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基于Landsat 9影像的景宁县山区竹林分布提取

Extraction of Bamboo Forest Distribution in Mountainous Areas of Jingning County Based on Landsat 9 Images

  • 摘要: 竹林作为一种高经济价值的森林资源,高效精确地监测其空间分布可为竹资源利用、生态保护提供数据支撑。相比传统人工调查的高成本,基于遥感影像提取竹林的方法具有高效、低成本的优势。然而,竹林与其他植被具有光谱相似性,给基于遥感影像的竹林提取工作带来了困难。本文以浙江省景宁县为研究区,基于Landsat 9影像、数字高程模型(Digital Elevation Model,DEM)及森林资源二类调查数据,采用随机森林(Random Forest,RF)算法进行竹林分布提取。结果表明,竹林提取总面积为13 340 hm2,精度验证总体精度达92.17%,Kappa系数为0.84。将提取结果与降水量、温度、地形数据进行叠加分析发现,景宁县竹林主要分布于海拔500~1 200 m、年均降水量1 560~2 000 mm、年均地表温度19~25 ℃的区域。基于该方法提取的竹林分布准确可靠,可为山区竹林监测提供参考。

     

    Abstract: Bamboo forest is a forest resource with high economic value, high efficiency and accuracy of monitoring of its spatial distribution provides data support for bamboo resource utilization and ecological protection. Compared to the high cost of traditional manual surveys, remote sensing image extraction of bamboo forests has the advantages of high efficiency and low cost. However, the spectral similarity possessed by bamboo forests and other vegetation poses challenges to the accurate extraction on remote sensing images. Taking Jingning County, Zhejiang Province as the research area, this paper utilized Random Forest (RF) algorithm to extract bamboo forest distribution on the basis of Landsat 9 images, Digital Elevation Model (DEM) and forest resource inventory data. The results showed that the total area of bamboo forest extraction was 13 340 hm2, with an overall accuracy of 92.17% and a Kappa coefficient of 0.84. Overlay analysis of the extracted results with precipitation, temperature, and terrain data found that bamboo forests in Jingning County were mainly distributed in areas with an altitude of 500~1 200 meters, an average annual precipitation of 1 560 ~ 2 000 millimeters, and an average annual surface temperature of 19~25 °C. The bamboo forest distribution extraction in this method is of accuracy and security, which can provide reference for monitoring bamboo forests in mountainous areas.

     

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