Ooouppsss, yes for sure it's the Yahoo aerial photographs !!! thanks to point this. Thanks for your other comments too.

Michaël

mmm, I cannot edit back a diary entry. Well, I wanted to complete with the following.
I'm new to openstreet map, so the mapping will not been so well directly, I'm intent to continue mapping on Schifflange (trying, for learning, to use there most of tagging possibilities) and also some place around in direction of Belgium (on the west) and some road on the south (also in France).