1. a Geospatial Information Science Research Centre (GISRC), Faculty of Engineering , Universiti Putra Malaysia , 43400 UPM Serdang, Selangor , Malaysia
2. b College of Arts and Sciences, Universiti Utara Malaysia , 06010 UUM Sintok, Kedah , Malaysia
3. c Department of Civil Engineering, Faculty of Engineering , Universiti Putra Malaysia , 43400 UPM Serdang, Selangor , Malaysia
4. d Faculty of Computer Science & Information Systems , Universiti Teknologi Malaysia , 81310 UTM Skudai, Johor , Malaysia