In this session a broad introduction to In-situ data and the definitions used was given. It provided an overview of authoritative and non-authoritative data sources, the importance of In-Situ data for training remote sensing deep learning models (showcasing WorldCover and C-GLOPS training data sets, etc.) and other citizen science data (e.g. iNATURALIST etc.). Methods for how in-situ data can be extracted from Mapillay and Streetview were also discussed.