1. Environment and Remote Sensing Research (EARTH) Laboratory, Department of Physics, College of Science, De La Salle University, 1004 Taft Avenue, Manila 0922, Philippines
2. Division of Physical Sciences and Mathematics, College of Arts and Sciences, University of the Philippines Visayas, Miagao 5023, Philippines
3. Department of Physics, College of Arts and Sciences, Visayas State University, Visca, Baybay City 6521, Philippines
4. Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan