期刊
REMOTE SENSING OF ENVIRONMENT
卷 211, 期 -, 页码 184-195出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2018.04.002
关键词
Individual tree crown detection; Sub-meter satellite images; Marked Point Process; Trees outside forests; Template matching
资金
- Brazilian Federal Government, through the National Institute of Colonization and Land Reform (INCRA)
This article describes a new algorithm for the detection and delineation of tree crowns using optical sub-meter resolution satellite images. The algorithm focuses on detecting individual semi-isolated trees in a variety of environments defined as trees outside forests (TOF). The concept of Marked Point Processes (MPPs), which alternates phases of birth and death iterations to satisfy a density factor was used as a theoretical basis. The mark in the MPP represents the object being sought. Unlike most applications of MPP to object recognition, the mark used in our algorithm is computed from a 3D geometrical optical model artificially lit using the same illumination parameters as the image itself. Because trees differ in size, the process also incorporates a tree crown radius variable. The algorithm is tested on four sub-meter satellite images, each in a different environment. Validation was performed on both detection and delineation. The detection was based on tree crown counting and yielded an accuracy ranging from 0.81 to 0.95 for the four images. The delineation accuracy was estimated based on the crown pixel count and yielded an accuracy of approximate to 0.63 (0.57-0.72).
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