摘要
介绍了分形几何学理论及其特点。首先,基于GIS、RS技术,利用多源遥感影像融合技术和GIS叠置对比分析功能、人机交互解译,得出北京市野鸭湖湿地自然保护区及周边区域在1998年、2000年和2002年湿地资源现状;再利用方正智慧软件统计出各类型湿地图斑的周长和面积,并求出面积、周长的对数,根据二维欧氏空间分形维计算模型,计算出各类型湿地资源的分形维数值和稳定性指数;最后,根据分行维数和稳定性指数的物理意义,揭示了野鸭湖地区湿地资源的动态变化情况。研究表明,沼泽和湖泊是该区域湿地环境的主体,也是最脆弱的湿地要素;湿地资源分形维数(D)和稳定性指数(SK)可以为湿地环境评价、湿地资源的合理利用与可持续发展提供决策依据。
The theory and characteristics of the fractal theory are described. The wetland data of the Beijing Wild Duck Lake in 1998, 2000 and 2002 were obtained on the basis of RS and GIS technology. Using the fractal dimension numerical model on two dimensional Euclidean space, the authors worked out the fractal dimension values and the stability levels of all kinds of wetland resources. The dynamic changes of wetland resources in the study area was finally obtained according to the physical meaning of fractal dimension and the level of stability. The results of the study indicate that marshes and lakes constitute the most key elements and also the most unstable wetland elements in wetland environments. It has been proved in practice that fractal theory has ample application scope in the study of wetland dynamic change. The fractal dimension and the level of stability can supply the decision-making basis for the appraisal of wetland environments and the sustainable utilization of wetland resources.
出处
《国土资源遥感》
CSCD
2004年第3期42-45,共4页
Remote Sensing for Land & Resources
基金
北京市重点实验室开放基金项目
北京市自然科学基金项目(200000511)
北京市自然科学基金项目(6032003)。
关键词
野鸭湖
湿地
多源遥感影像融合
叠置分析
分形维数
稳定性指数
Wild duck lake
Wetland
Data fusion in multi-sources remotely sensed imagery
Superposition analysis
Fractal dimension
Level of stability.
