Geolocation of AMSR-E Data

The process of determining the geographic latitude and longitude (lat/lon) of the center point of the footprint is called geolocation, which is currently suboptimal for the Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) Level 1 data provided by Japan Aerospace Exploration...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2008-10, Vol.46 (10), p.3098-3103
Main Authors: Wiebe, H., Heygster, G., Meyer-Lerbs, L.
Format: Article
Language:English
Subjects:
Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E)
Applied geophysics
Brightness temperature
Earth Observing System
Earth sciences
Earth, ocean, space
Exact sciences and technology
Footprints
Frequency
geolocation
Grounds
Instruments
Internal geophysics
LON
Longitude
Mathematical analysis
Microwave radiometry
Microwave sensors
Optimization methods
Radiometers
Remote sensing
Root mean square
Satellite broadcasting
Standard deviation
Viewing
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Summary:The process of determining the geographic latitude and longitude (lat/lon) of the center point of the footprint is called geolocation, which is currently suboptimal for the Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) Level 1 data provided by Japan Aerospace Exploration Agency (JAXA). Here, we present a study for improving the geolocation. The viewing angles (the nadir angle and the scan angle) that define the boresight direction of the instrument are optimized, and new lat/lon coordinates are calculated. The optimization method is based on minimizing the differences between ascending and descending swaths. The results of the calculated viewing angles here have an overall standard deviation of 0.005deg, which is 170 m on ground for the nadir angle and 70 m for the scan angle. The residual geolocation error ranges between 425 m (89 GHz) and 1425 m (6 GHz). The averaged repositioning between JAXA and our geolocation ranges between 3.5 and 7 km, i.e., in the order of one footprint size at 89 GHz. A comparison with a similar study, performed by Wentz et al., shows a good agreement in the viewing angles; the root mean square of the differences is 0.0083deg (ap 283 m) for the nadir angle and 0.0132deg (ap 191 m) for the scan angle.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2008.919272