The Mapping of Salinity Level Using The Inverse Distance Weighted (Idw) Interpolation Method Along The Coastal Area of Pulau Tuba, Langkawi

The purpose of this study is to investigate the accuracy Inverse Distance Weighted (IDW) interpolation method estimate and map surface water salinity along coastal waters Pulau Tuba, Langkawi. Sea was recorded using a refractometer during two sampling activities that were carried out in November 2018. Global Positioning System (GPS) used record geo-location each point. IDW applied data collection ArcGIS Software. Statistical analyses such as correlation analysis, regression error analysis employed assess prediction values. transformation spatial model later map. found there strong positive correlation, r= .753 (p< .05) with coefficient determination 56.80% between observed predicted Mean Absolute Error (MAE) Root Square (RMSE) calculated at 0.724466 0.921728, respectively. 81.25%. also reading polyhaline Tuba. Overall, has provided tool predict