Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.550e..51l&link_type=abstract
Proceedings of the FRINGE 2003 Workshop (ESA SP-550). 1-5 December 2003, ESA/ESRIN, Frascati, Italy. Editor: H. Lacoste. Publish
Physics
Scientific paper
] For the first time, the application of a spaceborne near infrared (IR) water vapour product from the NASA Moderate Resolution Imaging Spectroradiometer (MODIS) for reducing water vapour effects of ERS-2 measurements are presented. The MODIS near IR water vapour product has been available since the end of February 2000 with a spatial resolution of 1km (at nadir) and a moderate accuracy of 5-10%. Coincident data with ERS-2 used in this study were located over Mt. Etna and Southern California. The results showed that the MODIS near IR water vapour product could be useful in reducing atmospheric effects in ERS-2 SAR interferometric data. Taking these results into account and the fact that, the MEdium Resolution Imaging Spectrometer (MERIS) has a higher accuracy and is on board the same platform, ENVISAT, as the Advanced Synthetic Aperture Radar (ASAR), future prospects look optimistic. The major limitation for either MODIS or MERIS is the reliance on cloud-free water vapour retrievals with the percentage of cloud free observations as low as 25%. In this paper, also for the first time, 3D GPS water vapour (or wet refractivity) models were applied to correct ERS-2 SAR interferometric data. Firstly, the WAter Vapour Extraction Software (WAVEs), developed at UCL, was used to construct a 3D water vapour (or wet refractivity) model with an appropriate resolution making full use of the spatial structure of zenith wet delays; then the difference in LOS (Line-of- Sight) path delays were calculated and applied to correct InSAR measurements. The results showed that the volumetric fields derived using the 3D GPS water vapour model can reduce water vapour effects significantly. It also showed that such 3D models are sensitive to the distribution of GPS receivers. Presently, a new way to fuse MODIS or MERIS with ground-based GPS networks within the WAVEs package is under investigation at UCL.
Cross Paul
Li Zaidong
Müller Jan-Peter
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