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Date: 02/27 (Thu)
Time: 14:45-16:30
Place: 8-1-03
Speaker: Ahmad Shaqeer

Title:

LCTF & Light Source Calibration Study & Factors that affecting the Water Spectro-polarimetric Experiment


Abstract:
Riverine wetlands are of particular interest as it provides most of the water requirements. However, water pollution has become a serious issue in Malaysia due to its major threat to the ecosystem and reduces water production and supply to the houses. The traditional approach of finding and monitoring wetland using in situ measurement methods is found to be infeasible given the cost and time requirements and difficulties in accessing the required area. Thus, remote sensing-based methods using multispectral are more favored. Even still, the methods have shortcomings such as it has a specific spatial resolution, dependent on weather conditions, besides with water bodies have low spectral reflectance, and a certain type of wetlands share the same spectral characteristics with water, thus, increasing the difficulty in distinguishing both features. The multiple pointing satellite system is required to combat the problems yet it requires new measurement techniques. Therefore, this study focuses on the bidirectional reflectance factor (BRF) measurement of polluted water. BRF measurement helps in calculating the reflectance with respect to the changing of the angles i.e. azimuth, zenith, light incidence, camera reflected, and polarization angles. Furthermore, polarization helps in separating the polarized and unpolarized effect of the light reflected by the surface. This phenomenon will help in obtaining the information on the water near-surface condition. This seminar focuses on the calibration of the camera and the light source on the goniophotometer including factors that affecting the water measurement such depth, angle and water waves. By addressing such factors, polluted water measurement can be done reliably.

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