Abstract
Abstract. Laguna Lake is significant to its surrounding cities and municipalities as it serves multiple purposes: flood basin, aquaculture, water source for irrigation and domestic use, among others. Monitoring the lake’s water quality is an integral part ensuring that the lake would continue to serve its purposes. Bio-optical modelling is a type of empirical model that relates the inherent optical properties of water to different biological properties like chlorophyll-a. The BOMBER (Bio-Optical Model Based tool for Estimating water quality and bottom properties from Remote sensing images) tool makes use of the different IOPs apparent optical properties (AOPs) of satellite images to be able to produce water quality maps. To localize the parameters used by the BOMBER tool, the use of WASI (The Water Color Simulator) tool was introduced. Inverting in situ spectral measurements of the lake, WASI tool was able to produce parameters localized for the lake. This research used 2018 Landsat 8 Images to produce images and used a water profiler to validate results. Results show the bio-optical model provided a R-squared value of 0.6912 and an RMSE of 2.43 μg/l which shows good correlation between the in-situ and the bio-optical model results.
Highlights
1.1 Bio-Optical ModellingOne of the main applications of remote sensing is the water quality estimation of water bodies
For suspended particulate matter (SPM) (Figure 9), the result ranges from 0-90 μg/l with bulk of the values concentrating in the 30-60 μg/l range
The performance of BOMBER significantly improved when inversed parameter values are used instead of the defaults
Summary
One of the main applications of remote sensing is the water quality estimation of water bodies. Using remote sensing for water quality mapping is advantageous because of the abundance of data, and the large scale of the area an image can have. One of the approaches for estimating water quality is biooptical modelling. The concept of bio-optical modelling came from the expression “bio-optical state of ocean waters” in 1978 (Ogashawara, Mishra, & Gitelson, 2017). A bio-optical model is a tool used to analyse and predict the optical properties and biological materials in bodies of water. Models are created to address the need to acknowledge that optical properties of water bodies are essentially subordinated to its biological activity and are significant in determining the current and possible sate of a water body
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