中文    English
当前位置: 本站首页 » 科学研究 » 科研成果 » 正文

钟燕飞--Blind spectral unmixing based on sparse component analysis for hyperspectral remote sensing imagery

发布日期:2016-11-30 08:54:46 阅读次数:[1465]次 作者:

核心提示:来源出版物: ATMOSPHERIC MEASUREMENT TECHNIQUES

作者: Zhong, YF (Zhong, Yanfei); Wang, XY (Wang, Xinyu); Zhao, L (Zhao, Lin); Feng, RY (Feng, Ruyi); Zhang, LP (Zhang, Liangpei); Xu, YY (Xu, Yanyan)
来源出版物: ATMOSPHERIC MEASUREMENT TECHNIQUES  卷: 9  期: 9  页: 4487-4501  DOI: 10.5194/amt-9-4487-2016  出版年: SEP 12 2016
摘要: A high spatial and temporal resolution of the precipitable water vapour (PWV) in the atmosphere is a key requirement for the short-scale weather forecasting and climate research. The aim of this work is to derive temporally differenced maps of the spatial distribution of PWV by analysing the tropospheric delay "noise" in interferometric synthetic aperture radar (InSAR). Time series maps of differential PWV were obtained by processing a set of ENVISAT ASAR (Advanced Synthetic Aperture Radar) images covering the area of southern California, USA from 6 October 2007 to 29 November 2008. To get a more accurate PWV, the component of hydrostatic delay was calculated and subtracted by using ERA-Interim reanalysis products. In addition, the ERA-Interim was used to compute the conversion factors required to convert the zenith wet delay to water vapour. The InSAR-derived differential PWV maps were calibrated by means of the GPS PWV measurements over the study area. We validated our results against the measurements of PWV derived from the Medium Resolution Imaging Spectrometer (MERIS) which was located together with the ASAR sensor on board the ENVISAT satellite. Our comparative results show strong spatial correlations between the two data sets. The difference maps have Gaussian distributions with mean values close to zero and standard deviations below 2 mm. The advantage of the InSAR technique is that it provides water vapour distribution with a spatial resolution as fine as 20m and an accuracy of similar to 2 mm. Such high-spatial-resolution maps of PWV could lead to much greater accuracy in meteorological understanding and quantitative precipitation forecasts. With the launch of Sentinel-1A and Sentinel-1B satellites, every few days (6 days) new SAR images can be acquired with a wide swath up to 250 km, enabling a unique operational service for InSAR-based water vapour maps with unprecedented spatial and temporal resolution. (C) 2016 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS). Published by Elsevier B.V. All rights reserved. 


版权所有:测绘遥感信息工程国家重点实验室   
联系地址: 中国·武汉市珞瑜路129号   邮编: 430079   E-mail:liesmars@whu.edu.cn
Tel/Fax:027-68778969(办公室) 027-68778229(国际交流办公室)027-68778525(研究生管理办公室)