Institution: | Xi'an Research Institute of Surveying and Mapping, No. 1 Mid-Yanta Road, 710054 Xi'an, China e-mail: yuanxi@pub.xaonline.com; Tel.: +86 29 553 35 03; Fax: +86 29 552 53 10, CN Zhengzhou Institute of Surveying and Mapping, 66 Longhai Zhonglu, 450052 Zhengzhou, China, CN GeoForschungsZentrum (GFZ) Potsdam, Telegrafenberg A17, D-14473 Potsdam, Germany, DE
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