The surveying instrument contains a component part (1) for the optical imaging of a target and a camera (2) for the electronic acquisition of the image produced in the optical instrument part. A reference mark (20) is located in the optical part (1) of the instrument, and this is outside that region...http://www.google.es/patents/US4907882?utm_source=gb-gplus-sharePatente US4907882 - Surveying instrument for automatically taking measurements
Surveying instrument for automatically taking measurements
