基于MODIS数据的黑龙江省大气水汽含量反演

Retrieval of Vapor Content of Atmosphere Based on MODIS Data in Heilongjiang Province

利用两通道比值法、三通道比值法和姜立鹏等改进的三通道算法,应用MODIS影像资料进行黑龙江省大气水汽含量的反演,并结合探空实测数据进行反演精度验证。结果表明,两通道比值法的反演结果最好,计算结果与实测数据间相关系数为0.9664,三通道比值法的反演结果次之,相关系数为0.939,姜立鹏等改进的三通道算法的反演结果最差,相关系数仅为0.8385;用两通道算法反演的大气水汽含量的时间变化特征与黑龙江省季节性气候变化特征相符,空间变化特征与水体上空水汽总量大于陆地上空水汽总量的实际情况相一致。由此可见,两通道比值法是适合黑龙江省大气水汽含量遥感反演的方法。

By using the two-channel ratio arithmetic, the three-channel ratio arithmetic and the improved Jiangg three-channel ratio arithmetic, the vapor content of atmosphere was retrieved based on MODIS data in Heilongjiang Province. The retrieval precision was validated by using sounding real-measure data. It was indicated that the results retrieved by the two-channel ratio arithmetic were the best. The correlation coefficient between calculated results and the real-time measured data was 0. 9664. The results retrieved by the three-channel ratio arithmetic took the second place. The relevant correlation coefficient was 0. 939. The results retrieved by improved Jiang~ arithmetic was the worst. The relevant cor- relation coefficient was 0. 8358. The time change characteristic of the vapor content of atmosphere retrieved by the two-channel ratio arithmetic ac- corded with the seasonal climate change characteristic in Heilongjiang Province, while the spatial change characteristic accorded with the actual circumstance that the vapor gross above water body was bigger than it above land. Consequently the two-channel ratio arithmetic was a suitable re- trieval method in Heilongiiang Province.