Look Angle Correction for SMAP L-Band Radiometer Using Geolocation Measurements

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Look_Angle_Correction_for_SMAP_LBand_Radiometer_Using_Geolocation_Measurements.pdf (11.86 MB)

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https://ieeexplore.ieee.org/abstract/document/10541066

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https://doi.org/10.1109/TGRS.2024.3405811
 http://hdl.handle.net/11603/34878

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UMBC Faculty Collection
UMBC GESTAR II

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Author/Creator ORCID

https://orcid.org/0000-0001-6326-8600

Date

2024-05-29

Type of Work

journal articles
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Program

Citation of Original Publication

Le Vine, David. M., Emmanuel P. Dinnat, Paolo De Matthaeis, and Jinzheng Peng. “Look Angle Correction for SMAP L-Band Radiometer Using Geolocation Measurements.” IEEE Transactions on Geoscience and Remote Sensing, 2024, 1–1. https://doi.org/10.1109/TGRS.2024.3405811.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain

Subjects

Antenna measurements
Antennas
Azimuth
Coastlines
Geolocation
Geology
Microwave Radiometer
Remote Sensing
Temperature measurement
Vectors

Abstract

Geolocation of the radiometer footprint in scanning instruments such as SMAP has been successfully demonstrated using the change in antenna temperature as the radiometer scans across land/water boundaries (coastlines). This measurement provides the distance of the footprint from the nominal coastline, but it does not provide information about the error in look angle and azimuth of the antenna boresight vector needed to correct for the geolocation error. A method for doing this is reported using fore and aft crossings of the boundary. The approach is demonstrated using the SMAP radiometer simulator and then applied to SMAP data over the west coast of Madagascar. The error estimates of 0.3 degrees for look angle and 0.15 degrees for azimuth are consistent with independent estimates.