Number

Elevation/m

Measured average /m

Calculated average /m

Relative error

DB-C-P-20

660

130.8028

131.1199

0.24%

DB-C-P-22

660

130.2152

131.1181

0.69%

DB-C-P-30

701

87.4643

90.1198

3.04%

DB-C-P-31

701

87.4967

90.1199

3.00%