Topio: An Open-Source Web Platform for Trading Geospatial Data. - Andra Ionescu; Kostas Patroumpas; Kyriakos Psarakis; Georgios Chatzigeorgakidis; Diego Collarana; Kai Barenscher; Dimitrios Skoutas 001; Asterios Katsifodimos; Spiros Athanasiou (ICWE, 2023)