激光遥感近期发展趋向

激光遥感就是用激光束作为光谱探头来探测大气成分。在过去的十五年中,这种激光雷达技术已被证明是一种测量大气中几种重要化学成分的有效探测方法,现在,它不但对我们了解大气起着重要的作用,而且正在

Estimating Soil Moisture in the Middle and Upper Reaches of the Heihe River Basin based on AMSR2 Multi-brightness Temperature

An approach to estimate soil moisture from AMSR2 multi-brightness temperature observations is preliminarily investigated in the middle and upper reaches of the Heihe River Basin (HRB). Based on the statistical relation between soil moisture and microwave emissivity from soil, a method called “4-grid cross-fitness” is used to obtain the statistical relation between in-situ soil moisture and soil temperature measurements of 4 WSN pixels in the upper reaches of the HRB during the period July, 2013~June, 2014. Then soil moisture in the middle and upper reaches of the HRB is retrieved. The retrieved soil moisture is compared with WSN soil moisture measurements, along with AMSR2 soil moisture products and GLDAS soil moisture product during the period July, 2014~October, 2014. The results show that the retrieved soil moisture perform remarkably better than the other 5 soil moisture products.Moreover, spatial patterns of the retrieved soil moisture and GLDAS soil moisture products are compared and analyzed as well via the auxiliary DEM and Landcover datasets. The results indicate that the spatial distribution of retrieved soil moisture perform with higher reasonability than GLDAS. This method may probably provide a feasible way for soil moisture retrieval over basin scales.