A scaling approach for satellite-derived land surface temperature over terrain area
A scaling approach for satellite-derived land surface temperature over terrain area
复制标题
地形区域卫星衍生地表温度的缩放方法
DOI：
10.1117/12.626990
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
T. Hiyama
中科院分区：
文献类型：
--
作者：
Yuanbo Liu;T. Hiyama
大尺度地表温度的准确表征是众多环境研究关注的问题。由于地表温度的空间变异性和地表非均质性的不确定性，简单地将小尺度测量的地表温度平均到大尺度可能导致误传。卫星衍生的地表温度在大尺度观测中可能更加全面，但它往往存在卫星视图偏差，特别是对地形区域。为了考虑这些因素，提出了一种基于Stefan-Boltzmann定律和遥感地形校正方法的地表温度标度方法。针对卫星衍生的地表温度进行了进一步修改。选择了中国损失高原上空的一个地形区域作为考察对象。Lipton-Ward （L-W）方法最初是为解决山区地表温度反演的卫星视图偏差而开发的，从尺度的角度进行了研究。结合90米地形数据，90米地表温度和先进星载热发射反射辐射计（ASTER）的发射率产品使用这两种方法放大到900米。结果表明，该方法平滑了LST差异，减小了LST标准差，而L-W方法则没有。与地形校正后的900米地表温度进行对比进一步证实了这一点，900米地表温度是由ASTER传感器搭载同一卫星平台上的中分辨率成像光谱仪（MODIS）的地表温度产品获得的。
Accurate representation of land surface temperature (LST) at a large-scale is of great concern in numerous environmental studies. Simply averaging of LST measured at a small-scale into the large-scale may lead to misrepresentation due to spatial variability in LST and uncertainty in surface heterogeneity. The satellite-derived LST may be more comprehensive in large-scale observation, yet it often has the satellite-view biases, which is especially true to terrain area. To account for these factors, an approach for LST scaling was proposed, based on the Stefan-Boltzmann law and terrain correction approach used in remote sensing. It was further modified oriented to satellite-derived LST. A terrain area over the Loss Plateau of China was selected for examination. The Lipton-Ward (L-W) approach, which was originally developed for addressing the satellite-view biases in retrieved LST in mountain area, was also adopted in the examination from the perspective of scaling. Incorporated with 90-m topographical data, 90-m LST and emissivity products from The Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) were scaled up to 900-m using the two approaches. Results showed that the proposed approach smoothed the LST difference and reduced the standard deviation of LST but the L-W approach did not. This was further confirmed from the comparison with the terrain corrected 900-m LST, which was produced from the LST products of The MODerate resolution Imaging Spectroradiometer (MODIS) onboard the same satellite platform with ASTER sensor.