Gravimetric geoid modeling from the combination of satellite gravity model, terrestrial and airborne gravity data: a case study in the mountainous area, Colorado

Earth, Planets and Space

Table 8 Statistics of the differences between the gravimetric geoid models based on different data combination modes and the GPS leveling measured geoid heights (unit: m)

Terrestrial gravity point spacing and number		Elevation of GPS leveling benchmark (m)	Group B:GOCO06S + Terrestrial		Group A:GOCO06S + Terrestrial + airborne		Accuracy improvement
Terrestrial gravity point spacing and number		Elevation of GPS leveling benchmark (m)	Mean	SD	Mean	SD	Accuracy improvement
OS	59,303	> 2000	0.868	0.064	0.865	0.060	6.3%
OS	59,303	< 2000	0.855	0.052	0.856	0.047	9.6%
5 km	13,063	> 2000	0.869	0.067	0.870	0.059	11.9%
5 km	13,063	< 2000	0.861	0.053	0.857	0.047	11.3%
10 km	4600	> 2000	0.860	0.067	0.862	0.061	9%
10 km	4600	< 2000	0.857	0.054	0.854	0.047	12.3%
15 km	2212	> 2000	0.864	0.078	0.863	0.072	7.7%
15 km	2212	< 2000	0.857	0.053	0.852	0.048	9.4%
20 km	1248	> 2000	0.857	0.082	0.860	0.070	14.6%
20 km	1248	< 2000	0.853	0.055	0.851	0.048	12.7%
25 km	824	> 2000	0.872	0.082	0.864	0.071	13.4%
25 km	824	< 2000	0.852	0.062	0.847	0.049	21%
30 km	569	> 2000	0.840	0.086	0.853	0.069	19.8%
30 km	569	< 2000	0.848	0.065	0.845	0.052	20%
35 km	416	> 2000	0.857	0.101	0.856	0.085	15.8%
35 km	416	< 2000	0.843	0.062	0.844	0.050	19.4%
40 km	322	> 2000	0.859	0.086	0.860	0.069	19.8%
40 km	322	< 2000	0.856	0.064	0.853	0.051	20.3%