Conference Paper (unpublished)

Using Polsar to Assess Temporal Trends of Water Hyacinth Infestation in Lake Victoria

Details

Citation

Isundwa FK, Simpson M, Akbari V, Datta A, Nagendra P, Pranuthi G, Silva T, Rupavatharam S & Marino A (2023) Using Polsar to Assess Temporal Trends of Water Hyacinth Infestation in Lake Victoria. 2023 IEEE India Geoscience and Remote Sensing Symposium (InGARSS), Bangalore, India, 10.12.2023-13.12.2023. https://doi.org/10.1109/ingarss59135.2023.10490369

Abstract
Water hyacinth (WH) is a dreadful invasive species in Lake Victoria which spreads and forms vast floating mats on the lake. In-situ monitoring of its spread is costly and time consuming compared to remote sensing-based techniques. In this research, the temporal variability of WH in Winam Gulf of Lake Victoria is assessed using Polarimetric SAR data by applying the Optimization of Power Difference (OPDiff) change detection technique. Sentinel-1 IW SLC data acquired between 2017 and 2022 were analyzed using their covariance matrices generated from the VV, VH and VV*VH. The detector separated WH from clear water using the minimum eigenvalues which enable rejection of false alarm from polarized scattering (e.g., water waves and wind) while selecting contribution from unpolarized scattering. The average precision and accuracy were 92.6% & 89.9% depending on WH density. The algorithms allowed quantification of temporal monthly and annual trends which established that highest WH amounts were recorded in 2018 within the last 4 months of the year.

StatusUnpublished
FundersRoyal Academy of Engineering, Biotechnology and Biological Sciences Research Council and Natural Environment Research Council
Publication date10/12/2023
PublisherIEEE
Conference2023 IEEE India Geoscience and Remote Sensing Symposium (InGARSS)
Conference locationBangalore, India
Dates

People (5)

Dr Vahid Akbari

Dr Vahid Akbari

Lect in Artificial Intelligence/Data Sci, Computing Science and Mathematics - Division

Mr Felix Isundwa

Mr Felix Isundwa

Tutor, Biological and Environmental Sciences

Dr Armando Marino

Dr Armando Marino

Associate Professor, Biological and Environmental Sciences

Dr Thiago Silva

Dr Thiago Silva

Senior Lecturer, Biological and Environmental Sciences

Mr Morgan Simpson

Mr Morgan Simpson

Radar Remote Sensing Scientist, Biological and Environmental Sciences