植物生态学报 ›› 2001, Vol. 25 ›› Issue (5): 588-593.

• 论文 • 上一篇    下一篇

北京海淀区植被覆盖的遥感动态研究

陈云浩,李晓兵,史培军   

  • 发布日期:2016-05-11
  • 通讯作者: 陈云浩

Estimating Vegetation Coverage Change Using Remote Sensing Data in Haidian District ,Bejing

CHEN Yun-Hao, Li Xiao-Bing, Shi Pei-Jun and ZHOU Hai-Li   

  • Published:2016-05-11
  • Contact: FANG Jin-Yun

摘要: 植被覆盖度fg人(植被的垂直投影面积与单位面积之比)是一个十分重要的生态气候参数。为了有效地从遥感资料中提取植被覆盖度,发展了一套计算区域植被覆盖度的亚象元分解模型法。运用该方法对北京市海淀区1975、1991和1997年的植被覆盖度进行了计算,并在此基础上,求得研究区不同植被覆盖等级的变化转移矩阵,分析了海淀区22年来植被覆盖等级变化的空间过程和变化趋势。

Abstract: Vegetation coverage, the ratio of vegetation occupying a unit area, is a very important parameter in the development of climate and ecological models. On-ground fieldwork surveys of vegetation coverage are time consuming and expensive and produce low-precision results. Estimation of vegetation coverage from remote sensing data may be a more efficient approach. This study explores the potential of deriving vegetation coverage from normalized difference vegetation index (NDVI) using remotely sensed data. As each pixel of a TM image represents a mosaic of structures on the ground, sub-pixel models for vegetation coverage estimation are proposed. The utility of different sub-pixel models for vegetation coverage estimation based on land cover classification is also described. The accuracy of vegetation fraction estimation using this model is high. Vegetation coverage of Haidian district in 1975, 1991 and 1997 were modelled using this method in Beijing. The spatio-temporal patterns of change in vegetation coverage and its driving processes during this period are also discussed in this paper.