WernerD
Second Officer
Flight distance : 350837 ft
Austria
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The I1 does have an ultrasonic distance sensor to measure height above ground and display its reading in the DJO Go App, just like P4 and Mavic. When you try to fly below 0.5m above ground, there is a "resistance". You have to really hold against its tendency to increase height. And when you put height stick in neutral, it will slowly raise to a safe height of 1m or so. I think that is exactly what you are looking for, isn't it?
If the bird is not moving and you reduce the height, it assumes you want to land.
Btw, the downward facing optical(!) sensors as you asked are the Visual Positioning System. These are good for landing, hovering and in-door flying but produce no height information. They try to see if you are floating over ground and compensate that, holding the bird at the exact same position, more precise than GPS can (if there is GPS indoors).
Hitting the ground usually happens when you fly an uneven terrain at higher speeds. Then you might fly into a bump or an obstacle. As the ultrasonic sensor points directly downwards in relationship to the drone, this does not prevent that from happening. For that you need the forward optical sensors.
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