1. Research Assistant, Ph.D. Student, Faculty of Geodesy, Univ. of Zagreb, Kačićeva 26, 10000 Zagreb, Croatia (corresponding author).
2. Research Assistant, Ph.D. Student, Faculty of Geodesy, Univ. of Zagreb, Kačićeva 26, 10000 Zagreb, Croatia.
3. Full Professor, Faculty of Geodesy, Univ. of Zagreb, Kačićeva 26, 10000 Zagreb, Croatia.