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 |