Research and Construction of a Global Hexagonal Marine Gravity Gradient Reference Map for Navigation

Table 5

Grid model error statistics, where Std indicates the standard deviation.

Track	Grid	Resolution	Track grid number	Maximum (km)	Minimum (km)	Average (km)	Std (km)
1	Hexagon	11th level	305	2.1375	0.0046	0.9955	0.5725
	Quadrilateral	2	361	2.5376	0.0131	1.2442	0.7167
	Hexagon	12th level	606	1.0944	0.0015	0.4964	0.2845
	Quadrilateral	1	721	1.2668	0.0030	0.6205	0.3584
	Hexagon	13th level	1202	0.5530	0.0010	0.2456	0.1420
	Quadrilateral	30	1435	0.6314	0.0012	0.3086	0.1787
2	Hexagon	11th level	314	2.1532	0.0174	1.0555	0.6103
	Quadrilateral	2	348	2.5376	0.0052	1.2274	0.7117
	Hexagon	12th level	625	1.1001	0.0015	0.5233	0.3042
	Quadrilateral	1	695	1.2668	0.0036	0.6123	0.3573
	Hexagon	13th level	1255	0.5530	0.0011	0.2638	0.1524
	Quadrilateral	30	1390	0.6314	0.0021	0.3068	0.1778