Pilot Activities in Creating Soil Maps from Satellite Data—Struma River Valley Case Study

Soil maps constitute a key factor in managing agricultural and forest plots. Their importance has increased with the implementation of innovative methods, such as precision agriculture, which are targeting the resilience to regional climate changes. Having up-to-date information on the soil current status is of extreme importance for updating the existing soil map. In this paper, a case study will be presented on the combined use of spectral data from in-situ and satellite measurements focused at producing information with regard to the soil composition and its physicochemical parameters. The most important result achieved in this research is the creation of a regional soil spectral library comprised of soil spectral signatures. Another important result is the update of the existing soil map for the studied region—Struma river valley located in the southwestern part of Bulgaria. As a result, a procedure for its regular modification will be outlined. This modern soil map can be valuable for a large number of stakeholders in the mentioned region—farmers, forest managers, and local authorities to name a few.