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Downscaling Thermal Infrared Radiance for Subpixel Land Surface Temperature Retrieval

机译:缩小尺度的热红外辐射用于亚像素陆地表面温度检索

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摘要

Land surface temperature (LST) retrieved from satellite thermal sensors often consists of mixed temperature components. Retrieving subpixel LST is therefore needed in various environmental and ecological studies. In this paper, we developed two methods for downscaling coarse resolution thermal infrared (TIR) radiance for the purpose of subpixel temperature retrieval. The first method was developed on the basis of a scale-invariant physical model on TIR radiance. The second method was based on a statistical relationship between TIR radiance and land cover fraction at high spatial resolution. The two methods were applied to downscale simulated 990-m ASTER TIR data to 90-m resolution. When validated against the original 90-m ASTER TIR data, the results revealed that both downscaling methods were successful in capturing the general patterns of the original data and resolving considerable spatial details. Further quantitative assessments indicated a strong agreement between the true values and the estimated values by both methods.
机译:从卫星热传感器获取的地表温度(LST)通常由混合温度分量组成。因此,在各种环境和生态研究中都需要检索子像素LST。在本文中,我们开发了两种方法来缩小粗分辨率热红外(TIR)辐射的比例,以实现子像素温度检索。第一种方法是在TIR辐射的尺度不变物理模型的基础上开发的。第二种方法基于高空间分辨率下TIR辐射与土地覆盖率之间的统计关系。将这两种方法应用于将模拟的990 m ASTER TIR数据缩减为90 m分辨率。当针对原始的90米ASTER TIR数据进行验证时,结果表明,两种缩小比例的方法均能成功捕获原始数据的一般模式并解决大量空间细节。进一步的定量评估表明,两种方法的真实值和估计值之间有很强的一致性。

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