| Summary: | Many private companies owned by individuals, the Indonesian state-owned enterprises or by foreign parties have been operating on coal mining in Indonesia. With so many coal mining companies in Indonesia, it is necessary to regulate the rules for the closure of ex-mining land. If it is not regulated, the process of closing the ex-mining land can have an impact on the destruction of the forest or natural ecological system. The government has issued several regulations to protect against this damage. One of regulation is measuring the width and layer of the canopy the tree at the certain age. This indicator is also measuring a height of the tree. Until this day, the officer from the government and companies is using stick measurement (manual measurement) to do this. However, this manual measurement is not accurate especially for an area with hills or landslide and takes time. With this problem, we are offering the measurement for special condition by using UAV which is Multi-Rotor with a camera. This UAV is taking an image of the tree then calculate the height by using triangle similarity Method. The results show that using this method the difference result from real measurement with the application is 2.6% © Published under licence by IOP Publishing Ltd.
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