Spectral feature selection optimization for water quality estimation

Manh Van Nguyen, Chao Hung Lin, Hone Jay Chu, Lalu Muhamad Jaelani, Muhammad Aldila Syariz

研究成果: Article

2 引文 斯高帕斯(Scopus)

摘要

The spatial heterogeneity and nonlinearity exhibited by bio-optical relationships in turbid inland waters complicate the retrieval of chlorophyll-a (Chl-a) concentration from multispectral satellite images. Most studies achieved satisfactory Chl-a estimation and focused solely on the spectral regions from near-infrared (NIR) to red spectral bands. However, the optical complexity of turbid waters may vary with locations and seasons, which renders the selection of spectral bands challenging. Accordingly, this study proposes an optimization process utilizing available spectral models to achieve optimal Chl-a retrieval. The method begins with the generation of a set of feature candidates, followed by candidate selection and optimization. Each candidate links to a Chl-a estimation model, including two-band, three-band, and normalized different chlorophyll index models. Moreover, a set of selected candidates using available spectral bands implies an optimal composition of estimation models, which results in an optimal Chl-a estimation. Remote sensing images and in situ Chl-a measurements in Lake Kasumigaura, Japan, are analyzed quantitatively and qualitatively to evaluate the proposed method. Results indicate that the model outperforms related Chl-a estimation models. The root-mean-squared errors of the Chl-a concentration obtained by the resulting model (OptiM-3) improve from 11.95 mg · m−3 to 6.37 mg · m−3, and the Pearson’s correlation coefficients between the predicted and in situ Chl-a improve from 0.56 to 0.89.

原文English
文章編號272
期刊International journal of environmental research and public health
17
發行號1
DOIs
出版狀態Published - 2020 一月

    指紋

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

引用此