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network.
2) The points of the GPS network should coincide as close as possible
with that of the original ground control network. Coincidence point
generally should not be less than three (should perform levelling
conjunction when not enough) and should be evenly distributed in
the network in order to reliably determine the transformation
parameters between the GPS and Ground Networks.
3) The points of the GPS network coinciding with the leveling points
should be considered. Non-coincidence point should generally
perform levelling conjunction method (or methods of equivalent
accuracy), or set a certain density levelling conjunction point in the
network, to provide information for the study of the geoid.
4) In order to facilitate the observation and perform levelling
conjunction, GPS outlets should generally be located in unobscured
and easy -to -reach places.
5) In order to facilitate the classical levelling conjunction or extension,
emplace near the outlet a good view orientation point, to establish
levelling conjunction direction. The distance between the point and
the station should generally be greater than 300 meters.
6) According to the different purpose of GPS measurements, the