Advanced InSAR atmospheric correction: MERIS/MODIS combination and stacked water vapour models

Li, Z., Fielding, E., Cross, P. and Preusker, R. (2009) Advanced InSAR atmospheric correction: MERIS/MODIS combination and stacked water vapour models. International Journal of Remote Sensing, 30(13), pp. 3343-3363. (doi: 10.1080/01431160802562172)

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Publisher's URL: http://dx.doi.org/10.1080/01431160802562172

Abstract

A major source of error for repeat-pass Interferometric Synthetic Aperture Radar (InSAR) is the phase delay in radio signal propagation through the atmosphere (especially the part due to tropospheric water vapour). Based on experience with the Global Positioning System (GPS)/Moderate Resolution Imaging Spectroradiometer (MODIS) integrated model and the Medium Resolution Imaging Spectrometer (MERIS) correction model, two new advanced InSAR water vapour correction models are demonstrated using both MERIS and MODIS data: (1) the MERIS/MODIS combination correction model (MMCC); and (2) the MERIS/MODIS stacked correction model (MMSC). The applications of both the MMCC and MMSC models to ENVISAT Advanced Synthetic Aperture Radar (ASAR) data over the Southern California Integrated GPS Network (SCIGN) region showed a significant reduction in water vapour effects on ASAR interferograms, with the root mean square (RMS) differences between GPS- and InSAR-derived range changes in the line-of-sight (LOS) direction decreasing from ,10mm before correction to ,5mm after correction, which is similar to the GPS/MODIS integrated and MERIS correction models. It is expected that these two advanced water vapour correction models can expand the application of MERIS and MODIS data for InSAR atmospheric correction. A simple but effective approach has been developed to destripe Terra MODIS images contaminated by radiometric calibration errors. Another two limiting factors on the MMCC and MMSC models have also been investigated in this paper: (1) the impact of the time difference between MODIS and SAR data; and (2) the frequency of cloud-free conditions at the global scale.

Item Type:Articles
Keywords:InSAR, atmospheric effects, correction, MERIS, MODIS, water vapour, deformation
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr Zhenhong
Authors: Li, Z., Fielding, E., Cross, P., and Preusker, R.
Subjects:G Geography. Anthropology. Recreation > GB Physical geography
G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TA Engineering (General). Civil engineering (General)
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:International Journal of Remote Sensing
Publisher:Taylor & Francis
ISSN:0143-1161
ISSN (Online):1366-5901
Published Online:22 July 2009
Copyright Holders:Copyright © 2009 Taylor & Francis
First Published:First published in International Journal of Remote Sensing 30(13):3343-3363
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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