地球信息科学学报
地毬信息科學學報
지구신식과학학보
GEO-INFORMATION SCIENCE
2014年
3期
490-498
,共9页
线性光谱分解%不透水面%地表温度%景观指数%福州市
線性光譜分解%不透水麵%地錶溫度%景觀指數%福州市
선성광보분해%불투수면%지표온도%경관지수%복주시
linear spectral mixture analysis%impervious surface area%land surface temperature%landscape met-rics%Fuzhou City
城市化致使城市环境问题的产生，城市热环境问题就是其中之一。本文从不透水面方面研究对城市热环境的影响。根据福州市1989年和2001年Landsat TM/ETM+遥感影像数据，利用线性光谱分解法提取两时相不透水面信息，并离散化分级为中低、中、中高、高密度区4个区域，分别计算这4个区域的地表温度（LST）、归一化植被指数（NDVI），并进行相关性分析；根据阈值法和范围法分别计算不透水面的PD、AI、LPI等景观指数，结果表明：两时段内不透水面的面积有所增加，在高密度区增加明显；不透水面与地表温度的呈正相关，相关系数分别为0.66和0.71；不透水面景观指数对FISA敏感，景观指数整体的变化趋势与地表温度的变化趋势相一致，FISA值越大，温度越高，且各斑块的形状越来越复杂，空间的连续性越强；聚集度越高，人类活动也越强。
城市化緻使城市環境問題的產生，城市熱環境問題就是其中之一。本文從不透水麵方麵研究對城市熱環境的影響。根據福州市1989年和2001年Landsat TM/ETM+遙感影像數據，利用線性光譜分解法提取兩時相不透水麵信息，併離散化分級為中低、中、中高、高密度區4箇區域，分彆計算這4箇區域的地錶溫度（LST）、歸一化植被指數（NDVI），併進行相關性分析；根據閾值法和範圍法分彆計算不透水麵的PD、AI、LPI等景觀指數，結果錶明：兩時段內不透水麵的麵積有所增加，在高密度區增加明顯；不透水麵與地錶溫度的呈正相關，相關繫數分彆為0.66和0.71；不透水麵景觀指數對FISA敏感，景觀指數整體的變化趨勢與地錶溫度的變化趨勢相一緻，FISA值越大，溫度越高，且各斑塊的形狀越來越複雜，空間的連續性越彊；聚集度越高，人類活動也越彊。
성시화치사성시배경문제적산생，성시열배경문제취시기중지일。본문종불투수면방면연구대성시열배경적영향。근거복주시1989년화2001년Landsat TM/ETM+요감영상수거，이용선성광보분해법제취량시상불투수면신식，병리산화분급위중저、중、중고、고밀도구4개구역，분별계산저4개구역적지표온도（LST）、귀일화식피지수（NDVI），병진행상관성분석；근거역치법화범위법분별계산불투수면적PD、AI、LPI등경관지수，결과표명：량시단내불투수면적면적유소증가，재고밀도구증가명현；불투수면여지표온도적정정상관，상관계수분별위0.66화0.71；불투수면경관지수대FISA민감，경관지수정체적변화추세여지표온도적변화추세상일치，FISA치월대，온도월고，차각반괴적형상월래월복잡，공간적련속성월강；취집도월고，인류활동야월강。
With the economic development, urbanization has been accelerating in recent years in Fuzhou City, Fujian Province of China. Rapid change on land surface property and its patterns may lead to change of thermal properties in urban areas of Fuzhou City. One of the main impacts of rapid urbanization is the effect of urban thermal environment. Landscape patches in a region are different in size, shape and spatial arrangements, which contribute to the spatial heterogeneity of landscape and are linked to the distinct behaviour of urban thermal envi-ronments. Studies on landscape metrics extracted from discretized percent impervious surface area data are com-paratively rare. This research, which investigated the relationship of landscape metrics and urban thermal envi-ronments in Fuzhou City, Fujian Province, China, is based on both the analysis of land surface temperature (LST) in relation to normalized difference vegetation index (NDVI), and the percent impervious surface area (FI-SA). Two Landsat TM/ETM+images acquired on June 15 1989 and March 4, 2001 were used to estimate LST, NDVI, and impervious surface area (ISA). This was extracted by applying linear spectral mixture analysis. We analyzed the relationship between the above-mentioned components of urban ecosystem. Using threshold value method and range method to discretize percent ISA into different categories. Landscape metrics such as cohe-sion, AI, LPI, etc. are calculated based on different FISA categories. The result showed that there is a positive lin-ear relationship between LST and impervious surface over the region. The correlation coefficient is .66(1989) and .71(2001). To find the relationship between landscape metrics and LST, we analyzed landscape metrics from three aspects:shape, area and structure. The study indicated that landscape metrics are sensitive to the variation of FISA and LST. Therefore, the integration of FISA and landscape metrics provided a feasible way to describe the spatial distribution and temporal variation in urban thermal patterns in a quantitative manner.
