Characteristics of the Aperture 4 Hexagon (ISEA4H) DGG
|
Resolution
|
Number of Grid Cells1
|
Hex Area2
(sq. km)
|
Intercell Distance3
(km)
|
CLS4
(km)
|
| 0
| 12
| N/A
| 7,674.460
| N/A
|
| 1
| 42
| 12,751,646.909
| 3,837.230
| 4,046.361
|
| 2
| 162
| 3,187,911.727
| 1,918.615
| 2,016.794
|
| 3
| 642
| 796,977.932
| 959.307
| 1,007.607
|
| 4
| 2,562
| 199,244.483
| 479.654
| 503.705
|
| 5
| 10,242
| 49,811.121
| 239.827
| 251.840
|
| 6
| 40,962
| 12,452.780
| 119.913
| 125.919
|
| 7
| 163,842
| 3,113.195
| 59.957
| 62.959
|
| 8
| 655,362
| 778.299
| 29.978
| 31.480
|
| 9
| 2,621,442
| 194.575
| 14.989
| 15.740
|
| 10
| 10,485,762
| 48.644
| 7.495
| 7.870
|
| 11
| 41,943,042
| 12.161
| 3.747
| 3.935
|
| 12
| 167,772,162
| 3.040
| 1.874
| 1.967
|
| 13
| 671,088,642
| 0.760
| 0.937
| 0.984
|
| 14
| 2,147,483,647
| 0.190
| 0.468
| 0.492
|
Notes:
All measurements assume an earth radius of 6371.0087714 km. (WGS84 mean radius).
1At every resolution 12 of the cells are pentagons
and the remainder are hexagons.
2The 12 pentagons have an area exactly 5/6 the area of a hexagon.
3Measured in the plane of the ISEA projection space.
4Characteristic Length Scale (CLS): the diameter of
a spherical cap of the same area as a hexagon of
the specified resolution. This metric was suggested
by Ralph Kahn.
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