I'm a Topographical Surveyor
An *.SDR it's raw data from Sokkia it is a Sokkia Data Record file.
It must be calculated in a topographical software or other
Each point normally has a code related, the label must be code
It could be transformed in a ASCII file (*.txt file) with the configuration
POINT ID,COORDINATES (X,Y,Z), and CODE
Nuno Moura Pereira