/usr/share/nav_msgs/msg/OccupancyGrid.msg is in libnav-msgs-dev 1.12.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # This represents a 2-D grid map, in which each cell represents the probability of
# occupancy.
Header header
#MetaData for the map
MapMetaData info
# The map data, in row-major order, starting with (0,0). Occupancy
# probabilities are in the range [0,100]. Unknown is -1.
int8[] data
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