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Tree species classification of floodplain forest layers using multispectral UAV data
Majer, Hugo Miroslav ; Červená, Lucie (advisor) ; Homolová, Lucie (referee)
Tree species classification of floodplain forest layers using multispectral UAV data Abstract Master's thesis deals with a tree species classification in a multi-layered floodplain forest using high spatial resolution multispectral UAV data. The main objective was to verify the possibility, develop a methodology, and conduct tree species classification of individual forest layers of the targeted forest area and to quantify the extent to which it is possible to map the forest understorey obscured by higher forest layers using optical data. The classification legend consisted of five tree species. The developed methodology utilizes a 3D photogrammetric point cloud derived from multispectral UAV data, from which the threshold heights of individual forest layers were determined. The determination of forest layer heights was based on visualizations of the point cloud at selected locations using profile perspective. Three forest layers were established: upper, middle, and lower. The point cloud was filtered into individual forest layers, and the resulting point clouds were grided onto a raster. Data collected during field surveys of study area were used to create training and validation datasets for each forest layer. The rasters of each forest layer were classified using an object-based classification and a...
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Design of a dendrochronological database
Majer, Hugo-Miroslav ; Brůha, Lukáš (advisor) ; Brodský, Lukáš (referee)
The bachelor thesis focuses on the design of a spatial database of tree-ring chronologies. The theoretical part of the thesis describes database systems and the storage of spatial data in relational databases. It also reviews existing databases of tree-ring chronologies and the basics of dendrochronology. The next section describes provided dendrochronological data, which are used in methodical section of the thesis. The methodical section describes the data requirements for the created database, the process of its design and implementation within PostgreSQL/PostGIS. Subsequently, it deals with the creation of functions developed in procedural extension of SQL. The stored functions are used to improve import of data. Afterwards, the design of a data filter in the form of SQL statement is mentioned. The main result of the thesis is a spatial database that meets both data and functional requirements, contains provided data and is connectable to GIS. The thesis concludes with a summary of the achieved results and contributions to the ongoing scientific project. Keywords: spatial database, database design, tree-ring chronologies, PostgreSQL/PostGIS, Procedural Language/PostgreSQL
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