| Summary: | 碩士 === 國立成功大學 === 建築學系 === 104 === Urban heat island effect has a strong impact on urban thermal environment and thermal comfort of humans. Although satellite remote sensing can easily show the information of thermal distribution in a large area, there is still lack of accuracy and fast approach to estimate the complex characteristic of the distribution of radiation in urban areas due to the low resolution images of conventional satellite remote sensing and the lack of the information about the vertical surfaces. In order to solve this important issue, the research presents an innovative approach by using the high resolution airborne LiDAR technology combined with thermal infrared remote sensing, and conducting surface measurement simultaneously to observe the urban thermal environment. The Banqiao district in New Taipei City , which is high development, is selected as an survey area. In terms of aerial survey, airborne LiDAR sensors can be used to create a DSM (Digital Surface Model) in high resolution 1m×1m per pixel with scanning imaging technique, so that the building heights, building area, form of planting, and tree crown can be obtained. By combining the three kinds of information through the latitude and longitude, the mean radiant temperature (Tmrt) can be calculated and compared.
According to the analysis result, the Tmrt estimated by data from thermal imager and LiDAR was compared to the data from ground survey and show high accuracy. Presenting Tmrt and physiologically equivalent temperature (PET) of Banqiao district in the form of maps is useful for identifying hotspots in the city. In addition, the energy use estimated by combination of LiDAR and land use properties have a high correlation to the actual values. Therefore, thermal infrared remote sensing combined with LIDAR technology can improve the accuracy and the understanding of urban bioclimatic conditions in urban thermal environment. of great potential for further development.
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