Lidar and mission height

Hello

I have to execute a mission above a forest but I'm not sure the right value to assign  to the height of the mission. Should I consider the max trees height (30m for example) and add a security height (10m for example) to be safe. 

I have a Lidar mini from benewake whinch has a 7m outside range installed under the model facing down.

I'm afraid of the possibility that if there is a "clear" area in the forest, the model will go down since it doesn't detect a tree. Will it trust the barometer data to maintain the 40m or will it goes down ?

Thanks

Franck

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