Paul Sestras Technical University of Cluj-Napoca Faculty of Civil Engineering Department of Land Measurements and Cadastre 72 Observatorului Street, 400363 Cluj-Napoca Romania Special Issue of Forests: Forest Ecology and Resource Monitoring Based on Sensors, Signal and Image Processing Special Issue of Applied Sciences: Modern Geospatial Data Acquisition, Tools and Applications in Interdisciplinary Research Special Issue of Forests Data Acquisition, Methods and Techniques Applied in Sustainable Forest Management and Hazard Mapping