[OSM-talk-be] WMS (aerial) imagery covering Belgium, now conveniently packaged for adding it to JOSM

[André Pirard]

On 2014-12-29 17:33, André Pirard wrote :
> I created:
> *SPW(allon) 2012 aerial imagery**
> **SPW(allon) 2009 aerial imagery***
I forgot to add that these photographs may have a perspective effect.
For example, a wall of a house may be visible so that the roof is offset.
In one place I checked thoroughly, 2012 2-floor (1) houses are slanted
1.5 m in one direction and 2009 is slanted the same in the opposite
direction.  That means that the exact position of the house is the
bottom of the wall at ground level and that the roofs are offset by that
value. Of course, the wall and offset are visible only at the end of a
row and the offset must be evaluated all along.
All in all, precise tagging is tricky.
Digitalized maps are corrected, so that a gentle way to use them is to
evaluate the offset of the photo and to continue mapping with that photo.

Cheers

André.


(1) Belgian, not American floors
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