Question: How to predict the tree is about to fall?

Answer: to predict the tree is about to fall just simply install a tilt sensor on the trunk of tree. The sensor will measure the 03 angles of XYZ. There are 03 kinds of Tilt sensor as below:

• LoRaWAN Tilt sensor: https://www.daviteq.com/en/?prd=_WSLRW-AG_lorawan-tilt-sensor
• Sigfox Tilt sensor: https://www.daviteq.com/en/?prd=_WSSFC-AG_sigfox-tilt-sensor 
• Sub-GHz Wireless Tilt sensor: https://www.daviteq.com/en/?prd=_WS433-AG_wireless-3-axis-tilt-sensor