail is 
missing on streetview )

-- 
Lester Caine - G8HFL
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