Leica GPS1200+ Technical Reference Manual page 545

Diagram
Config...\Interfaces... - General
d2
d1
a
d5
P0
GPS12_058
P0 Known point
P1 Target point
P1
P2 Hidden point
a
d3 d4
b
b
d1
d2
P2
d3
d4
d5
GPS1200+
Height of P0
Height of P2 = a + d1 + d4 - d3
Device height: height of hidden point meas-
urement device above P0
Slope distance
Device height: height of P1 above P2
Height difference between hidden point
measurement device and P1
Horizontal distance
545