1. Research Institute of Forest Resources Information Techniques, Chinese Academy of Forestry, Beijing 100091, China 2. Key Laboratory of Forestry Remote Sensing and Information System, NFGA, Beijing 100091, China 3. Academy of Forest and Grassland Inventory and Planning, Beijing 100714, China
Plantation in southern China is growing rapidly, and rotation cutting period is short. To explore the forest change detection method used to update the forest resource database effectively and to monitor the dynamic changes in forest harvesting and renewal in a short period, the authors chose the plantation area of Shangsi County in Guangxi as the study area, where the plantation area changes frequently and rapidly and the change patterns are numerous and small. The GF-2 remote sensing images of two phases were used as data sources. Multi-scale segmentation and spectral difference segmentation were used to segment the two-phase images. The change areas and change types were extracted from the NDVI difference of the objects and the threshold value was determined based on the distribution function, so as to realize the rapid detection of forest change. In addition, the same method was adopted for pixel-based processing in comparison with object-oriented NDVI difference method. The results show that the overall accuracy of the object-oriented NDVI difference method is 87.12%, and the Kappa coefficient is 0.81. The accuracy and extraction effect are better than those of the pixel-based NDVI difference method, indicating that the object-oriented NDVI difference method can better depict the shape and boundary of the change spots and can also more accurately detect the small change area. This method can be adapted to detect the changing characteristics of plantation in south China and can also be used to update the forest resource database for the purpose of rapid change detection.
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