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Soil Moisture Sensing Using Spaceborne GNSS Reflections: Comparison of CYGNSS Reflectivity to SMAP Soil Moisture

Chew, C. C., Small, E. E.·2018·Geophysical Research Letters
DOI 10.1029/2018gl077905
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Abstract

This paper quantifies the relationship between forward scattered L‐band Global Navigation Satellite System (GNSS) signals, recorded by the Cyclone Global Navigation Satellite System (CYGNSS) constellation and Soil Moisture Active Passive (SMAP) soil moisture (SM). Although designed for tropical ocean surface wind sensing, the CYGNSS receivers also record GNSS reflections over land. The CYGNSS observations of reflection power are compared to SMAP SM between March 2017 and February 2018. A strong, positive linear relationship exists between changes in CYGNSS reflectivity and changes in SMAP SM, but not between the absolute magnitudes of the two observations. The sensitivity of CYGNSS reflectivity to SM varies spatially and can be used to convert reflectivity to estimates of SM. The unbiased root‐mean‐square difference between daily averaged CYGNSS‐derived SM and SMAP SM is 0.045 cm 3 /cm 3 and is similarly low between CYGNSS and in situ SM. These results show that CYGNSS, and future GNSS reflection missions, could provide global SM observations.

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  • Bistatic radar data contains signatures that have been used for wide-ranging Earth Science applications, including measuring ocean surface wind speeds, soil moisture, inland water body mapping, river width and surface slope estimation.

    “The bistatic radar data contains signatures that have been used for wide-ranging Earth Science applications, including measuring ocean surface wind speeds [4], soil moisture [5][6][7], inland water body mapping [8][9][10][11][12][13][14][15], and river width [16] and surface slope [17] estimation.”

    From Characterization of River Width Measurement Capability by Space Borne GNSS-Reflectometry (2024) · cites this paper as [5]

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Metadata

Authors
Chew, C. C., & Small, E. E.
Affiliations
  • University Corporation for Atmospheric Research Boulder CO USA
  • Department of Geological Sciences University of Colorado Boulder Boulder CO USA
ORCID
Venue
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Published
2018-05-05
Volume
45
Issue
9
Pages
4049-4057
ISSN
  • 0094-8276
  • 1944-8007
DOI
10.1029/2018gl077905
Cited by
392
References
0
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)

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