Reg: package/approach recommendations, Height estimation of UAV with downward stereo camera

edit

Hello ROS community,

I am working on a project where I have to control a UAV.

I have a stereo camera mounted facing downwards on the UAV.

I wanted to know if there are any packages which can give me UAV height above the ground with the data received by the stereo camera. Or any other way I can get the height of the UAV from the ground. (Working altitude of the UAV - 0 - 2 meters)

After an exhausting search, the only option I had was to post here. Hopefully, someone can give me some info/directions.

Thank you for all for your valuable inputs.