Data Citation and Acknowledgment
As a condition of using these data, you must cite the use of this data set. Such a practice gives credit to data set producers and advances principles of transparency and reproducibility.
Reichle, R., De Lannoy, G., Koster, R. D., Crow, W. T., Kimball, J. S., Liu, Q. & Bechtold, M. (2022). SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants. (SPL4SMLM, Version 7). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/KN96XNPZM4EG. [describe subset used if applicable]. Date Accessed 04-27-2025.
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Other standard citation formats may be found on the DOI Citation Formatter website (paste 10.5067/KN96XNPZM4EG into the top form field).
Describing subset: When applicable, include the information a reader would need to extract the same subset at the end of your citation. If multiple or complex steps were incolved, it may be more appropriate to include this information in the paper itself.
See our Citation Policies for more details about how to structure your data citation.
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COMPREHENSIVE Level of Service
Data: Data integrity and usability verified; data customization services available for select data
Documentation: Key metadata and comprehensive user guide available
User Support: Assistance with data access and usage; guidance on use of data in tools and data customization services
In this section
Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.
Data Access & Tools
A free NASA Earthdata Login account is required to access these data. Learn More
Quickly download a few files using a web browser, or access data through a command-line utility such as WGET.
Related Help Resources
Type:
service
Filter files before downloading based on date, spatial area, or file name. Choose from various download options, such as Python script. Export bounding boxes as a GeoJSON.
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Search and order data from all NASA DAACs using spatial and temporal filters in a map interface. Reformatting, reprojecting, and subsetting options are available for some data sets.
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Type: Web Application
earthaccess is a python library to search and access NASA Earth science data with just a few lines of code.
Supported software languages:
Python
Related Help Resources
Programmatically request selected data products through our API. This tool is valuable for selecting just the parameters you need from big data sets. Apply spatial and temporal filters, subsetting, reformatting, and reprojection.
Related Help Resources
Customization Capabilities:
data reformatting
reprojection
spatial subsetting
variable subsetting
Output Projections:
WGS 84 / NSIDC EASE-Grid North
WGS 84 / NSIDC EASE-Grid Global
WGS 84 / NSIDC EASE-Grid South
Geographic
Polar Stereographic
UTM Northern Hemisphere
UTM Southern Hemisphere
Programmatically request selected data products through our API. This tool is valuable for selecting just the parameters you need from big data sets. Apply spatial and temporal filters, subsetting, reformatting, and reprojection.
Related Help Resources
Customization Capabilities:
data reformatting
reprojection
spatial subsetting
variable subsetting
Output Projections:
WGS 84 / NSIDC EASE-Grid North
WGS 84 / NSIDC EASE-Grid Global
WGS 84 / NSIDC EASE-Grid South
Geographic
Universal Transverse Mercator
Polar Stereographic
Programmatically request selected data products through our API. This tool is valuable for selecting just the parameters you need from big data sets. Apply spatial and temporal filters, subsetting, reformatting, and reprojection.
Related Help Resources
Customization Capabilities:
data reformatting
spatial subsetting
temporal subsetting
variable subsetting
Programmatically request selected data products through our API. This tool is valuable for selecting just the parameters you need from big data sets. Apply spatial and temporal filters, subsetting, reformatting, and reprojection.
Related Help Resources
Customization Capabilities:
data reformatting
spatial subsetting
temporal subsetting
variable subsetting
Sign up for automatic delivery of new data from active NASA satellite missions. Customize data with reformatting, reprojection, and subsetting if desired.
Related Help Resources
Customization Capabilities:
data reformatting
reprojection
spatial subsetting
variable subsetting
Access data directly from the NASA Earthdata Cloud via Amazon Web Services Simple Storage Service (AWS S3). This access option is only available when working within the us-west-2 region and requires additional AWS S3 credentials.
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Type:
service
Geolocate and display EASE-Grid and EASE-Grid 2.0 data sets with IDL software.
Supported software languages:
IDL
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Explore contents of HDF4 and HDF5 files, including file structure, metadata, and parameter values.
Related Help Resources
Type: Downloadable Software
Calculate past and future satellite overpasses, based on latitude/longitude or map location.
Type: Web Application
Visualize georeferenced arrays in NetCDF, HDF and GRIB formats. Plot data on global or regional maps, choosing from multiple map projections. Overlay continent outlines or masks.
Type: Downloadable Software