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Google Earth Engine × Mapbox - Reduction in NO2 by COVID-9

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HHirosaji
Last edited Jul 9, 2020
Created on Jul 3, 2020

This visualization compares nitrogen dioxide (NO2) density in Japan before and during the COVID-19 pandemic, using monthly mean satellite data from April 2019 and April 2020. The map displays a difference layer (2020 minus 2019) that highlights reductions in NO2, with an overlaid color legend ranging from red (negative change) to blue (positive change). Users toggle between the three datasets via radio-button tabs, which control Mapbox layer visibility through `map.setLayoutProperty`. The example combines Mapbox GL JS for the interactive map with D3.js v5 for tab event handling and legend updates, rendering spatial data as raster tiles over Japan.

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