不透水面产品在重庆地区的验证

Validation of Impervious Surface Products in Chongqing

以国家地球系统科学数据中心发布的不透水面数据产品为基础,利用地理国情数据中地表覆盖分类提取的不透水面成果进行重庆地区精度验证,并与兴趣点数据(Point of Interest,POI)、夜间灯光数据进行相关性和空间重叠度分析。结果表明:不透水面产品在重庆地区验证情况较好,不透水面产品与地理国情不透水面耦合性较高,能够较为准确地反映城市建设状况,全市不透水面产品有71.61%以上位于地理国情不透水面范围内;不透水面产品面积与POI核密度、夜间灯光亮度具有正相关性,但相关系数不高,且空间分布具有一定差异。通过不透水面产品在重庆地区验证分析,能够对未来不透水面提取优化研究提供基础支撑。

The impervious surface data from Geographical Condition Surveywereapplied to validate the Impervious Surface Products released by the National Earth System Science Data Center and the relationships and spatial overlay features between Impervious Surface Products and POI data,Nighttime Lights data were analyzed.The result showed,the validation seemed good,the Impervious Surface Products had high coupling with impervious surface data from Geographical Condition Survey which could reflect characteristics of urban construction well.More than 71.61%of the Impervious Surface Products were located within the impervious surface data from Geographical Condition Survey was 71.61%.Impervious Surface Products had positive correlation with Kernel density of POI data and Nighttime Lights data,but the correlation was not highly enough with different distribution features.The validation analysis of Impervious Surface Product in Chongqing could provide basic support for future impervious surface extraction and optimization and urban planning and construction.