On 2018-09-21 23:22, Martin Koppenhoefer wrote:
sent from a phone
On 21. Sep 2018, at 21:32, André Pirard <a.pirard.pa...@gmail.com
<mailto:a.pirard.pa...@gmail.com>> wrote:
The whole cadastral map is offset by that 7m.
...
*Picture 3:* So, I dragged his parcel right onto the wall.
And now it's correctly located, aligned with the fencing all around.
how did you know which source was off, the cadastral map or the
orthophoto?
The ortophoto is guaranteed with a 20 cm precision all over Wallonia.
On the other hand, all aerial photos cannot be off by the same 7m could
they?
On the first foot, juxtaposing precisely measured parcels produces huge
errors that vary all over a village.
I just can't figure.
I did not check if this occurs at gaps when crossing roads or what.
I'm not working for the Cadastre. I pay them ;-)
In Beijing, it was Google Maps that moved.
Satellites (several if I recall) were showing OSM in the right place.
All the best,
André.
...
The Belgian cadastre is not the only one with an error shift.
With JOSM, I have similarly proved that Google Map has a 120m NE
shift in Beijing.
Nobody noticed it.
it is well known that the chinese government requires all imagery and
map providers to use chinese algorithms which distort the map
coordinates systematically, in a way that they remain usable as long
as your navigation system uses the same algorithms.
Ciao, Martin
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