New devices are rapidly being integrated, and new methods are being explored that could bring about the simplification and streamlining of certain procedures of work. The most important role in forest taxation is the measurement of basic dendrometric quantities. In the last decade, forestry has been trying to adapt to new trends in modern technology. All this is performed on the example of a selected part of a spruce forest in the mountains area in the Czech–German border region. The methods analyzed are classical methods, laser scanning with different devices, aerial methods, photogrammetry, the use of drones, SLAM technology (simultaneous localization and mapping), and mobile mapping methods, as well as cheap methods using smartphones and tablets. The article discusses methods for using possible sensors in forest inventory. Quantitative forestry information (cubic capacity of wood) has so far been obtained using ground analyses and calculations using evaluation tables. These technologies can supply map data, with remote sensing providing further qualitative information on vegetation. In the last decade, other technologies have been used, such as terrestrial laser scanning (TLS), aerial laser scanning (ALS), and mobile laser scanning (MLS). Forestry and agriculture are traditional users of photogrammetry and remote sensing. The main task of dendrometry is to quantify the volumes of individual trees and stockpiles of whole stands, to measure intermediate quantities, and to develop and use procedures and methods for determining the volumes and stocks of wood. ![]() Our results are mainly oriented to practice and in no way diminish the general research in this area.ĭendrometry deals with the determination of the quantitative parameters of standing trees and forest stands, the relationship between these parameters, and the development of methods for capturing them. The results from our research into forestry show that drones can be used to estimate quantities (wood cubature) and inspect the health status of spruce forests, However, PLS seems, nowadays, to be the best solution in forest management for deriving forest parameters. On the other hand, the use of PLS is very simple and allows you to quickly define ordered parameters and further calculate, for example, the cubic volume of wood stockpiles. ![]() The use of conventional terrestrial close-range photogrammetry and TLS proved to be inappropriate and practically unusable in our case, and also in standard forestry practice after consultation with forestry workers. If the approximate height and number of the trees are known, one can approximately calculate the extracted cubage of wood mass before forest logging. ![]() The RPAS (remotely piloted aircraft systems, known as “drones”) method of data acquisition combines the benefits of close-range and aerial photogrammetry. ALS is expensive for small areas and the results were not suitable for a detailed parameter derivation. Results from the data joining, usability, and economics of all technologies for forest management and ecology were discussed. In this locality, terrestrial laser scanning (TLS) and terrestrial and drone close-range photogrammetry were experimentally used, as was the use of PLS mobile technology (personal laser scanning) and ALS (aerial laser scanning). ![]() As a case project, a mountain spruce forest with planned forest logging was selected. The present text summarizes the results of our measurements over the last five years. This contribution focuses on a comparison of modern geomatics technologies for the derivation of growth parameters in forest management.
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