1College of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan 250014, China
2College of Geomatics, Shandong University of Science and Technology, Qingdao 266510, China
Submission date: 2016-08-15
Final revision date: 2016-12-19
Acceptance date: 2017-02-08
Online publication date: 2017-07-21
Publication date: 2017-07-25
Pol. J. Environ. Stud. 2017;26(4):1693–1699