| 多时相遥感影像福州市热场与土地覆盖分析 |
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| 引用本文： | 张友水,韩春峰,伍雄昌,余珊.多时相遥感影像福州市热场与土地覆盖分析[J].资源科学,2011,33(5):950-957. |
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| 作者姓名： | 张友水 韩春峰 伍雄昌 余珊 |
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| 作者单位： | 福建师范大学地理科学学院,福州,350007 |
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| 基金项目： | 福建省科技厅项目（编号：2009J0102）。 |
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| 摘 要： | 城市化是全球变暖和城市热岛效应的重要影响因素,影响着区域气候、环境和社会经济发展。本研究采用两个不同季相TM/ETM+影像分析福州市及其周边地区土地覆盖及其热场的时空分布。为了精确获取土地覆盖信息,采用高分辨率影像提取不透水面并获取不透水面面积百分比信息,计算各级不透水面百分比的地表温度、归一化植被指数与归一化建设用地指数的平均值。通过各级平均值定量分析归一化植被指数、归一化建设用地指数、不透水面百分比与地表温度的关系,并计算各级不透水面对区域地表温度的贡献。分析结果显示:归一化建设用地指数,不透水面百分比与地表温度的相关指数分别>0.61和>0.67,明显高于归一化植被指数与地表温度的相关指数(<0.3);不同时相影像的相关性不同且夏季影像的相关性明显高于春季影像。研究表明本方法能够定量分析城市土地覆盖与热场的时空分布与变化。
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| 关 键 词： | 地表温度 不透水面 归一化植被指数 归一化建设用地指数 福州市 |
| 收稿时间： | 9/7/2010 12:00:00 AM |
Analysis of Land Cover and Urban Thermal Characteristics for Fuzhou Using Multi-Temporal Satellite Data |
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| ZHANG Youshui,HAN Chunfeng,WU Xiongchang and YU Shan.Analysis of Land Cover and Urban Thermal Characteristics for Fuzhou Using Multi-Temporal Satellite Data[J].Resources Science,2011,33(5):950-957. |
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| Authors: | ZHANG Youshui HAN Chunfeng WU Xiongchang and YU Shan |
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| Institution: | College of Geography, Fujian Normal University, Fuzhou 350007, China;College of Geography, Fujian Normal University, Fuzhou 350007, China;College of Geography, Fujian Normal University, Fuzhou 350007, China;College of Geography, Fujian Normal University, Fuzhou 350007, China |
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| Abstract: | Urbanization has become an important contributor to global warming and resulted in a remarkable urban heat island (UHI) effect, which influences regional climate, the environment, and socio-economic development. In this study, Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) images acquired on different dates from 1989 and 2001 were jointly utilized to assess urban area thermal characteristics in Fuzhou. As a key indicator in assessing urban environments, subpixel impervious surface area (ISA) was mapped to quantify urban land use extents and urban surface thermal patterns. In order to accurately estimate urban surface types, the high-resolution imagery was utilized to generate ISA to characterize urban land use/cover (LULC) at resolutions of smaller than 30 m and further the percent ISA with 30 m resolution were calculated. The urban development densities were defined by the ISA threshold values used in our analysis: 10-30% for low-density; 31-50% for medium-density; and >50% for high-density. The Normalized Difference Vegetation Index (NDVI) index and the Normalized Difference Build-up (NDBI) index which are sensitive to the built-up area were also used to characterize the LULC types and to analyze the relationships between LULC types and UHI quantitatively. Urban thermal characteristics were analyzed by investigating the relationships between mean values of land surface temperature (LST), percent impervious surface area (ISA), and two indices, NDVI and NDBI. Our analysis showed that the correlations between the mean values of NDVI and LST were negative and much less strong, with relevant indices of NDVI and LST derived from remote sensing images in 1989 and 2001 being less than 0.3. However, positive correlations were shown between the mean values of percent ISA, NDBI, and LST, and there were strong linear relationships between NDBI, percent ISA, and LST. The relevant indices of two periods of remote sensing images were more than 0.61 and more than 0.67, respectively. The analysis showed that the correlation indices in summer were significantly higher than those in spring. The mean LST and associated standard deviation for percent ISA in Fuzhou, and the contribution of temperature for each ISA category to regional LST were also estimated. Results suggest that percent ISA, together with LST, NDVI and NDBI, can quantitatively describe the spatial distribution and temporal variation in urban thermal patterns and associated LULC types. This study may provide urban planers and environmental managers with useful information on assessing and monitoring urban thermal environments as a result of urbanization. |
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| Keywords: | Land surface temperature Impervious surface area NDVI NDBI |
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