The purpose of this thesis is to evaluate utilization of terrestrial and aerial photogrammetry in the forest inventory process. It describes and analyzes data collection and processing in Agisoft PhotoScan and ArcGIS software, with the use of automatically calculated tree parameters from a photogrammetric point cloud obtained by imaging the inside of the forest stand in combination with an imagery from air using unmanned aerial vehicle (UAV). Individual trees were identified and modelled using an algorithm, next cuts at the breast height were created from the photogrammetric cloud and finally diameter in breast (DBH) was calculated for each tree as well as the tree height was assigned to the position of each tree stem. The error of the diameter estimation was observed to be 3,3 cm root mean square error (RMSE) and the height estimation error was 1,3 m. Apart from the mentioned accuracy, the main advantage of the proposed work is shorter time demand for field measurement; we could complete both inventories of 1 hectare forest stand in less than 2 h of field work.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:428130 |
| Date | January 2017 |
| Creators | Řezba, Martin |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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