This code is used in an publication on eutrophication in Italia (Lago di Fimon). It is developed to be run inside the Google Earth Engine platform. You need to have both Google (Gmail) and Google Earth Engine accounts in order to use it. The code allows studying the dynamics of the aquatic plants and algae distribution in lake Fimon with Sentinel-2 MSI: MultiSpectral Instrument, Level-2A data. You are free to adapt this code for any other lake in the world. In its current realization, it computes several multispectral image composites, GIF animation, and a chart showing total area covered by vegetation by month. Code structure The script (code.js) is divided into distinct sections: External packages Input variables Implementation Visualization Animated time series Developers Yaroslav Vasyunin, independent researcher, Italy Vasily Lobanov, RUDN University, Moscow License This project is licensed under the CC BY-SA 4.0.