Imaging · collection · 2020

UCAR-CU CYGNSS Level 3 Soil Moisture Version 1.0

Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/cygnu-l3sm1

The CYGNSS Level 3 Soil Moisture Product provides volumetric water content estimates for soils between 0-5 cm depth at a 6-hour discretization for most of the subtropics.

Description

The data were produced by CYGNSS investigators at the University Corporation for Atmospheric Research (UCAR) and the University Colorado at Boulder (CU), and derive from version 2.1 of the CYGNSS L1 SDR. The soil moisture algorithm uses collocated soil moisture retrievals from SMAP to calibrate CYGNSS observations from the same day.

For a given location, a linear relationship between the SMAP soil moisture and CYGNSS reflectivity is determined and used to transform the CYGNSS observations into soil moisture. The data are archived in daily files in netCDF-4 format. Two soil moisture variables report the volumetric water content in units of cm3/cm3.

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The variable SM_subdaily includes up to four soil moisture estimates per day. Another variable SM_daily provides a daily average. The time series covers the period from March 2017 to present.

Topics

Stated by source: Cyclone Global Navigation Satellite System · Delay Doppler Mapping Instrument · Soil Moisture/Water Content
From keywords: Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
Inferred from text: Soil sciences 70%

Provenance · 2 source records, 18 field assertions

Source	Key	Last seen	Raw
NASA Earthdata CMR	C2205122332-POCLOUD	15 d ago	JSON v1
NASA Data Portal	a84e7c11-9188-47c8-aa56-081b295a4a13	12 d ago	JSON v1

Field	Assertion	Extractor	Evidence
access_level	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[field].anzsrc:group:4106	enrichment · NASA CMR	taxonomy-embedding@1.0.0	title+keywords+description (70%)
concepts[field].local:field:astronomy	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:earth-environmental	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:ocean-atmospheric	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:physics	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[instrument].gcmd_instrument:ddmi	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[measured_variable].gcmd:earth-science/land-surface/soils/soil-moisture-water-content	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[platform].gcmd_platform:cygnss	source · NASA CMR	connector:nasa_cmr@1.0.0
created_date	source · NASA CMR	connector:nasa_cmr@1.0.0
description	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/Abstract
license_text	source · data nasa gov	connector:data_nasa_gov@1.0.0
publication_date	source · NASA CMR	connector:nasa_cmr@1.0.0
spatial	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/SpatialExtent
temporal	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/TemporalExtents
title	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/EntryTitle
updated_date	source · NASA CMR	connector:nasa_cmr@1.0.0
version_label	source · NASA CMR	connector:nasa_cmr@1.0.0

UCAR-CU CYGNSS Level 3 Soil Moisture Version 1.0

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