Paper by M. Woods et al: “Citizens’ Observatories (COs) seek to extend conventional citizen science activities to scale up the potential of citizen sensing for environmental monitoring and creation of open datasets, knowledge and action around environmental issues, both local and global. The GROW CO has connected the planetary dimension of satellites with the hyperlocal context of farmers and their soil. GROW has faced three main interrelated challenges associated with each of the three core audiences of the observatory, namely citizens, scientists and policy makers: one is sustained citizen engagement, quality assurance of citizen-generated data and the challenge to move from data to action in practice and policy. We discuss how each of these challenges were overcome and gave way to the following related project outputs: 1) Contributing to satellite validation and enhancing the collective intelligence of GEOSS 2) Dynamic maps and visualisations for growers, scientists and policy makers 3) Social-technical innovations data art…(More)”.