Introduction

The ESA Hub Fellowship was a deeply enriching and practical learning experience that significantly strengthened my skills in geospatial data production, validation, and humanitarian mapping. From the beginning, the fellowship introduced me to the mission of ESA Hub and the critical role that open geospatial data plays in disaster response, resilience building, and inclusive decision-making. I developed a strong understanding of the OpenStreetMap (OSM) ecosystem, humanitarian mapping principles, and the workflows of the HOT Tasking Manager, which laid a solid foundation for meaningful contributions to real-world projects.

Throughout the fellowship, I gained extensive hands-on experience in mapping and contributing to several humanitarian and disaster response projects. Using tools such as iD Editor and JOSM, I digitized key features including buildings, roads, waterways, and other critical infrastructure from high-resolution satellite imagery. I actively contributed to projects supporting humanitarian response in Sudan, Mapping for disaster resilience in Elgeyo Marakwet, and emergency response efforts for Hurricane Melissa in Jamaica, among many other projects. These contributions helped improve the availability and quality of geospatial data in under-mapped and disaster-affected regions, supporting responders and planners on the ground.

A major highlight of the fellowship was my involvement in data validation and quality assurance. I participated in multiple levels of validation, including in-depth third-pass validation of OSM data. This process required careful inspection of geometry accuracy, correct tagging, completeness, and adherence to OSM and HOT standards. Through this experience, I developed a strong eye for identifying common mapping errors such as misaligned features, incorrect classifications, duplicated objects, and incomplete networks. I also learned how to provide clear, constructive feedback to mappers, contributing to continuous learning and improved data quality within the community.

The fellowship further exposed me to advanced tools and workflows used in humanitarian mapping and data quality monitoring. I worked with JOSM validation tools and plugins, cross-checked multiple imagery sources to improve accuracy, and reviewed changesets to ensure consistency and reliability of mapped data. Beyond technical skills, the program emphasized collaboration and community engagement. Interacting with mappers from diverse backgrounds helped me appreciate the power of collective effort in building open, reliable geospatial datasets for global impact.

Overall, the ESA Hub Fellowship was a transformative experience that enhanced my technical expertise, analytical skills, and understanding of community-driven mapping for disaster response. It reinforced the importance of high-quality, validated geospatial data in humanitarian contexts and strengthened my commitment to using geospatial technologies for social good, disaster resilience, and sustainable development.