SMAP L1A Radiometer Time-Ordered Parsed Telemetry, Version 1

Data set id:

SPL1AP

DOI: 10.5067/3G0GFQR7OT5E

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.

Piepmeier, J. R., Kim, E. J., Mohammed, P., Peng, J. & Ruf, C. (2015). SMAP L1A Radiometer Time-Ordered Parsed Telemetry. (SPL1AP, Version 1). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/3G0GFQR7OT5E. [describe subset used if applicable]. Date Accessed 02-22-2025.

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

First public data release

Overview

Each Level-1A (L1A) data file/granule incorporates all radiometer data downlinked from the Soil Moisture Active Passive (SMAP) spacecraft for one specific half orbit. The data are scaled instrument counts of the following:

The first four raw moments of the fullband channel for both vertical and horizontal polarizations
The complex cross-correlations of the fullband channel
The 16 subband channels for both vertical and horizontal polarizations.

Parameter(s):

INSTRUMENT COUNTS

Platform(s):

SMAP Observatory

Sensor(s):

SMAP L-BAND RADIOMETER

Data Format(s):

HDF5

Temporal Coverage:

31 March 2015 to 26 October 2015

Temporal Resolution:

49 minute

Spatial Resolution:

40 km

40 km

Spatial Coverage:

N:

86.4

S:

-86.4

E:

180

W:

-180

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

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

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General Questions & FAQs

How to learn more about SMAP ancillary data

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.

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.

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.

Programmatic Data Access Guide

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.

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