1. Shandong University of Science and Technology,College of Geomatics,Qingdao,P.R. China
2. Shandong Drug And Food Vocational College,Zibo,P.R. China
3. Shandong Provincial Institute of Land Surveying and Mapping,Jinan,P.R. China
4. Binzhou Polytechnic,Binzhou,P.R. China