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基于ASTER数据的城西湿地降温效应研究

时间:2020-06-21 22:05来源:毕业论文
以杭州城西地区为例,基于Aster多光谱数据完成研究区土地利用类型的遥感信息提取,利用土地利用分类数据和地表温度数据,采用分级、剖面和抽样等技术手段,完成杭州城西区域地表

摘要区域土地的利用方式的改变是导致城市热环境效应的主要影响因子, 从土地利用的角度来研究热环境效应是解决城市环境问题的关键。本研究以杭州城西地区为例,基于Aster多光谱数据完成研究区土地利用类型的遥感信息提取,利用土地利用分类数据和地表温度数据,采用分级、剖面和抽样等技术手段,完成杭州城西区域地表温度信息空间格局分析及驱动机制分析。结果表明:(1)研究区地表温度分级明显,中温区所在比例最大,高温区破碎度较高;热力景观从郊区到城镇体现了由低温区、次中温区向中温区、次高温区、高温区过渡的趋势。(2)区域内城市和村镇区域地表温度为高-高集聚,山地林区表现为低-低集聚,农田区域和部分绿地为集聚不明显,高-低集聚和低-高集聚区域多为城镇与周边农田、绿地、水体的交接地带。(3)城镇用地表温度远远高于裸地用地和以农田为主的区域,存在明显的热岛效应。城市不同土地利用类型的地表温度差异较大, 其中水域平均地表温度最低,城镇用地最高。整体趋势为,城镇用地> 裸地> 农田> 绿地> 水体。51491

Abstract Considering that changes of regional land use pattern has played quite an important role in urban thermal environment effects, exploring the mechanism of thermal environment effects from the perspective of land use is the key to urban thermal environment problem research. In this study, taking Western Hangzhou as an example, the land use information was extracted by the method of supervised classification based ASTER Data, which would lay the foundation for the analysis on thermal environment effect of land use patterns in the further research. Based on the land use classification data and land surface temperature data, by means of hierarchical clustering, cross sectioning, sampling and other technical, the pattern and influencing factors of land surface temperature in Western Hangzhou was analyzed. The results showed that, (1) The middle temperature region is the most prevalent, and thermal landscape fragmentation was highest in high temperature region. Meanwhile, the thermal landscape distributions in the areas have moved from the suburb to the downtown. The evolution trend of the thermal landscape is changed from the low temperature region,sub-middle temperature region to middle temperature region,sub-high temperature region and high temperature region. (2) The high-high temperature zone located in the urban and town areas, the low-low temperature region located in the nearby mountains and forests region, the temperature agglomeration phenomenon in the farmland and parts of green land area is not significant; (3) There is a marked heat island effect in the built-up area. Land surface temperatures for different kinds of land use had obvious discrepancies, with higher land surface temperature for urban and town areas, and lower temperature for farmland and water. The descending order of the mean land surface temperature for different kinds of land use type was: built-up areas, bare land, farmland, green space, and waters.

毕业论文关键词:土地利用方式;地表温度;热环境效应;城市化

Keywords: Land use patterns; Surface temperature; Thermal environment effect; Urbanization

目    录

1.引言 4

1.1国内外研究进展 5

1.2主要研究内容 7

1.3论文整体技术方案 7

2.研究区域概况 8

3.数据与方法 9

3.1数据获取 9

3.2土地利用遥感信息提取 11

3.3地表温度信息提取 基于ASTER数据的城西湿地降温效应研究:http://www.lwfree.com/shuxue/lunwen_55127.html

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