A novel cyanobacteria occurrence index derived from optical water types in a tropical lake

This repository contains files used in the publication 'A novel cyanobacteria occurrence index derived from optical water types in a tropical lake'. The files are the following: OWT_inland_mean_standardised_EXTENDED_DL.csv - Candidate library of 25 Optical Water Types (OWT) standardised spectra OLCI_LWQ_Polymer_v3_L3_WinamGulf_2016_2023_Cyanobacteria_Occurrence_index.nc - a netCDF file containing the dataset used to study cyanobacteria blooms in WInam Gulf in the period 2016-2023. The file contains: Remote Sensing Reflectance of Sentinel-3 OLCI bands (400nm - 1020nm) - named as "Rw*" Standardised specra between 412nm and 779nm - named as "Rw*_standardised" Spectral angle OWT membership score (Sowt) of the 25 water types of the proposed extended library - names as "Sowt_*" The novel weighted Sowt Sum metric - named as "weighted_sowts_sum" The novel Cyanobacteria Occurrence Index (COI) - named as "cyanobacteria_occurrence_index" coi.zip - a python package to calculate the COI from an input .nc satellite image. Instruction on its installation are inlcuded therein本仓库收录了发表于论文《热带湖泊中基于光学水型推导的新型蓝藻出现指数》的相关文件。所包含的文件如下： 1. OWT_inland_mean_standardised_EXTENDED_DL.csv：包含25种标准化光谱光学水型（Optical Water Type, OWT）的候选库。 2. OLCI_LWQ_Polymer_v3_L3_WinamGulf_2016_2023_Cyanobacteria_Occurrence_index.nc：该netCDF格式文件包含用于2016-2023年威纳姆湾（Winam Gulf）蓝藻水华研究的数据集，文件内含以下数据： - 哨兵-3 OLCI传感器各波段（400nm~1020nm）的遥感反射率，命名为"Rw*"； - 412nm至779nm波段的标准化光谱，命名为"Rw*_standardised"； - 所提出的扩展水型库中25种水型的光谱角度OWT隶属度得分（Sowt），命名为"Sowt_*"； - 新型加权Sowt总和指标，命名为"weighted_sowts_sum"； - 新型蓝藻出现指数（Cyanobacteria Occurrence Index, COI），命名为"cyanobacteria_occurrence_index"。 3. coi.zip：一款Python工具包，可从输入的netCDF格式卫星影像中计算蓝藻出现指数，其安装说明包含在该压缩包内。