Development of a portable measuring device for diameter Seite 25 138. Jahrgang (2021), Heft 1, S. 25-50 Development of a portable measuring device for diameter at breast height and tree height Entwicklung eines tragbaren Messgerätes für Durchmesser in Brusthöhe und Baumhöhe Fangxing Yuan1,2, Luming Fang1,2*, Linhao Sun1,2, Siqing Zheng1,2, Xinyu Zheng1,3 Keywords: DBH, tree height, sensor, algorithm, simulation Schlüsselbegri e: DBH, Baumhöhe, Sensor, Algorithmus, Simulation Abstract The diameter at breast height (DBH) and tree height are signi cant parameters of tree growth. Conventional measurement and recording methods take considerable time collect information on tree growth; where an intelligent electronic device (IED) could increase e ciency. The main achievements documented in this paper are: (1) an IED to accurately and e ciently measure DBH and tree height was developed, (2) a simple algorithm to estimate the DBH by using high-precision Hall angle sensors was designed. (3) A convenient tree height measurement method using a high-precision laser ranging sensor and dip sensor was designed. (4) A simulation experiment to analyze the DBH and tree height measurement range of the device at di erent an- gles was designed. (5) A personal computer (PC) software application was developed to automatically store and upload DBH and tree height data. The simulation results showed that the maximum measurable DBH and tree height were 151.47 cm and College of Information Engineering, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology, Hangzhou 311300, Zhejiang, China Key Laboratory of State Forestry and Grassland Administration on Forestry Sensing Technology and Intelligent Equipment Hangzhou 311300, Zhejiang, China *Corresponding author: Luming Fang,
[email protected] Seite 26 Fangxing Yuan, Luming Fang, Linhao Sun, Siqing Zheng, Xinyu Zheng 65.94 m, respectively.