From 28-31 October 2019, the fourth technical training took place. This time is in Valencia, Spain. The focus this time was particularly on cultural heritage monitoring and start-up creation. Participants spent four days learning about machine learning Random Forest for classification, start-up creation, Laser scanning, and Ground Penetrating Radar (GPR) usage, multicriteria decision analysis and UAV demonstration. Want to read more about the meeting? Check the report!