The Map display shows a nav_msgs/OccupancyGrid message. The occupancy grid is treated the way the navigation stack treats it. A value of 100 is black (occupied), a value of 0 is white (unoccupied), and anything else is gray (unknown).
Properties  | 
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Name  | 
  Description  | 
  Valid Values  | 
  Default  | 
Topic  | 
  The topic to subscribe to  | 
  Any valid Graph Resource Name  | 
  Empty String  | 
Alpha  | 
  The amount of transparency to apply to the map  | 
  [0-1]  | 
  1  | 
Request Frequency  | 
  How often to re-request the map, in seconds. A value of 0 means to never re-request the map.  | 
  0+  | 
  0  |