[OSM-talk] Affordable 1 CM high precision GPS.

[Martin Koppenhoefer]

 I am used to different procedures, towards the beginning of a construction
operation, a publicly appointed surveyor (Öffentlich bestellter
Vermessungsingenieur) defines a local coordinate system and marks it on the
ground (e.g. marks building outlines, site limits etc.), as well as relates
it to the global system (boundary marks, coordinates) (signs a plan with
these marks and coordinates). Construction takes place with respect to this
locally marked reference system, if marks get lost, she has to come back
and reestablish them.
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