Page 1 of 5
K. Reduction Example: SPC
1. Preliminary Calculations
a. Survey Data
This chapter covers measurements reduction for an SPC conic zone. Distances and coordinates will be in survey feet.
The survey data and SPC grid information for point Jerry are summarized in Figure K1 and Table K1.
Figure K1 Survey Data 
Table K1
Orthometric Heights


Point 
H, ft 
Jerry 
1177 
A1 
1805 
B7 
1340 
b. Approximate Coordinates
Compute approximate SPC coordinates of A1 and B7.
Point A1
Point B7