Marine Water Quality in Hong Kong - Time Series Estimated from Satellite Images (2015-2021)

Supplementary materials used in the following journal article:

Kwong, I. H. Y., Wong, F. K. K., & Fung, T. (2022). Automatic mapping and monitoring of marine water quality parameters in Hong Kong using Sentinel-2 image time-series and Google Earth Engine cloud computing. Frontiers in Marine Science, 9, 871470. doi: 10.3389/fmars.2022.871470

Link to the article: https://www.frontiersin.org/articles/10.3389/fmars.2022.871470/

Online application developed using Google Earth Engine: https://khoyinivan.users.earthengine.app/view/marine-water-quality-hk

• Source code of the web application: GEE_TimeSeriesApp.js

Time-series video of the estimated water quality: https://youtu.be/b2zwPFGDKY8

Additional tool to obtain the parameters related to atmospheric constituents required for 6S atmospheric correction, including Water Vapour, Ozone and Aerosol Optical Thickness: https://khoyinivan.users.earthengine.app/view/atmospheric-constituents-for-6s

• Source code of the web application: GEE_6S_AtmosphericParameter.js

Analysis codes:

• Part1_ImagePreprocessing.ipynb

• Part2_ModelDevelopmentAndPrediction.ipynb

Other files:

• MarineQuality_2015-2020.csv: Marine Water Quality data measured at different Marine Water Quality Monitoring stations in Hong Kong from 2015 to 2020; Gathered from DATA.GOV.HK (https://data.gov.hk/en-data/dataset/hk-epd-marineteam-marine-water-quality-historical-data-en)

• MonitoringStation_wgs84_76_shp.zip: Locations of the 76 water quality monitoring stations in the open waters of Hong Kong (ESRI shapefile format); Equivalent to the Feature Collection ("users/khoyinivan/MonitoringStation_wgs84_76") in GEE; Extracted from Appendix A of the Annual Marine Water Quality Reports (https://www.epd.gov.hk/epd/english/environmentinhk/water/hkwqrc/waterquality/marine-2.html)

Last updated in December 2022