1. Dept. of Geodesy and Geomatics Engineering, Univ. of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3. E-mail: s298d@unb.ca
2. Dept. of Geodesy and Geomatics Engineering, Univ. of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3. E-mail: dare@unb.ca
3. Dept. of Geodesy and Geomatics Engineering, Univ. of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3. E-mail: vanicek@unb.ca