Avaliação de diâmetro e altura total de plantio misto com laser scanner portátil
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Data
2022-08-29
Autores
Oliveira, Klisman
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Universidade Federal do Espírito Santo
Resumo
The use of remote sensing equipment has been growing in the forestry scenario, associated with time savings and reduction of field work that can bring to projects, one of which is Light Detection and Ranging (LiDAR). The objective of the present work was to estimate the total height and diameter at breast height of different species in a mixed forest stand with Light Detection and Ranging data. A forest inventory was carried out to collect diameter at breast height and total height, from twelve different species of the Atlantic Forest, being collected ten class centers by species, totaling 120 measured arboreal individuals. The collections took place by means of a Portable Laser Scanner (PLS), the walking was carried out with the equipment in the eight areas studied, ranging from two to ten years of age. Through the walking, it was possible to generate the 3D point cloud of the plantations, from where the segmentation and cleaning of the studied trees was carried out, thus generating a point cloud for each isolated tree. Through the TreeLS and LiDR packages of the R software, it was possible to extract the metrics of diameter at breast height and total height of the point clouds of each tree. At the end of the segmentation, 92 trees of eleven different species were isolated, among the problems found for the isolation of the trees, the competition of the younger plantations with weeds and invasive trees. Another problem found was the competition between crowns, taking into account the intertwining between crowns and obstruction of the lasers by obstacles, which generated occlusions and noise, which made it impossible to isolate the trees. For the diameter metric, species in general the RMSE reached a value of 38.17%, the species Schizolobium parahyba obtained the best statistics reaching an RMSE of 13.14% and Bias 40.65%. The best statistics that Schizolobium parahyba arrived at can be associated with the similarity of growth with commercial species, from which the metrics in the used packages are usually processed. For the total height data obtained with PLS, the general RMSE (%) was 15.14 %, while its bias (%) was 17.73 %, in which four studied species obtained RMSE (%) below 10%, being Ceiba speciosa, Inga edulis, Tibouchina granulosa and Cedrela fissilis, being C. fissilis the only species with RMSE (%) below 5%. The species in general showed overestimated results of diameters at breast height and difficulty in segmenting the trees, whereas the total height metrics were obtained with greater precision, and similar to the statistics found in the literature.
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Sensoriamento remoto , Inventário florestal , Variáveis florestais , Manejo florestal , Nuvem de pontos