The UDSA ontology: An ontology to support real time urban sustainability assessment

•The urban district sustainability assessment ontology has been developed based on current schemes systematic review and existing ontological resources.•Environmental, social and economic impacts are holistically considered via an improvement of the information semantic and interpretability.•Heterogeneous information sources for the calculation of key performance indicators are unified around a common semantic model.•The UDSA ontology helps in the creation of linked data related to sustainability at the district level.