Norbazlan Mohd Yusof
Manager, Database Management Department
Projek Lebuhraya Usahasama Berhad
Malaysia

Biography
NORBAZLAN MOHD YUSOF holds a Master of Remote Sensing and GIS from University Putra Malaysia in 2009 and Bachelor Degree Honours in Surveying and Mapping Sciences from the University of East London in the United Kingdom in 1996. He has more than 18 years of working experience in GIS particularly in highway asset management and currently holds the post as Head of Department where he is responsible for all matters pertaining to the Geoinformation technology in PLUS Berhad.

Abstract
Landslide Susceptibility Mapping along PLUS Expressways in Malaysia using Probabilistic Based Model in GIS

PLUS Berhad holds the concession for a total of 987 km of toll expressways in Malaysia, the longest of which is the North-South Expressway or NSE. Acting as the 'backbone' of the west coast of the peninsula, the NSE stretches from the Malaysian-Thai border in the north to the border with neighbouring Singapore in the south, linking several major cities and towns along the way. North-South Expressway in Malaysia contributes to the country economic development through trade, social and tourism sector. Presently, the highway is good in terms of its condition however some locations need more attention. Stability of slopes at these locations is of most concern as any instability can cause danger to the motorist. In 2011, PLUS took the opportunity to embark in a collaborative effort in landslide research initiative with Malaysia Remote Sensing Agency (MRSA) whereby two study locations have been analysed and they are Gua Tempurung and Jelapang which are located in the state of Perak at the northern part of Peninsular Malaysia. These locations passed through undulating terrain with steep slopes where landslides are common and the probability of slope instability due to human activities in surrounding areas is high. A combination of twelve (12) landslide conditioning factors database on slope stability such as slope degree and slope aspect were extracted from IFSAR (interoferometric synthetic aperture radar) while landuse, lithology and structural geology were constructed from interpretation of high resolution satellite data from World View II, Quickbird and Ikonos. All this information was analysed in geographic information system (GIS) environment for landslide susceptibility mapping using probabilistic based frequency ratio model. Consequently, information on the slopes such as inventories, condition assessments and maintenance records were assessed through Total Expressway Maintenance Management System or better known as TEMAN. The above mentioned system is used by PLUS as an asset management and decision support tools for maintenance activities along the highways as well as for data quality checking and integrity. In this study, TEMAN data were further analysed and subsequently integrated with landslide susceptible map for Gua Tempurung and Jelapang area.