Reference point

2015

(m)

2017

(m)

GPS ΔE

(m)

Map

∆E (m)

DFM-004

1962.670

1962.985

0.315

0.02

DFM-001

2154.150

2153.998

−0.152

−0.009

H

1992.735

1992.484

−0.251

−0.009

S

2171.856

2171.964

0.108

−0.009