Identification of Emergent and Floating Aquatic Vegetation Using an Unsupervised Thresholding Approach: A Case Study of the Dniester Delta in Ukraine Topics: Earth Observation and Satellite Data; Ecological and Environmental Management; Hydrological Remote Sensing; Image Processing and Pattern Recognition; Land Management; Natural Phenomena Data Acquisition; Natural Resource Management; Spatial Data Quality and Uncertainty; Spatio-Temporal Data Acquisition; Topological Modeling and Analysis; Urban and Regional Planning; Water Information Systems In Proceedings of the 9th International Conference on Geographical Information Systems Theory, Applications and Management GISTAM - Volume 1, 98-103, 2023 , Prague, Czech Republic