MODIS数据反演地表温度的传感器视角校正研究

Calibration of View Angle for Retrieving Land Surface Temperature from the Moderate Resolution Imaging Spectroradiometer(MODIS)

提出了MODIS数据传感器视角的计算方法,并分析了视角的变化对大气透过率以及地表温度反演的影响。选取渤海地区一景影像进行实验研究,结果表明MODIS数据边缘的传感器视角可达55.02,°由此引起的大气透过率降低近0.086,引起的地表温度误差最高可达3.64℃。

This paper proposed the calibration of view angle when retrieving land surface temperature using Moderate Resolution Imaging Spectroradiometer （MODIS） data. MODIS instrument provides high radiometric sensitivity in 36 spectral bands ranging in wavelength from 0.4 μm to 14.4 μm with resolution of 250 m, 500 m, and lkm at nadir. Two MODIS instruments integrated on Terra and Aqua provide global coverage every one to two days. These MODIS instruments offer a look at terrestrial, atmospheric, and ocean phenomenology for a wide and diverse community of users throughout the world. The view angle can reach ±55° with a 2 330 km swath at the EOS orbit of 705 km. The transmittance path will be great different with the view angle from 0～ 55° which will cause a big impact on the accuracy of land surface temperature retrieval. The impact of view angle to atmosphere transmittance and land surface temperature is discussed in detail. An example of bohai region indicate that the maximum view angle of MODIS data on the image edge can reach 55.02°, which can bring to the error of 0. 086 for the atmosphere transmittance and 3. 64 C for the land surface temperature. Key words：