Date: 6th November 2025.
City: Barcelona.

The 100KTREEs side event, held during the Smart City Expo World Congress 2025, brought together city representatives, practitioners, researchers, and technology providers to explore how large-scale citizen engagement can strengthen urban resilience. The event consisted of two repeated 1.5-hour sessions, combining demonstrations of the 100KTREEs tools with open discussion on their real-world applicability.

The session showcased how the project’s digital services such as tree mapping, ecosystem-services modelling, and the citizen-science app, can help cities plan, plant, and monitor urban trees more effectively.

Key Discussion Outcomes

Participants emphasised that citizen participation is essential for long-term urban adaptation. By involving residents in tree planting, monitoring, and maintenance, cities can build shared responsibility and increase public awareness of climate challenges. However, engagement must be continuous, well-designed, and supported by clear communication if it is to lead to lasting impact.

A major focus of the event was how 100KTREEs can expand from pilot projects to broader city deployment. Successful scaling requires:

• A clear operational model;
• Interoperable digital tools able to integrate diverse datasets and support multi-stakeholder collaboration;
• Flexible frameworks adaptable to different neighbourhoods and community profiles.

The use of high-resolution satellite data was highlighted as a powerful enabler of wide-area applicability.

Participants agreed that data is crucial for identifying planting priorities, modelling environmental impacts, evaluating community involvement, and ensuring transparent reporting. Although many datasets already exist, they are often fragmented or outdated. The discussion underscored the need for standardised methodologies and open-data approaches to ensure greater consistency across cities and support broader adoption of the 100KTREEs toolbox.

More information on this event can be found in this article.

The 100KTREES Citizen Science App

The 100KTREES modelling tools

Date: 19th November 2024.
City: Genova

The workshop gathered 36 experts from the Municipality of Genoa, Aster, the University of Genoa (DICCA), iiSBE Italia R&D, GISIG, and European partners of the 100KTREEs project. Moderated by GISIG, the event consisted of three main sessions:

1. Presentation of the 100KTREEs project, including demonstrations of tools for tree mapping, satellite-data enrichment, ecosystem services modelling, and the citizen-science app for crowdsourced data collection.
2. Local perspectives, with contributions from the Municipality of Genoa on the Green Plan and from Aster on risk planning related to tree planting.
3. Discussion of needs and requirements, also featuring inputs from the Interreg projects REMED and ADAPTNOW on resilience and climate adaptation

Key outcomes highlighted Genoa’s need to:

• Improve and complete its urban tree database, particularly for private areas.
• Strengthen implementation of the Green Plan through scheduling, dedicated teams, and suitable planning tools.
• Enhance communication and citizen engagement.
• Integrate tree-related data more systematically into urban planning.

The 100KTREEs project can support Genoa through:

• A citizen-science app to collect missing tree data (potentially translated and adapted to local species).
• Ecosystem services modelling to inform planning, risk mitigation, and public communication.
• A European network of cities committed to adopting and benefiting from the toolbox.