摘要
应用美国EOS/MODIS遥感和贵州省地面气象台站网的观测数据,对2004～2005年贵州冬季积雪状况进行空基和地基观测结果的对比分析。用归一化积雪指数NDSI=(ch4-ch6)/(ch4+ch6)对遥感图像进行处理。当NDSI>0.40,ch2>0.11,ch4>0.10并且地表温度<285K时,判定该点为有雪。计算处理后得到的积雪覆盖区域图像比地面观测等值线图的区域大。在无云或少云情况下遥感积雪监测比地面观测准确。遥感积雪监测对农业生产和作物估产有较大的应用前景。
Contrastive analyze of the differences of snow cover graphs between weather station observation and EOS/MODIS of Guizhou were worked out by means of normalized difference snow index (NDSI) during the winter between 2004 and 2005. NDSI=(ch_~4 -ch_~6 )/(ch_~4 +ch_~6 ). As NDSI>0.4,ch_~2 >0.11,ch_~4 >0.10 and ground temperature <285K, there have snow covered. The result is the snow cover area from EOS/MODIS bigger than that from weather stations. Also, the snow cover area from EOS/MODIS is more accurate in clear day. Remote sensing monitoring snow cover with EOS/MODIS is useful in agriculture and estimating the crop yield.
出处
《贵州农业科学》
CAS
2005年第3期60-62,共3页
Guizhou Agricultural Sciences
基金
贵州省科技基金项目[(2004)3071号]
