Arid
Validation of the Level 1c and Level 2 SMOS Products with Airborne and Ground-based Observations
Ruediger, C.; Walker, J. P.; Kerr, Y. H.; Mialon, A.; Merlin, O.; Kim, E. J.
通讯作者Ruediger, C.
会议名称MSSANZ 19th Biennial Congress on Modelling and Simulation (MODSIM)
会议日期DEC 12-16, 2011
会议地点Perth, AUSTRALIA
英文摘要

In the Austral summer and winter periods of 2010, two large field campaigns (the Australian Airborne Cal/val Experiments for SMOS (AACES)) were undertaken for the validation of the Level 1c brightness temperature and Level 2 soil moisture products of the ESA-led Soil Moisture and Ocean Salinity (SMOS) mission, which constitutes the first of a series of future soil moisture satellite missions. SMOS is also the first polar-orbiting satellite operating at a frequency of 1.4GHz (L-band) and even more importantly is the first 2-dimensional interferometric radiometer used for Earth observation purposes. Consequently, extensive and detailed field campaigns for its product validation are required. The field site of this study lies within the Murrumbidgee River catchment of southern New South Wales, in south-eastern Australia. The advantage of this particular catchment is its wide variety of surface conditions, ranging from flat, semi-arid areas in the west (mainly used for dryland farming) to the alpine ranges in the east near Canberra. Moreover, the seasonal differences and sporadic rain events during the campaigns meant that a wide range of conditions were found, resulting in a data set ranging from hot and dry to wet and cold. A total of 50,000km(2) was covered, using an airborne sensor platform, operating over the same microwave wavelength as SMOS.


The data collected with the airborne platform included passive L-band microwave observations, as well as measurements in the thermal infrared and eight spectral bands. Moreover, the catchment contains over 60 permanent soil moisture monitoring stations which were supplemented by spatially high-resolution soil moisture measurements across 20 focus farms on selected overpass days.


In this paper, we discuss the quality of both brightness temperature data sets, as well as compare the ground station data against the SMOS Level 2 soil moisture product. It is found that the overall brightness temperature observations of SMOS tend to be systematically similar to 10K warmer than the airborne observations, both during the winter and summer periods, as well as across different vegetation types, which suggests that there is a persistent bias in one of the data sets. Similarly, the SMOS soil moisture products consistently underestimate the soil moisture observed on the ground. Nevertheless, a significant improvement in the accuracy of the soil moisture product has been achieved between the latest two Level 2 versions and it is expected that the accuracy will again increase when the data from all validation campaigns have been assessed.


英文关键词passive microwave remote sensing soil moisture ground validation
来源出版物19TH INTERNATIONAL CONGRESS ON MODELLING AND SIMULATION (MODSIM2011)
出版年2011
页码2002-2008
EISBN978-0-9872143-1-7
出版者MODELLING & SIMULATION SOC AUSTRALIA & NEW ZEALAND INC
类型Proceedings Paper
语种英语
国家Australia
收录类别CPCI-S
WOS记录号WOS:000314989301142
WOS关键词SOIL-MOISTURE ; MICROWAVE EMISSION
WOS类目Computer Science, Interdisciplinary Applications ; Operations Research & Management Science ; Mathematics, Applied
WOS研究方向Computer Science ; Operations Research & Management Science ; Mathematics
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/300346
作者单位Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia
推荐引用方式
GB/T 7714
Ruediger, C.,Walker, J. P.,Kerr, Y. H.,et al. Validation of the Level 1c and Level 2 SMOS Products with Airborne and Ground-based Observations[C]:MODELLING & SIMULATION SOC AUSTRALIA & NEW ZEALAND INC,2011:2002-2008.
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