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| Titel |
An Assessment of the Capabilities of the ERS Satellites' Active Microwave Instruments for Monitoring Soil Moisture Change |
| VerfasserIn |
K. Blyth |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 1, no. 1 ; Nr. 1, no. 1, S.159-174 |
| Datensatznummer |
250000090
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| Publikation (Nr.) |
 copernicus.org/hess-1-159-1997.pdf |
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| Zusammenfassung |
| The launch of the European Remote sensing Satellite
(ERS-1) in July 1991 represented an important turning point in the development
of Earth observation as it was the first of a series of satellites which
would carry high resolution active microwave (radar) sensors which could
operate through the thickest cloudeover and provide continuity of data
for at least a decade. This was of particular relevance to hydrological
applications, such as soil moisture monitoring, which generally require
frequent satellite observations to monitor changes in state. ERS-1 and
its successor ERS-2 carry the active microwave instrument (AMI) which operates
in 3 modes (synthetic aperture radar, wind scatterometer and wave seatterometer)
together with the radar altimeter which may all be useful for the observation
of soil moisture. This paper assesses the utility of these sensors through
a comprehensive review of work in this field. Two approaches to soil moisture
retrieval are identified: 1) inversion modelling, where the physical effects
of vegetation and soil roughness on radar backscatter are quantified through
the use of multi-frequency and/or multi-polarization sensors and 2) change
detection where these effects are normalized through frequent satellite
observation, the residual effects being attributed to short-term changes
in soil moisture. Both approaches will be better supported by the future
European Envisat-l satellite which will provide both multi-polarization
SAR and low resolution products which should facilitate more frequent temporal
observation. |
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