[HTT20-P03] Characteristics of manual and automatically tree species classification in mixed forest (Yamagata University Research Forest)
Keywords:tree species classification, UAV, Yamagata Research Forest, Image processing, Photoscan
The Yamagata Research Forest offers the opportunity to study mixed forests with different conditions in different parts of the forest for doing automatically classifications of tree species. Till now two study sites were defined and image were taken with a camera detecting the visual spectrum of the light. Also, images were taken during different seasons (summer and autumn). After taking the images they needed to be processed. A first step is to generate orthomosaics by merging the images using Photoscan from Agisoft. As a result, DEMs, orthomosaics and 3D models were generated and can be further analyzed. In the next step the segmentation and classification of tree species should be done in an object-based way using feature information of the trees. After processing the images, it should be possible to create a model for deep machine learning which will be able to do the classification on its own.
During the last year the first image taking took place in different seasons in the Yamagata University Research Forest. Also, the image processing with Photoscan was finished. The first images were analyzed manually to check how it is possible to separate tree species automatically. To find out what are the important factors for doing automatically classification is the actual research status. Further, the presentation handles the comparison of manually and automatically ways for doing separations in this research. The results will be first approaches to do automatically classification/separations of tree species.
Fritz, A.; Kattenborn, T.; Koch, B., 2013: UAV-based photogrammetric point clouds – tree stem mapping in open stands in comparison to terrestrial laser scanner point clouds; International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XL-1/W2.
Michez, Adrien et. al, 2016: Classification of riparian forest species and health condition using multi-temporal and hyperspatial imagery from unmanned aerial system; Environ Monit Assess (2016) 188: 146; DOI 10.1007/s10661-015-4996-2; Springer International Publishing Switzerland 2016.
Onishi, Masanori and Ise, Takeshi, 2018: Automatic classification of trees using a UAV onboard camera and deep learning, https://arxiv.org/abs/1804.10390.
Torresan, C. et. al, 2016: Forestry applications of UAVs in Europe: A review, International journal of remote sensing, https://doi.org/10.1080/01431161.2016.1252477