AR drone surface detection [closed]

asked 2012-07-13 22:49:23 -0500

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I need to detect the change in surface height below the AR Drone??

So initially I thought the altitude parameter in navdata msg will suffice but once drone is flying its altitude does not change with change in height of surface below the robot so is there any way to access actual sonar reading??

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Closed for the following reason question is not relevant or outdated by tfoote
close date 2015-03-26 18:23:58.847623