绿地景观热环境效应的遥感研究

利用快鸟影像提取绵阳市绿地斑块,TM影像反演地表温度。根据Kriging算法绘制等温线,以等温线分布图为基础精确确定降温边界、降温范围及边界温度,并对绿地斑块平均温度与面积、周长等指标的关系进行回归分析。研究结果显示:斑块平均温度与其面积、周长、形状指数无相关性,与植被覆盖度存在显著负相关关系,确定性系数超过0.5;每个斑块空间降温效果差异显著,等温线密集的地方降温速度快,稀疏的地方降温速度慢;统计降温边界温度、降温幅度和降温范围3个指标,降温边界温度最大值与最小值相差2.6℃;降温幅度集中在0.5~1.5℃之间,平均降温幅度值为0.97℃;最大降温范围值为113m,最小值为15m,平均值为60m。降温范围、降温幅度与面积、周长等指标无显著相关性。

Study on the thermal environment effect of green landscape using remote sensing technology

Quick Bird was used to acquire the green land patches of Mianyang city,and TM image was used to retrieve the land surface temperature.The author drew isotherm by Kriging,and took isotherm distributions to confirm cooling boundary,cooling range and boundary temperature,the relationship between urban green land patches' average temperature with area,perimeter and shape index were analyzed.The studies show that,urban green land patches' average temperature had no significant correlation with area,perimeter and shape index,but it had negative relevant correlation with FVC,and the certainty factor was greater than 0.5.Also cooling effect of green patches was different in space,the temperature decreased faster in concentrated isotherm than sparse.Anymore,the author counted temperature of cooling boundary,cooling effect,cooling range,the difference temperature of cooling boundary between the maximum value and minimum value was 2.6 ℃,cooling effect were from 0.5 ℃ to 1.5 ℃,and the average cooling rate was 0.97 ℃.The maximum cooling range was 113 m,the minimum value was 15 m,and the average value was 60 m.Indexes such as patches' area,perimeter had no significant correlation with cooling range and cooling effect.