1. Dept. of Geomatics Engineering, The Univ. of Calgary, 2500 Univ. Dr NW, Calgary AB Canada T2N 1N4 (corresponding author).
2. Dept. of Geomatics Engineering, The Univ. of Calgary, 2500 Univ. Dr NW, Calgary AB Canada T2N 1N4.
3. Dept. of Civil Engineering, The Univ. of Calgary, 2500 Univ. Dr NW, Calgary AB Canada T2N 1N4.