Extraction and spatial-temporal change analysis of bamboo forests in Changting County based on integrated terrain correction

Bamboo forests are one of the important forest resources in the mountainous and hilly areas of southern China， and the terrain shadow effect in this region is a crucial factor affecting the accuracy of bamboo forest remote sensing extraction. To eliminate the influence of terrain shadows， this study employed a recently proposed integrated terrain correction model to perform terrain correction on Landsat images of Changting County， Fujian Province in 2010 and 2022. The random forest method was applied to extract bamboo forests， and two indicators， namely， change magnitude and change rate， were used to analyze the spatiotemporal changes of bamboo forests from 2010 to 2022. Furthermore， the terrain differentiation effects of bamboo forest distribution in terms of elevation and slope were revealed. The results show that the integrated terrain correction effectively restored the spectral information of both the shadow and non-shadow areas， resulting in overall classification accuracy， mapping accuracy， and user accuracy of the extracted bamboo forests exceeding 0.8. The area of bamboo forests in Changting County changed by 34.79% from 2010 to 2022， with an average annual change range of 2.89%， indicating a significant growth trend. The distribution of bamboo forests exhibited clear terrain differentiation effects， primarily occurring in elevations ranging from 400 m to 700 m and slopes ranging from 8° to 25°.