EVALUATING THE ACCURACY OF THE REGULARIZED AND TENSION SPLINE INTERPOLATION METHODS TO ESTIMATE AND MAP THE CONCENTRATION OF NITRATE ON THE SURFACE WATER OF PULAU TUBA, LANGKAWI, KEDAH

Authors

  • Sharir Aizat Kamaruddin Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Behzad Khairiah Lee Mohd Affindi Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Noordalila Ramli Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Jumiati Mohd Tahir Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Nurrul Zulaikha Zainal Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Syasya Adhwa Ahmad Afiza Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Khairul Naim Abd.Aziz Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Muhammad Akmal Roslani Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Zamzila Erdawati Zainol Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Aziani Ahmad Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Mohd Idrus Shaari Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Rohayu Ramli Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Rosnani Nazri Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia
  • Jamil Tajam Fakulti Sains Gunaan, Universiti Teknologi MARA (UiTM), Cawangan Perlis, Kampus Arau, 02600, Arau, Perlis, Malaysia

Keywords:

Interpolation, Nitrate, Regularized, Spline, Tension

Abstract

This study aims to evaluate the efficiency of the regularized and tension spline interpolation methods to predict and map nitrate concentration on the surface water of Pulau Tuba, Langkawi. Kedah. Sampling activities were carried out using the Niskin Water Sampler and immediately brought into the lab to determine the nitrate level using an Ultraviolet Visible spectrophotometer and 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: 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 nitrate concentration. The accuracy of the map was found to be at 90%. The study's outcome can be used as guidelines by concerned parties to monitor, manage, and develop strategic policies for the sustainable development of the coastal water of Pulau Tuba, Langkawi, Kedah.

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2022-04-30

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