Requirements for Urban Data Platform Federation Across Cities

Urban Data Platforms (UDPs) are increasingly being adopted by cities to collect, analyze, share, and use<br/>data from diverse urban sources. However, data sharing across UDPs from different cities is in its<br/>infancy due to technical, organizational, and regulatory challenges. This paper addresses these issues by<br/>exploring the concept of UDP federation as a decentralized, interoperable approach to supporting crosscity data sharing while ensuring data sovereignty and legal compliance. Using a systematic literature<br/>review approach, we analyzed sixteen peer-reviewed articles and identified five main requirement areas<br/>for effective UDP federation: governance and sovereignty, scalable infrastructure, interoperability, privacy<br/>and security, and regulatory compliance. These findings provide a theoretical foundation for designing<br/>federated data-sharing ecosystems to foster urban innovation among municipalities.