热辐射方向性对遥感评估城乡热环境差异的定量影响研究

Remote sensing technology is an important and hot means to study thermal environment. Directionality is the universal characteristic of obtaining information by remote sensing. However, current research on urban and rural thermal environment based on remote sensing seldom considers directional characteristics, which will have a significant impact on the accurate assessment of urban and rural thermal environment differences. This project will conduct an in-depth study on the impact of thermal radiation directivity on the assessment of the differences between urban and rural thermal environment, and make quantitative analysis of this effect by means of site experiment observation combined with remote sensing observation. This study will select observed sites (concrete, grass and bare soil) in the city center of Hefei and the surrounding countryside field to carry out the experiment, analysis the thermal radiation directionality characteristic of these typical urban and rural areas and proposed an evaluation method of urban and rural thermal environment differences eliminating the effect of the directionality. Compared with the results of urban and rural thermal environment differences based on single angle by remote sensing observation, the influence of directionality are clearly defined. Then, the influence mechanism and influence degree of thermal radiation directivity on the difference between urban and rural thermal environment were investigated, and a relatively perfect method was put forward to evaluate the difference of urban and rural thermal environment.

遥感技术是研究热环境的重要和热点手段，方向性是遥感手段获取信息的普遍特征。然而，目前基于遥感的城乡热环境研究很少考虑方向性特征，这将对准确评估城乡热环境差异产生重要影响。本项目将针对热辐射方向性对评估城乡热环境差异的影响进行深入研究，通过站点实验观测结合遥感观测手段对这一影响进行定量分析。本研究将选取合肥市建成区的水泥地表和周边乡村较平整的草地与裸土开展观测实验，分析城乡典型地表上的热辐射方向性特征，提出消除这一方向性影响的城乡热环境差异评估的方法。并将基于观测数据消除方向性影响后的城乡热环境差异评估结果与基于单一角度遥感观测的评估结果进行对比分析，明确方向性的定量影响。进而探明热辐射方向性对评估城乡热环境差异的影响机制及影响程度，提出相对完善的评估城乡热环境差异的方法。

遥感技术是研究热环境的重要和热点手段，方向性是遥感手段获取信息的普遍特征。然而，目前基于遥感的城乡热环境研究很少考虑方向性特征，这将对准确评估城乡热环境差异产生重要影响。本项目针对热辐射方向性对评估城乡热环境差异的影响进行深入研究，通过站点实验观测结合遥感观测手段对这一影响进行定量分析。本研究选取合肥市及周边郊区作为研究区，将消除方向性影响后的城乡热环境差异评估结果与基于单一角度遥感观测的评估结果进行对比分析，确定了方向性的定量影响。