基于Worldview-2的乌鲁木齐城区绿地空间格局分析

Analysis of Green Space Landscape Pattern in Urumqi Based on Worldview-2

以乌鲁木齐2010年Worldview-2高分辨率遥感影像为基础,运用面向对象式分类软件Feature Analyst,对乌鲁木齐城区绿地信息进行提取和空间格局分析。绿地信息提取结果与传统的遥感监督分类相比较,分类精度明显提高,可以作为城市绿地分析的依据。分析表明:乌鲁木齐市城区绿地斑块面积为5 360.05 hm2,斑块数量40 048块,绿化覆盖度为30.66%;单位附属绿地占城市绿地的主导地位;城市绿地破碎化程度高,绿地斑块面积大小分布不太均匀,未能形成良好的连通性,在未来的绿地建设中需有针对性的改进。

Urban green space is the integrated embodiment of its natural landscape and human landscape,is also an important part of urban ecosystem,and plays an important role in improving the urban environment and maintaining the urban biodiversity and balancing urban ecological system. In this paper,green space information of Urumqi urban area were extracted and analyzed by using object-oriented analysis software Feature Analyst based on the Worldview-2 high resolution remote sensing image of Urumqi in 2010. Compare to the traditional remote sensing supervised classification,the object-oriented classification result was improved significantly and it could be taken as the basis of urban green space analysis effectively. The result was as follows： the green space patch area of Urumqi city was about 5 360. 05 hm^2,the number of patches was about 40 048 and the percentage of greenery coverage was about 30. 66%; the dominance of the urban green space was the affiliated green space,the area of road green space was minimum in the green space types; the degree of fragmentation was high,the distribution of green patch size was not even,which meant that the whole city was failed to form a good connectivity. In the future green space planning,the construction of road green space should be paid more attention. Secondly,the greening of barren hills and unused land should be increased. Meanwhile,the existing achievement of urban green space must be protected and it was necessary to strengthen the green landscape structure,improve the quality of green space and perfect the layout of green space.