| Summary: | This study aims to evaluate the efficiency of the regularized and tension spline interpolation methods to predict and map the concentration of nitrate on the surface water of Pulau Tuba, Langkawi. Kedah. Sampling activities were carried using the Niskin Water Sampler and immediately brought into the lab for the determination of the level of nitrate using an Ultraviolet Visible spectrophotometer and referring to the cadmium reduction method. The geolocations of sampling points were recorded using the Geographic Positioning System (GPS). The training set (50%) and the testing set (50%) were chosen randomly based on 20 sampling points. Two types of spline interpolation methods were compared which were the regularized and tension spline interpolation methods. Evaluation of prediction of models was carried out using the correlation analyses, linear regression analysis and error analyses when comparing the actual and prediction values. Determination of the map accuracy was carried out after inserting map elements. The study found that the tension spline method had a better prediction of the concentration of nitrate. The accuracy of the map was found to be at 90%. The outcome of the study can be used as guidelines by concerned parties to monitor, managed and developed strategic policies for the sustainable development of the coastal water of Pulau Tuba, Langkawi, Kedah.
|
|---|