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| 昆明市主城区地表温度格局演变与等级转换特征分析 |
| Analysis on Pattern Evolution and Grade Transition Characteristics of Land Surface Temperature in the Main Urban Area of Kunming |
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| DOI： |
| 中文关键词: 地表温度等级 兴趣点 核密度等级分区 综合转换动态度 昆明市 |
| 英文关键词: Land surface temperature grades Point of interest Kernel density grade zoning Comprehensive transition dynamic degree Kunming |
| 基金项目:国家自然科学基金资助项目（41761081）；云南省社科规划办重点基金资助项目（ZD202218） |
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| 中文摘要: |
| 基于2004—2023年昆明主城区5期Landsat影像反演地表温度，以均值〖CD*2〗标准差划分地表温度等级，根据核密度值将研究区分为高、中、低3级圈层，分析地表温度的空间分布、演变趋势、转换特征，根据转换路径将研究区分为不同区域。结果表明：2004—2023年高温区面积总体增幅为4053%，呈现沿“东北〖CD*2〗西南”方向中心聚集的趋势，低温区呈现沿“东北〖CD*2〗西南”方向外扩散的趋势。地表温度等级向中温区的转换最为活跃，是主导转换类型，低核密度区是地表温度等级动态转换的主要发生区域，综合转换动态度达0748。3级核密度区的地表温度平衡区面积占比为4990%，加剧区面积为792544 km2，优化区面积为848207 km2，优化区环绕核心城区外围分布，高、中核密度区加剧区面积大于优化区，低核密度区优化区面积大于加剧区，植被覆盖区是地表热环境优化的主要发生区域，建设用地是地表热环境加剧的主要发生区域。 |
| 英文摘要: |
| The land surface temperature was retrieved based on five phases of Landsat images in the main urban area of Kunming from 2004 to 2023， and the land surface temperature grades were classified by mean standard deviation. The study area was divided into high， medium and low temperature zones according to kernel density. The spatial distribution， evolution trend and transition characteristics of land surface temperature were analyzed. The study area was divided into different zones based on transition paths. The results indicated that from 2004 to 2023， the area of high temperature zone increased by 40.53% overall， showing a trend of aggregation toward the center along the “northeast southwest” direction， while the low temperature zone showed a trend of outward diffusion along the “northeast southwest” direction. The transition of land surface temperature grades to medium temperature zone was the most active and dominant transition type. The dynamic transition of land surface temperature grades mainly occurred in the low kernel density region， with a comprehensive transition dynamic degree of 0.748. In the three levels of kernel density regions， the area of land surface temperature equilibrium zone accounted for 49.90%， and the areas of the intensification zone and the optimization zone were 792.544 km2 and 848.207 km2， respectively. The optimization zone was distributed around the periphery of the core urban area. In high and medium kernel density regions， the area of the intensification zone was larger than that of the optimization zone. In low kernel density region， the area of optimization zone was larger than that of the intensification zone. The optimization of the surface thermal environment mainlyoccurred in vegetation covered areas， while the in〖HK〗ten〖HK〗sification of the surface thermal environment primarily took place in construction land. |
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