Hi Armen
The map you give a link to does not appear to have broken copyright in
its making, but I think you are correct to say it was not made using a
GPS receiver.
Creating tracks using a gps then converting those tracks into roads is
not the only way to map in OSM.
Many organisations are making their mapping data available to OSM,
some people have access to out-of-copyright maps, some people have
access to professional grade GPS kit, all of which can lead to very
accurate maps.
Also, Yahoo has made their "satellite" imagery available to OSM for
mapping purposes, amd I am very confident this is how the area you
link to has been mapped. If you click on the Edit Tab on the page you
link to (after creating an account) you will be able to edit the map
using the Yahoo Satellite Imagery. Its very clear this area has good
imagery available and has been traced over.
Yahoo's "satellite" imagery is very bad compared to Google's. Its a
real shame that while many companies across our planet our going out
of their way to make available mapping data for the OSM project,
Google cant/wont give access to their satellite imagery. OSM is
providing a people across our planet with a source of mapping "with an
open content license which is designed to make the data free and easy
to re-use".
I can understand the reasons for contributing to Google Map Maker, you
the user, gets free access to better maps of your area. OSM will take
a long time to catch up with google maps and probably will never have
access to high quality satellite imagery. (And on google you dont have
to worry about footpaths being labelled cylclepaths by the cyclists
that seem to dominate OSM!), But if I am going to give up a bit of
time to help create a map of my area, I'm going to do it for a project
that intends to make ALL the underlying data available for free and
easy to re-use, and wont sell my work for a profit!
Since you know the area in the map you linked to, maybe you could
create an account on OSM and improve it using the Satellite Imagery?
Cheers
Jason