全球必威体育精装版的关于NASA L波段主被动卫星SMAP土壤水分产品的表现评估.pdfVIP

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 54, NO. 8, AUGUST 2016 4929 A Preliminary Evaluation of the SMAP Radiometer Soil Moisture Product Over United States and Europe Using Ground-Based Measurements Jiangyuan Zeng, Member, IEEE, Kun-Shan Chen, Fellow, IEEE, Haiyun Bi, and Quan Chen Abstract—The Soil Moisture Active Passive (SMAP) mission, I. INTRODUCTION which is the newest L-band satellite that is speci?cally designed for soil moisture monitoring, was launched on January 31, 2015. OIL moisture plays a signi?cant role in numerous A beta quality version of the SMAP radiometer soil moisture S hydrological-related processes [1]–[3]. A good knowledge product was recently released to the public. It is crucial to evaluate of the spatiotemporal dynamic of soil moisture proves particu- the reliability of this product before it can be routinely used in larly important in various environmental applications, such as hydrometeorological studies at a global scale. In this paper, we carried out a preliminary evaluation of the SMAP radiometer weather and climate forecasting, agricultural productivity pre- soil moisture product against in situ measurements collected from dictions, ?ood monitoring, and drought early warning [4]–[6]. three networks that cover different climatic and land surface For this reason, soil moisture has been of?cially recognized as conditions, including two dense networks established in the U.S. an Essential Climate Variable (ECV) by the Global Climate and Finland, and one sparse network set up in Romania. Results Observing System (GCOS) [7], [8]. Ground measurements are show that the SMAP soil moisture product is in good agreement with the in situ measurements, although it exhibits dry or wet often sparse and also have limited coverage that cannot capture bias at different network regions. It well reproduces the temporal the spatiotemporal characteristics of soil moi