1. a National Space Institute, Department of Geodynamics , Technical University of Denmark , Copenhagen , Denmark
2. b Military Survey Department , Abu Dhabi , United Arab Emirates
3. c Institute of Geosciences , University of Bergen , Bergen , Norway
4. d GNSS and Geodynamics Research Group , Universiti Teknologi Malaysia , Skudai , Malaysia
5. e Info-Geomatik Sdn. Bhd. , Skudai , Johor Dard Takzim , Malaysia