Civil Engineering and Architecture 7(6A): 1-6, 2019 http://www.hrpub.org DOI: 10.13189/cea.2019.071401 Monitoring Slope Condition Using UAV Technology Norhayati Ngadiman * , Ibrahim Adham Badrulhissham, Mazlan Mohamad, Nurazira Azhari, Masiri Kaamin, Nor Baizura Hamid Department of Civil Engineering, Centre for Diploma Studies (CeDS), Universiti Tun Hussein Onn Malaysia (UTHM), Malaysia Received July 30, 2019; Revised September 30, 2019; Accepted December 10, 2019 Copyright©2019 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract Slope failure is a serious geologic hazard in many countries in the world including Malaysia. In order to prevent slope failure, the hazardous symptoms can be detected early in slope monitoring process. Nowadays, slope failure symptoms monitoring has been done by human by on site observation at the slope spot and it is dangerous for the human safety. Furthermore, it takes longer time to complete the investigation and some of the data collected are inaccurate because human view is limited. Therefore, this project is to evaluate the performances of Unmanned Aerial Vehicle (UAV) to monitor the slope condition. A slope at Taman Harmoni Vista at Pagoh, Johor has been selected as a study area. The measurement of slope studied was 150 meters in length and 20 meters in height respectively. The aim of this project is to evaluate the performances of Unmanned Aerial Vehicle (UAV) to monitor the risk slope. Visual image of 3D modelling was obtained from Pix4D Mapper and Global Mapper software was used to analyze the slope failure symptoms. There are defects that have been identified from 3D modelling of the slope which is tension crack on slope and surface crack on the drainage. The use of UAV is an alternative method to obtain quality picture and 3D model for inspection of the slope. This method expected to facilitate the work of inspection slopes in addition to saving time, energy and cost as well asreducing the risk of harm. Keywords Slope Failure, Slope Monitoring, Unmanned Aerial Vehicle (UAV) 1. Introduction Landslides are usually found in the form of slope failure in a man-made slope, especially the slopes involved with cut and fill activities which often occur along highway area, residential area and urban area [1]. Slope falls, slope topples, landslides, flows and spreads of slope are types of slope failure [2]. Slope failures occur in many forms and there is a wide range in their predictability, rapidity of occurrence and movement, and ground area affected, all of which relate directly to the consequences of failure [3]. There are several types of slope failures that can occur when the shear resistance along the slip plane is exceeded. Slope falls, slope topples, landslides, flows and spreads of slope are the types of slope failure. These can be caused by excessive load imposed at the slope crest or compromised stability of the slope, and disturbed dimensions of the slope. Monitoring of slopes is a crucial method to predict early sign of slope failure and prevent slope from collapse. Conducting a quantitative study on the unstable slope area will be able to detect any movement on the slope. Therefore, detailed orthophotos are a valuable resource for mapping and classifying morphological phenomena that occur at that point [4]. Initial information obtained will provide preliminary information on the slope and be able to detect slope stability level prior to the occurrence of slope failure [5]. Monitoring is an important element of hazard identification, hazard assessment and hazard information which can be supported by Geographical Information Systems (GIS) and related databases. Nowadays, slope analysis is done by inspector that inspecting and monitoring will climb up to the top of the slope for the purpose of taking photographs for inclusion in the work report [6]. This method needed more time to complete the observation and the data was collected not too accurately because the human errors sometimes fail to read the data correctly. This study was conducted to determine the extent to which the use of Unmanned Aerial Vehicle (UAV) can assist in the slope monitoring process. The main objectives of this study are to produce a 3-dimensional model of the slope to determine defects that occur on the slopes. The UAV can be controlled by a safe distance from a risky slope. UAV can be manually or autonomously controlled [7]. Basically, the monitoring process can be done safely, quickly and more energy work can be saved by using this technology. The purpose of this paper was to identify the CITE THIS PAPER [1] Norhayati Ngadiman , Ibrahim Adham Badrulhissham , Mazlan Mohamad , Nurazira Azhari , Masiri Kaamin , Nor Baizura Hamid , "Monitoring Slope Condition Using UAV Technology," Civil Engineering and Architecture, Vol. 7, No. 6A, pp. 1 - 6, 2019. DOI: 10.13189/cea.2019.071401.