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Study of crown information extraction of Picea schrenkiana var. tianschanicabased on high-resolution satellite remote sensing data |
Yufeng LIU1,2, Ying PAN3, Hu LI1,2 |
1. College of Computer and Information Engineering, Chuzhou University, Chuzhou 239000, China 2. R&D Center of Data Products and Application Software on Anhui High Resolution Earth Observation System, Chuzhou 239000, China 3. Students Affairs Department, Chuzhou University, Chuzhou 239000, China |
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Abstract For the reasons that images of Picea schrenkiana var. tianschanica in the western tianshan forest were round or suborbicular, crown information extraction was conducted with the space geometric features. According to the workflow of “investigating the features of Picea schrenkiana var. tianschanica in satellite images - extracting tree crown information-estimating tree crown width with remote sensing images”, a method for estimating tree crown width in Central Asia mountain forests based on remote sensing images was proposed and evaluated, with the purpose of challenging the problems that it is difficult to set the marks for marking watershed transform target ground objects and the active contour model evolution results are limited by the original positions of contour lines. Multi-scale blob detection, marking watershed transform and GVF Snake active contour model were orderly combined for tree crown information extraction. This technical process integrated and optimized the process of tree crown information extraction, and gained the tree crown contour distribution map of Picea schrenkiana var. tianschanica from images. A comparison with the measured tree crown width of each tree in the investigated sample ground shows that this method well estimates the tree crown width of Picea schrenkiana var. Tianschanica with high, medium or low canopy density, with the mean error being 10.8%, 4.5% and 6.4%, respectively. The research results provide a better solution for the key technical problem of tree crown interpretation for high-resolution remote sensing data in forest resource monitoring.
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Keywords
high resolution remote sensing
Picea schrenkiana var. tianschanica’s crown
multi-scale blob detection
marking watershed transform
GVF Snake model
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Issue Date: 03 December 2019
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