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It is mapping in between real size and pixelated size.

Resolution parameter used to define your mapped area virtually. suppose you has room of size 10m x 10m and you have mapped that room with your robot. so now you have occupancy grid of that room and want to use it in simulation.

Suppose your Occupancy grid image size is 1000 pixel by 1000 pixel.

now to adjust your pixelated occupancy grid to original size, your resolution should be 10/1000 = 0.01

In conclusion, resolution = Real size / pixelated size

It is mapping in between real size and pixelated size.

Resolution parameter used to define your mapped area virtually. suppose you has room of size 10m x 10m and you have mapped that room with your robot. so now you have occupancy grid of that room and want to use it in simulation.

Suppose your Occupancy grid image size is 1000 pixel by 1000 pixel.

now to adjust your pixelated occupancy grid to original size, your resolution should be 10/1000 = 0.01

In conclusion, resolution = Real size size(in meters) / pixelated size