Spectral and Spatial properties of Seaweed Farming at South Sulawesi
Muhammad Banda Selamat (a*), Rustam (b), Muhammad Farid Samawi (a)

a) Marine Sciences, Universitas Hasanuddin
Jl. P. Kemerdekaan km 10, Makassar 90245, Indonesia
* mbandaselamat[at]unhas.ac.id

b) Aquaculture, Universitas Hasanuddin

Abstract

Indonesia^s total seaweed production in 2020 was estimated to reach 9.6 million tons, and 36% of production comes from South Sulawesi. The Seaweed farming areas in South Sulawesi are commonly found over the East, South, and West coasts covering 17 districts. This study aims to examine the differences in the spectral characteristics of seaweed farming on the west and east coasts of South Sulawesi, based on the Sentinel 2 satellite optical sensor^s spectral bands. It examines the spatial character of seaweed farming in the two regions as well. There were two Sentinel 2 imagery used, namely T50MQV as the representation of the West coast, and T51MTR which represents the East coast. Both images were atmospherically corrected using the DOS method to obtain reflectance values. Resampling was done to all bands to get a uniform spatial resolution at 10 meters. The TSS (Total Suspended Solid) algorithm was applied to obtain a TSS image. The statistic shows that both two areas were different spectrally. On the West coast, TSS inside of seaweed farming units commonly does not differ from the surrounding environment. While on the East coast, the TSS in the seaweed farming unit is generally lower than its surrounding. Overall, the TSS level on the West coast is lower than on the East coast. Seaweed farming units on the West tend to be closer to the coast and have a smaller size area compared to those on the East coast.

Keywords: seaweed farming- Sentinel 2- remote sensing- TSS

Topic: Marine and Fisheries Geographic Information System (International)