SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update V007

SMAP Level-4 (L4) surface and root zone soil moisture data are provided in three products:

SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data (SPL4SMGP, DOI: 10.5067/EVKPQZ4AFC4D)
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update (SPL4SMAU, DOI: 10.5067/LWJ6TF5SZRG3)
SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants (SPL4SMLM, DOI: 10.5067/KN96XNPZM4EG).

For each product, SMAP L-band brightness temperature data from descending and ascending half-orbit satellite passes (approximately 6:00 a.m. and 6:00 p.m. local solar time, respectively) are assimilated into a land surface model that is gridded using an Earth-fixed, global cylindrical 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) projection.

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Additional Info

Field	Value
Maintainer	NSIDC Services
Last Updated	July 17, 2025, 16:15 (UTC)
Created	March 31, 2025, 21:00 (UTC)
accessLevel	public
bureauCode	{026:00}
catalog_@context	https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id	https://data.nasa.gov/data.json
catalog_conformsTo	https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy	https://project-open-data.cio.gov/v1.1/schema/catalog.json
citation	SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update V007. Version 007. Archived by National Aeronautics and Space Administration, U.S. Government, NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/LWJ6TF5SZRG3.
graphic-preview-description	This application allows you to interactively browse global satellite imagery within hours of it being acquired. You can also save it, share it, and download the underlying data.
graphic-preview-file	https://worldview.earthdata.nasa.gov/?v=-215.35490720580785,-72.26175513012362,124.98316257744611,94.23627065806534&l=SMAP_L4_Analyzed_Surface_Soil_Moisture,Coastlines_15m,MODIS_Terra_CorrectedReflectance_TrueColor&lg=false&t=2022-04-09-T04%3A00%3A00Z
harvest_object_id	50efb50b-ea3b-4021-a753-1eb39f0f56fa
harvest_source_id	61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title	DNG Legacy Data
identifier	C2537927247-NSIDC_ECS
issued	2015-03-31
landingPage	https://doi.org/10.5067/LWJ6TF5SZRG3
language	{en-US}
metadata_type	geospatial
modified	2025-03-20
programCode	{026:001}
publisher	NASA NSIDC DAAC
resource-type	Dataset
source_datajson_identifier	true
source_hash	99272567c1066fdc897ed382475ffa05a34199162e52d739bef39243f1d7cbb7
source_schema_version	1.1
spatial	-180.0 -85.044 180.0 85.044
temporal	2015-03-31T00:00:00Z/2025-03-24T00:00:00Z
theme	{geospatial}