Critical Analysis of Urban Vegetation Mapping by Satellite Multispectral and Airborne Hyperspectral Imagery Topics: Earth Observation and Satellite Data; Hyperspectral Imaging; Natural Resource Management; Spatio-Temporal Data Acquisition; Urban Remote Sensing In Proceedings of the 5th International Conference on Geographical Information Systems Theory, Applications and Management GISTAM - Volume 1, 97-104, 2019 , Heraklion, Crete, Greece