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  • 软件名称:重庆地表温度的遥感反演及其空间分异特征
  • 软件大小: 0.00 B
  • 软件评级: ★★★
  • 开 发 商: 李军, 龚围, 辛晓洲, 高阳华
  • 软件来源: 《遥感技术与应用》
  • 解压密码:www.gissky.net

资源简介

摘要: 地表温度是地表能量平衡研究的重要参数之一,为了提高重庆主城区夏季高湿热条件下地表温度的反演精度,结合MODTRAN模型与MERRA大气廓线数据,修正了大气透过率估算方程,基于2013年夏季Landsat 8 TIRS第10波段数据和单窗算法,分别利用修正前后的大气透过率反演了地表温度,并将结果与0 cm土壤表层温度观测数据进行了对比,最后,分析了地表温度随地形和土地覆被的空间分异特征。结果表明:①修正后的大气透过率较显著提高了地表温度的反演精度,平均绝对误差从4.89 K减少至1.73 K;②地表温度具有显著的地形分异特征,和海拔之间的相关系数为-0.542 6(极显著相关),垂直递减率约为1.17 K/100 m,随坡度增加而降低,且随不同坡向也存在较明显差异,平缓坡>阳坡>半阳坡>半阴坡>阴坡,平缓坡和阴坡之间相差约2.40 K;此外,和地形遮蔽之间的相关系数为0.217 2(极显著相关),随着地形遮蔽的减弱而升高;③不同土地覆盖类型的地表温度之间差异显著,城镇的平均地表温度最高,湿地的最低,其他类型之间则相差较小。 关键词: 单窗算法;  地表温度;  大气参数;  Landsat 8;  MERRA     Abstract: Land Surface Temperature(LST)is an important parameter in land surface energy budget.In order to improve the accuracy of LST retrieval by remote sensing methods in summer in urban districts of Chongqing with hot and humid atmosphere condition.an improved methodology was presented with the improved atmospheric transmittance estimated on MODTRAN software using the atmospheric profile data of MERRA in urban districts of Chongqing.LST was retrieved from Landsat 8 TIRS band 10 data using single-window algorithm which apply the improved and unimproved atmospheric transmittance respectively.Then the retrieved LST was compared with the 0 cm soil temperatures observedby 4 meteorological stations.Finally,the spatial heterogeneity of LST was analyzed.The result indicated that:(1)The scheme proposed in this paper can improve LST retrieval in summer in urban districts of Chongqing.The Mean Absolute Error(MAE)decrease from 4.89 K to 1.73 K.(2)The retrieved LST has spatial heterogeneity with different terrain factors.Its lapse rate is about 1.17 K/100 m.It decreases with the increase of slope.Moreover,it has obvious differences with aspect.The flat slope>sunny slope>semi-sunny slope>semi-shady slope>shady slope.There also existed highly significant correlation between the LST and hill shade.The LST increases with the decrease of hill shade.(3)Influenced by land cover,the spatial distribution of LST showed significant differences.The average LST inthe built\|up area is highest,while the wet land is lowest.The difference of average LST in other land cover types is little.

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