gps surveyor total station measuring coordinates question

Gps is short for Undirected Global System, don't add instrument!

In general, you ask more questions about the two major aspects of measurement, total station measurement and GPS measurement, it is recommended that you read surveying, control surveying and GPS control network measurement, I can only briefly describe it here!

The principle of surveying and mapping is from the known to the unknown, from the high level to the low level, from the whole to the local! So no matter the total station mapping and GPS surveys have to need to control points all the time!

Nowadays the total station have coordinate measurement function, as long as you correctly set up the survey site, rear view point and inspection point, the unknown points are measured coordinate value.

As a traditional measurement method, it is required that the known and unknown points must be in clear view of each other, so there can be no obstacles between the total station and the prism!

You now coordinate base point and site difference of a few kilometers, even dozens of kilometers can be achieved with a total station, but if you hit the wire strike la, and do the wire is a small control, this small control regardless of the wire or GPS, how to save how to come to the method of the equipment does not have a fixed requirement! I see your statement is very unprofessional, the foundation is too poor, you are not understood to be directly from the base point of the site, in fact, as long as the pass-through vision is not, so far, unstable imaging conditions inside the total station is like a moving, precision is not guaranteed, simply can not be used!