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Terrain Grid and Cell Sizes

Terrain grid and cell sizes explained by Snake Man, PMC.

If you do not know how large your terrain is, or someone is reporting on the forums that he made this and that sized terrain, here is the table to once and for all explain to you how big (or small) is a terrain of certain specification.

Grid size is the important factor as OFP/ArmA (and so far that we've heard ArmA 2 also) engines only handle power of two grid sizes.

Grid size	Cell size	km x km
4096	50	204.8
4096	40	163.8
4096	30	122.8
4096	20	81.9
4096	10	40.9
4096	8	32.7
4096	6	24.5
4096	4	16.3

Grid size	Cell size	km x km
2048	50	102.4
2048	40	81.9
2048	30	61.4
2048	20	40.9
2048	10	20.4
2048	8	16.3
2048	6	12.2
2048	4	8.1

Grid size	Cell size	km x km
1024	50	51.2
1024	40	40.9
1024	30	30.7
1024	20	20.4
1024	10	10.2
1024	8	8.1
1024	6	6.1
1024	4	4

Grid size	Cell size	km x km
512	50	25.6
512	40	20.4
512	30	15.3
512	20	10.2
512	10	5.1
512	8	4
512	6	3
512	4	2

Grid size	Cell size	km x km
256	50	12.8
256	40	10.2
256	30	7.6
256	20	5.1
256	10	2.5
256	8	2
256	6	1.5
256	4	1

And so far I've never seen anybody do smaller than 256 grid size terrains, but maybe at this point you can already calculate yourself how small those terrains would be.

All BIS made terrains were as follows:

Name	Grid size	Cell size	km x km
OFP islands	256	50	12.8
ArmA Sahrani	2048	?	?
ArmA Rahmadi	1024	?	?