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温度反演(地表温度反演)

地表温度反演在科研领域有着较为广泛的应用,其对于城市热岛效应、林火监测、旱灾监测等方面都有着极大的作用和价值。什么叫温度反演?即不直接接触所需要测量的点,通过其他与之相关点的温度反演得出所需测量点的准确温度。理解路面温度遥感反演面临的问题。陆地表面温度反演的方法是什么?

为什么需要进行地表温度反演实验

温度反演(地表温度反演)

地表温度反演在科研领域有着较为广泛的应用,其对于城市热岛效应、林火监测、旱灾监测等方面都有着极大的作用和价值。

什么叫温度反演?

以电缆温度反演设备来举例说明:电缆缆芯温升反演监测系统基于电磁-温度多物理场反演检测方法,利用电缆表皮温度和电流实现电缆内部导体温度的非植入式智能检测,能够克服负荷电流波动、环境因素干扰、接头材料及结构分散性大的等难点。即不直接接触所需要测量的点,通过其他与之相关点的温度反演得出所需测量点的准确温度。

怎么理解路面温度遥感反演面临的问题

理解路面温度遥感反演面临的问题。

1、非同温混合象元占绝大多数,对这样的象元而言,定义象元的有效平均温度也比较困难,关于这类非同温混合象元的陆面温度遥感问题需要专门讨论。

2、纯象元陆面温度的遥感问题,由于陆面目标的比辐射率明显小于1,需要考虑大气下行辐射的贡献与干扰。

3、地表温度的皮肤效应地表30cm温度廓线,在地表下的一定距离,温度趋于稳定。

陆地表面温度反演的方法是什么?

利用分裂窗算法反演陆地表面温度的研究进展

PROGRESS IN SPLIT-WINDOW ALGORITHMS FOR RETRIEVING LAND SURFACE TEMPERATURE

俞宏 石汉青

摘 要:本文对LST反演的分裂窗算法作了回顾和比较.LST反演的分裂窗算法最一般的形式是TS=T4+A(T4-T5)+B,其中TS是陆地表面温度,T4和T5分别是AVHRR分裂窗通道4和5的亮温度,A和B是由大气、观测角及地表辐射率所决定的系数,不同的算法其系数的确定有很大的不同.地表比辐射率的确定是LST反演中的主要难点,目前也有多种方法来确定地表比辐射率值.最后本文还指出了目前在LST反演中存在的局限性.

关键词:分裂窗算法 反演 陆地表面温度

分类号:S165 文献标识码:A

作者单位:俞宏(解放军理工大学气象学院,南京,211101)

石汉青(解放军理工大学气象学院,南京,211101)

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地表反演温度能有50多度吗

温度一般在46-50之间少量地区在53摄氏度左右

地表温度作为地球环境分析的重要指标,而遥感技术作为现代重要的对地观测手段,使得基于遥感图像的地表温度反演的研究越来越多。主要的地表温度反演方法有:大气校正法,单窗算法,单通道法等等。本文介绍用辐射传输方程法对地表温度进行反演。

地表温度反演利用的是什么方法,有哪些优缺点

地温的获取主要是依赖于遥感反演的方法,通过多种反演算法的精度比较,其中Landsat

TM/ETM与环境小卫星最后单窗算法,Modis采用的是劈窗算法,而AVHRR采用分裂窗算法,并在此种算法的基础之上加入了经验拟合的修正。误差主要是对低空空气温度的估算上,分析得到地温空间分布规律与实际的分布特征有着很强的一致性,基本在0.4之内,与国内外专家的参考文献为验证基础,并进行了相关的野外验证,数据空间一致性良好,可实现各部门应用。

◆TM/ETM与环境小卫星算法如公式(1):

TS=[a×(1-C-D)+(b×(1-C-D)+C+D)×T6-D×Ta] ………(1)

式中,Ts为地表温度,a和b为经验系数(a=-67.35535,b=0.458608),T6为TM6的亮度温度(K),Ta为大气平均作用温度(K),C和D为中间参数。

关于Modis算法如公式和AVHRR算法如公式可查看里面有详细介绍各个公式的使用情况。