The Sentinel-5P Coordinate Explorer is an open-access web application built on the Google Earth Engine (GEE) platform to democratize access to satellite-based atmospheric information. Developed by Dr. César Iván ?lvarez (University of Augsburg, Germany), the tool focuses on transforming the Sentinel-5P TROPOMI dataset into an intuitive and fast visualization environment.

- Purpose

The goal of the application is to help researchers, environmental practitioners, students, and the public quickly understand air pollution patterns—especially in cities where no ground stations exist.

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- Data and Functionality

The application uses the ESA Sentinel-5P TROPOMI instrument (2018–2025) to compute monthly medians for key atmospheric pollutants:

??? ?Nitrogen dioxide (NO?) – a major pollutant from traffic and combustion processes

??? ?Sulfur dioxide (SO?) – typically from industrial activities and power plants

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Users can:
- Click on any point on the world map to retrieve pollution values.
- Enter latitude and longitude manually.
- Select year and month to visualize pollution over time.

- Generate dynamic visualizations directly in the browser.

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Behind the scenes, the application uses GEE to perform spatial queries, temporal aggregation, and optimized visualization for fast rendering—even at global scale.
The tool promotes:
- Accessibility: runs in any browser, no GIS skills needed
- Reproducibility: based entirely on public Sentinel-5P data
- Transparency: users can inspect the underlying GEE script

- Scalability: designed for global use

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Citation:
?lvarez, C. I. (2025). Sentinel-5P Coordinate Explorer: A Web Application for Accessing Monthly Median NO? and SO? Concentrations Using Google Earth Engine. University of Augsburg.

Available online:

here

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