Publications

Men, J; Chen, X; Hou, XJ; Tian, JY; Song, QJ; Tian, LQ (2023). OC_3S: An optical classification and spectral scoring system for global waters using UV-visible remote sensing reflectance. ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING, 200, 153-172.

Abstract
Classification of water bodies is an effective means of understanding the optical properties of aquatic environ-ments. However, most existing water classification systems are mainly based on the visible domain, and the ultraviolet (UV) wavelength, which has important impacts on the growth of phytoplankton, has received less focus. In this study, we developed a novel water classification and spectral scoring system (denoted OC_3S) using 26,709 global in situ hyperspectral data. These spectral data range from the UV to visible domain (380 nm to 750 nm), covering waters from clear to turbid. OC_3S classified water types into 30 classes, providing detailed in-formation on the inherent optical properties and apparent optical properties of different water classes and quality assurance of remote sensing reflectance (Rrs) spectra for multiple sensor data. The results show that OC_3S can capture high-quality Rrs data with little loss of data volume. For example, the uncertainty of Rrs (443) can be reduced by-1.33 % at the cost of 5 % of observations in oligotrophic oceans. In addition, OC_3S performs more stably in turbid water classes compared to the QA system (Wei, J., Lee, Z., & Shang, S., 2016b. A system to measure the data quality of spectral remote-sensing reflectance of aquatic environments. Journal of Geophysical Research: Oceans, 8189-8207) because the coefficient of variation of OC_3S scores in turbid waters can be reduced by-44 % compared to that of QA scores. Moreover, good consistency was observed when OC_3S was applied to multiple current satellite images due to its superior tolerance to potential errors in atmospheric correction and radiometric calibration. Our OC_3S is capable of reducing the uncertainty of satellite products and could be applied to future sensors with UV bands (e.g., PACE).

DOI:
10.1016/j.isprsjprs.2023.05.017

ISSN:
1872-8235