Zhang, Hongming, Jiangtao Yang, Jantiene E.M. Baartman, Shuqin Li, Bei Jin, Wenting Han, Xiaomei Yang, Lingtong Gai, Coen J. Ritsema, and Violette Geissen. 2018. “Quality of Terrestrial Data Derived from UAV Photogrammetry: A Case Study of Hetao Irrigation District in Northern China”. International Journal of Agricultural and Biological Engineering 11 (3):171-77. https://doi.org/10.25165/ijabe.v11i3.3012.