Explore and Map: April Citizen Science Events

April, known as Citizen Science Month, offers many exciting projects for volunteers to join. The closest upcoming events include the City Nature Challenge (mapping urban nature) taking place directly in Brno, and the Missing Maps Mapathon (adding to maps based on satellite imagery), which will be held at the Masaryk University Campus in Bohunice. 

22 Apr 2026

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From April 24 to 27, 2026, the global project City Nature Challenge will take place. What began as a friendly competition between San Francisco and Los Angeles to see which city’s citizen scientists could document more evidence of living nature has, since 2018, grown into a worldwide event involving hundreds of cities across all continents.

In the Czech Republic, residents and visitors of Brno, Praha, České Budějovice, okolí Uherského Hradiště, Veselsko (including the cadastral areas of Veselí nad Moravou, Vnorovy, Strážnice, Uherský Ostroh, and Ostrožská Nová Ves), Ostrava , and newly also Olomouc. 

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Another public event is the Missing Maps Mapathon at the Department of Botany and Zoology MU. Missing Maps is a collaborative project that uses satellite imagery and OpenStreetMap to create maps vital for humanitarian crises, disasters, and the delivery of essential aid. 

  • When: Monday, April 27, 2026, from 18:00 to 20:30.
  • Where: Department of Botany and Zoology (Room B09/316), University Campus Bohunice, Kamenice 753/5, Brno.

Computers will be available for those do not have their own laptop. No prior experience is required; all tools are free and open-source. After a brief training session in the iD editor, you will work together with other volunteers to map areas where Doctors Without Borders (Médecins Sans Frontières) operate.

Requirements:

  • Beginners and experienced mappers are both welcome.
  • Create an account on OpenStreetMap beforehand.
  • If you bring your own laptop, please bring a mouse as well.

After the event, you can reward yourself with a visit to a pub. For more information, and on behalf of the organizers, Daniel Kašík (kasik@sci.muni.cz) looks forward to meeting you.

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These events are just a small example of the many ways citizen scientists can get involved. 

Pictures sources:

  • https://www.brnenskadzungle.cz/
  • https://missingmaps.org/

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