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

Table 4

Correspondence between the ISEA4H hexagonal grids and the quadrilateral grids.

Grid	Resolution (level)	Distance between adjacent grid midpoint (km)	Average area of grid (km^2)	Number of grids in the test area
Hexagon	11th level	3.767	12.161	92,767
	12th level	1.884	3.040	371,059
	13th level	0.942	0.760	1,484,237
Quadrilateral	2	3.711	13.771	90,000
	1	1.855	3.441	360,000
	30	0.927	0.859	1,440,000