In the past few decades, the management of urban spaces with appropriate tools has been in constant discussion due to the plethora of new technologies that have emerged for participatory planning, drone mapping, photogrammetry and 3D modeling. In a multitude of situations, considerable progress has been made regarding the strategic impact of the successful use of technology for the development of urban spaces. The current era provides us with important digital tools and the opportunity to test new perspectives in the sustainable development of cities. This paper aims to explore the contribution of UAVs to the spatial mapping process of urban space, with the goal of collecting quantifiable and qualitative information to use for 3D modeling that can enable a more comprehensive understanding of the urban environment, thus facilitating urban regeneration processes. Three-dimensional models of high accuracy are not mandatory for this research. The location of the selected research area is particularly interesting due to its boundaries, urban voids and public space that can evolve through public participation. The results can be used for crowdsourcing in participatory decision-making processes and for exploring the consequences that these have on the built environment, and they can be used as a new means of involvement of citizens in local decision-making processes.

The aim of this chapter is to review how citizen science programs can contribute to each SDG, supported also by successful cases. Prerequisites have been the inclusion of at least one case from all five global areas and the field of interest is well spread through various study areas while the cases are only RFO or RPO projects. The design and implementation of this research is structured as follows. Each SDG is analyzed in a separate chapter. To begin with, the main goals of the relevant SDG are mentioned. The chapter continues with the relevance of citizen science projects to the respective goal. Ultimately, an example on how a citizen science project can make the goal effective is chosen. The case studies are selected based on their location, the timeframe of the project, and are structured beginning with the people or institutions involved, continuing with the project description and concluding with the project's contribution to the relevant SDG. The chapter then proceeds to a comparative case study analysis, with results and discussion in order to extract conclusions.