Detecting droughts in Southwest China from GPS vertical position displacements
YAO Chaolong, LUO Zhicai, HU Yueming, WANG Changwei, ZHANG Rui, LI Jinming
Acta Geodaetica et Cartographica Sinica . 2019, (5): 547 -554 .  DOI: 10.11947/j.AGCS.2019.20180308