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

From: A high-resolution gravimetric quasigeoid model for Vietnam

  Number of points Mean STD Min Max
ζGNSS/levelling − ζFFT (first and second order) 428 0.508 0.091 0.217 0.781
ζGNSS/levelling − ζLSC (first and second order) 428 0.515 0.087 0.182 0.807
ζGNSS/levelling − ζFFT (third order) 384 0.503 0.104 0.136 0.816
ζGNSS/levelling − ζLSC (third order) 384 0.500 0.108 0.116 0.815
ζGNSS/levelling − ζEIGEN-6C4 (third order) 384 0.488 0.186 − 0.348 0.990
ζGNSS/levelling − ζEGM2008 (third order) 384 0.402 0.274 − 0.512 1.143
ζGNSS/levelling − ζFFT (northern area) 136 0.551 0.082 0.290 0.781
ζGNSS/levelling − ζLSC (northern area) 136 0.540 0.074 0.287 0.707
ζGNSS/levelling − ζFFT (southern area) 120 0.465 0.100 0.224 0.776
ζGNSS/levelling − ζLSC (southern area) 120 0.462 0.092 0.230 0.765
ζGNSS/levelling_coast − ζFFT 69 0.532 0.090 0.333 0.719
ζGNSS/levelling_coast − ζFFT-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
 ζGNSS/levelling − ζFFT (northern area) 136 0.575 0.073 0.319 0.762
 ζGNSS/levelling − ζFFT (southern area) 120 0.446 0.096 0.234 0.829