ABSTRACT:Light Detection and Ranging or LiDAR data is a data source for deriving digital terrain model while Digital Elevation Model or DEM is usable within Geographical Information System or GIS. The aim of this study is to evaluate the accuracy of LiDAR derived DEM generated based on different interpolation methods and slope classes. Initially, the study area is divided into three slope classes: (a) slope class one (0° -5°), (b) slope class two (6° -10°) and (c) slope class three (11° -15°). Secondly, each slope class is tested using three distinctive interpolation methods: