Poommirat, P., Sengtan, A., Maparasop, P., Limpanasittichai, N. and Pranchai, A. 2021. Health Assessment of Avicennia spp. Forest Through an Unmanned Aerial Vehicle Located at the Upper Gulf of Thailand . Thai Journal of Forestry. 40, 2 (Dec. 2021), 17–28.