A high-resolution gravimetric quasigeoid model for Vietnam

Earth, Planets and Space

Table 7 Differences between the quasigeoid and GNSS/levelling data according to the order of levelling network [Unit: m]

	Number of points	Mean	STD	Min	Max
ζ^{GNSS/levelling} − ζ^FFT (first and second order)	428	0.508	0.091	0.217	0.781
ζ^{GNSS/levelling} − ζ^LSC (first and second order)	428	0.515	0.087	0.182	0.807
ζ^{GNSS/levelling} − ζ^FFT (third order)	384	0.503	0.104	0.136	0.816
ζ^{GNSS/levelling} − ζ^LSC (third order)	384	0.500	0.108	0.116	0.815
ζ^{GNSS/levelling} − ζ^EIGEN-6C4 (third order)	384	0.488	0.186	− 0.348	0.990
ζ^{GNSS/levelling} − ζ^EGM2008 (third order)	384	0.402	0.274	− 0.512	1.143
ζ^{GNSS/levelling} − ζ^FFT (northern area)	136	0.551	0.082	0.290	0.781
ζ^{GNSS/levelling} − ζ^LSC (northern area)	136	0.540	0.074	0.287	0.707
ζ^{GNSS/levelling} − ζ^FFT (southern area)	120	0.465	0.100	0.224	0.776
ζ^{GNSS/levelling} − ζ^LSC (southern area)	120	0.462	0.092	0.230	0.765
ζ^{GNSS/levelling_coast} − ζ^FFT	69	0.532	0.090	0.333	0.719
ζ^{GNSS/levelling_coast} − ζ^FFT-DTU	69	0.524	0.098	0.322	0.746
Quasigeoid computed with Stokes FFT with grid 2.5′ × 2.5′ over two test areas
ζ^{GNSS/levelling} − ζ^FFT (northern area)	136	0.575	0.073	0.319	0.762
ζ^{GNSS/levelling} − ζ^FFT (southern area)	120	0.446	0.096	0.234	0.829