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Hi,

Please have a look into yaml of map you are using.

using origin and resolution you can find position of each cell.


origin : The 2-D pose of the lower-left pixel in the map, as (x, y, yaw), with yaw as counterclockwise rotation (yaw=0 means no rotation). Many parts of the system currently ignore yaw.


resolution : Resolution of the map, meters / pixel

Hi,

Please have a look into yaml of map you are using.

using origin and resolution you can find position of each cell.


origin : The 2-D pose of the lower-left pixel in the map, as (x, y, yaw), with yaw as counterclockwise rotation (yaw=0 means no rotation). Many parts of the system currently ignore yaw.


resolution : Resolution of the map, meters / pixel


Edit

Occupancy Grid msg member data is having

Occupancy probabilities are in the range [0,100]. Unknown is -1.

Use free_thresh param to get Unoccupied cells (i.e free cells).

free_thresh : Pixels with occupancy probability less than this threshold are considered completely free.

if free_thresh: 0.196 then all cells with occupancy lessthan 19.6 (and not -1 ) are free .