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引用次数: 2
摘要
中分辨率成像光谱辐射计(MODIS)可以利用近红外波段和传统红外波段对陆地和海洋的可降水量(PWV)进行高精度、大尺度的监测。MODIS nIR PWV仅在白天可用,可以在1×1km空间分辨率下获得高精度,而MODIS IR PWV可以在白天和夜间以较低的空间分辨率(5×5km)获得,但精度低于nIR PWV。本文通过与地面连续观测数据的比较,评价了MODIS水汽产品在红外和近红外波段的性能。结果表明,传统的线性回归分析并不是红外波段MODIS PWV标定的最佳选择。利用IGS和无线电探空仪在MODIS图像覆盖范围内的观测,正在为MODIS红外水汽产品开发一种新的校准模型,并对校准结果进行了介绍和评估。
MODIS infrared (IR) water vapor calibration model and assessment
Moderate Resolution Imaging Spectroradiometer (MODIS) can monitor precipitable water vapor (PWV) with high accuracy and large scales over land and ocean, using both near-infrared (nIR) bands and traditional IR bands. The MODIS nIR PWV is only available during daytime, which can be retrieved at 1×1km spatial resolution with high accuracy, while the MODIS IR PWV can be obtained during both the day and night time with a lower spatial resolution (5×5km), but is less accurate than the nIR PWV. In this paper, the performances of MODIS water vapor products at IR and nIR bands are evaluated by comparing with ground continuous GPSobservations. Results show that the traditional linear regression analysis is not the best choice to calibrate the MODIS PWV from the IR band. A new calibration model is being developed for the MODIS IR water vapor product using the IGS and radiosonde observations within the MODIS image coverage, and calibrated results are presented and assessed.