SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 1

Data set id:

SPL2SMP

DOI: 10.5067/HF1KOE0Q85V7

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.

O'Neill, P. E., Chan, S., Njoku, E. G., Jackson, T. & Bindlish, R. (2015). SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture. (SPL2SMP, Version 1). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/HF1KOE0Q85V7. [describe subset used if applicable]. Date Accessed 12-15-2024.

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There is a more recent version of these data.
Version Summary

First public data release

Overview

This Level-2 (L2) soil moisture product provides gridded estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. Input SMAP L-band brightness temperature data used to derive soil moisture are resampled to an Earth-fixed, global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0). A variety of ancillary data are also used as input, such as soil texture and vegetation opacity. Note: These data are Beta-release quality, meaning that they have not undergone full validation and may still contain significant errors. Currently, in this Beta release, 6:00 p.m. ascending half-orbit granules are not considered by the SPL2SMP processing software; however, that inclusion is expected after further analysis. In addition, the data fields that indicate retrieval quality, called retrieval qual flag and retrieval qual flag option[1-5], were found to contain incorrect information. Users are advised to ignore these data fields in Version 1 of this product.

Parameter(s):

ALBEDOBRIGHTNESS TEMPERATURESOIL MOISTURE/WATER CONTENTSURFACE ROUGHNESSVEGETATION WATER CONTENT

Platform(s):

SMAP Observatory

Sensor(s):

SMAP L-BAND RADIOMETER

Data Format(s):

HDF5

Temporal Coverage:

9 September 2015 to 25 October 2015

Temporal Resolution:

49 minute

Spatial Resolution:

36 km

36 km

Spatial Coverage:

N:

85.044

S:

-85.044

E:

180

W:

-180

Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.

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Data Access & Tools

This data set has been retired. There is a more recent version of these data.

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General Questions & FAQs

How do I interpret the surface and quality flag information in the Level-2 and -3 passive soil moisture products?

SMAP data files contain rich quality information that can be useful for many data users. The retrieval quality flag and surface flag bit values and interpretations are documented in the respective product Data Fields pages of the user guides for these data products

SMAP Ancillary data sets are used to produce SMAP Level-1, -2, -3, and -4 standard data products.

The following table describes both the required and actual latencies for the different SMAP radiometer data sets. Latency is defined as the time (# days, hh:mm:ss) from data acquisition to product generation.

This short article describes the customization services available for SMAP data using Earthdata Search.

How to Articles

Filter and order from a data set web page using the Data Access Tool

Many NSIDC DAAC data sets can be accessed using the NSIDC DAAC's Data Access Tool. This tool provides the ability to search and filter data with spatial and temporal constraints using a map-based interface.Users have the option to

To convert HDF5 files into binary format you will need to use the h5dump utility, which is part of the HDF5 distribution available from the HDF Group. How you install HDF5 depends on your operating system.

The following are instructions on how to import and geolocate SMAP Level-1C HDF5 data in ENVI. Testing notes Software: ENVI Software version: 5.3 and above. If using version 5.3, service pack 5.3.1 is needed. Platform: Windows 7

NASA Earthdata Cloud Data Access Guide

The NASA Earthdata Cloud is the NASA cloud-based archive of Earth observations. It is hosted by Amazon Web Services (AWS). Learn how to find and access NSIDC DAAC data directly in the cloud.

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All data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is directly accessible through our HTTPS file system using Wget or curl. This article provides basic command line instructions for accessing data using this method.

This article highlights the NSIDC DAAC data sets available with customization options and outlines a workflow for searching, ordering, and customizing data in NASA Earthdata Search. This approach is ideal for users who want to download data to their local machine.

NASA Worldview is a map interface that allows users to interactively browse imagery, create visualizations, and download the underlying data.

NASA's Global Imagery Browse Services (GIBS) provides up to date, full resolution imagery for selected NSIDC DAAC data sets.

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