Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data
Ten cities with different population and urban sizes located in the Pearl River Delta, Guangdong Province, P.R. China were selected to study the relationships between the spatial extent of surface urban heat islands (SUHI) and five urban characteristic factors such as urban size, development area, w...
Main Authors: | , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2008-11-01
|
Series: | Sensors |
Subjects: | |
Online Access: | http://www.mdpi.com/1424-8220/8/11/7453/ |
id |
doaj-9ef51eae34234a139b60500d3dbd3c1e |
---|---|
record_format |
Article |
spelling |
doaj-9ef51eae34234a139b60500d3dbd3c1e2020-11-25T02:33:35ZengMDPI AGSensors1424-82202008-11-018117453746810.3390/s8117453Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ DataJinqu ZhangYunpeng WangTen cities with different population and urban sizes located in the Pearl River Delta, Guangdong Province, P.R. China were selected to study the relationships between the spatial extent of surface urban heat islands (SUHI) and five urban characteristic factors such as urban size, development area, water proportion, mean NDVI (Normalized Vegetation Index) and population density, etc. The spatial extent of SUHI was quantified by using the hot island area (HIA). All the cities are almost at the same latitude, showing similar climate and solar radiation, the influence of which could thus be eliminated during our computation and comparative study. The land surface temperatures (LST) were retrieved from the data of Landsat 7 Enhanced Thematic Mapper Plus (ETM+) band 6 using a mono-window algorithm. A variance-segmenting method was proposed to compute HIA for each city from the retrieved LST. Factors like urban size, development area and water proportion were extracted directly from the classification images of the same ETM+ data and the population density factor is from the official census. Correlation and regression analyses were performed to study the relationships between the HIA and the related factors, and the results show that HIA is highly correlated to urban size (r=0.95), population density (r=0.97) and development area (r=0.83) in this area. It was also proved that a weak negative correlation existed between HIA and both mean NDVI and water proportion for each city. Linear functions between HIA and its related factors were established, respectively. The HIA can reflect the spatial extent and magnitude of the surface urban heat island effect, and can be used as reference in the urban planning.http://www.mdpi.com/1424-8220/8/11/7453/Enhanced Thematic Mapper plus (ETM+)Surface urban heat island (SUHI)Land surface temperature (LST)Variance segmentingThermal infrared imageHot island area |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jinqu Zhang Yunpeng Wang |
spellingShingle |
Jinqu Zhang Yunpeng Wang Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data Sensors Enhanced Thematic Mapper plus (ETM+) Surface urban heat island (SUHI) Land surface temperature (LST) Variance segmenting Thermal infrared image Hot island area |
author_facet |
Jinqu Zhang Yunpeng Wang |
author_sort |
Jinqu Zhang |
title |
Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data |
title_short |
Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data |
title_full |
Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data |
title_fullStr |
Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data |
title_full_unstemmed |
Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data |
title_sort |
study of the relationships between the spatial extent of surface urban heat islands and urban characteristic factors based on landsat etm+ data |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2008-11-01 |
description |
Ten cities with different population and urban sizes located in the Pearl River Delta, Guangdong Province, P.R. China were selected to study the relationships between the spatial extent of surface urban heat islands (SUHI) and five urban characteristic factors such as urban size, development area, water proportion, mean NDVI (Normalized Vegetation Index) and population density, etc. The spatial extent of SUHI was quantified by using the hot island area (HIA). All the cities are almost at the same latitude, showing similar climate and solar radiation, the influence of which could thus be eliminated during our computation and comparative study. The land surface temperatures (LST) were retrieved from the data of Landsat 7 Enhanced Thematic Mapper Plus (ETM+) band 6 using a mono-window algorithm. A variance-segmenting method was proposed to compute HIA for each city from the retrieved LST. Factors like urban size, development area and water proportion were extracted directly from the classification images of the same ETM+ data and the population density factor is from the official census. Correlation and regression analyses were performed to study the relationships between the HIA and the related factors, and the results show that HIA is highly correlated to urban size (r=0.95), population density (r=0.97) and development area (r=0.83) in this area. It was also proved that a weak negative correlation existed between HIA and both mean NDVI and water proportion for each city. Linear functions between HIA and its related factors were established, respectively. The HIA can reflect the spatial extent and magnitude of the surface urban heat island effect, and can be used as reference in the urban planning. |
topic |
Enhanced Thematic Mapper plus (ETM+) Surface urban heat island (SUHI) Land surface temperature (LST) Variance segmenting Thermal infrared image Hot island area |
url |
http://www.mdpi.com/1424-8220/8/11/7453/ |
work_keys_str_mv |
AT jinquzhang studyoftherelationshipsbetweenthespatialextentofsurfaceurbanheatislandsandurbancharacteristicfactorsbasedonlandsatetmdata AT yunpengwang studyoftherelationshipsbetweenthespatialextentofsurfaceurbanheatislandsandurbancharacteristicfactorsbasedonlandsatetmdata |
_version_ |
1724812982510157824 |