The Development of Microwave Vegetation Indices from WindSat Data

作者:Li, YQ (Li, Yunqing)[ 1,2 ] ; Shi, JC (Shi, Jiancheng)[ 1 ] ; Liu, Q (Liu, Qiang)[ 3 ] ; Dou, YJ (Dou, Youjun)[ 1 ] ; Zhang, T (Zhang, Tao)[ 4 ]

IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING

卷: 8  期: 9  页: 4379-4395  特刊: SI

DOI: 10.1109/JSTARS.2015.2423153

出版年: SEP 2015

摘要

The microwave vegetation indices (MVIs), including parameter A (MVIs_A) and parameter B (MVIs_B), have been recently developed based on advanced microwave scanning radiometer-earth observing system (AMSR-E) measurements. Coriolis/WindSat (WindSat) is a space-borne multifrequency polarimetric microwave radiometer with similar frequencies to the AMSR-E. Unlike the AMSR-E instrument configuration, the WindSat observation angles vary at the different frequencies and range from 49.9. to 55.3.. This variation results in significant uncertainty in deriving MVIs using WindSat data. In this study, we extended our algorithm for deriving MVIs from AMSR-E to that under WindSat sensor configuration by considering the measurements from different observation angles. We will present the theoretical basis for this new algorithm and then compare the two MVIs derived from these two sensors' data at global and pixel scales, respectively. We found that the MVIs from WindSat data and AMSR-E data share similar global distribution patterns and temporal trends. The MVIs_B at the 6.8- and 10.7-GHz frequency pair [ MVIs_B (6.8,10.7)] from WindSat data is somewhat higher than that from AMSR-E data, whereas the MVIs_B at the 10.7- and 18.7-GHz frequency pair [ MVIs_B (10.7,18.7)] is higher for AMSR-E. The MVIs from both the WindSat data and the AMSR-E data can be affected by satellite overpass times. The extended MVIs are expected to provide possible complementary information and contribute to vegetation monitoring, vegetation water content, biomass and soil moisture retrieval, and global climate change research.

通讯作者地址: Shi, JC (通讯作者)

Beijing Normal Univ, Chinese Acad Sci, State Key Lab Remote Sensing Sci, Inst Remote Sensing & Digital Earth, Beijing 100101, Peoples R China.

地址:

[ 1 ] Beijing Normal Univ, Chinese Acad Sci, State Key Lab Remote Sensing Sci, Inst Remote Sensing & Digital Earth, Beijing 100101, Peoples R China

[ 2 ] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[ 3 ] Henan Univ Econ & Law, Zhengzhou 450046, Peoples R China

[ 4 ] Natl Adm Surveying Mapping & Geoinformat, Satellite Surveying & Mapping Applicat Ctr, Beijing 101300, Peoples R China