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

Table 2

Parameter statistics of the H3 grid (with a spherical radius of ).

Level	Number of grid	Area of grid (km^2)	Average side length (km)
0	122	4,250,546.8477000	1,107.712591000
1	842	607,220.9782429	418.676005500
2	5,882	86,745.8540347	158.244655800
3	41,162	12,392.2648621	59.810857940
4	288,122	1,770.3235517	22.606379400
5	2,016,842	252.9033645	8.544408276
6	14,117,882	36.1290521	3.229482772
7	98,825,162	5.1612932	1.220629759
8	691,776,122	0.7373276	0.461354684
9	4,842,432,842	0.1053325	0.174375668
10	33,897,029,882	0.0150475	0.065907807
11	237,279,209,162	0.0021496	0.024910561
12	1,660,954,464,122	0.0003071	0.009415526
13	11,626,681,248,842	0.0000439	0.003559893
14	81,386,768,741,882	0.0000063	0.001348575
15	569,707,381,193,162	0.0000009	0.000509713

Note: the information in this table is taken from the Internet (https://h3geo.org/).