SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 3
Data set id:
SPL1BTB
DOI: 10.5067/YV5VOWY5V446
There is a more recent version of these data.
Version Summary
Version Summary
Changes to this version include:
- Updated reflector thermal model
- Reflector emissivity value back to baseline
- All calibration coefficients updated back to 3/31/15
- Direct Galaxy quality flag changed: set when s/c nadir is greater than 5 degrees
- Reflected Sun quality flag changed: set when specular solar theta is less than 15 degrees
- Sea ice fraction computation implemented
Overview
This Level-1B (L1B) product provides calibrated estimates of time-ordered geolocated brightness temperatures measured by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. SMAP L-band brightness temperatures are referenced to the Earth's surface with undesired and erroneous radiometric sources removed.
Parameter(s):
BRIGHTNESS TEMPERATURE
Platform(s):
SMAP Observatory
Sensor(s):
SMAP L-BAND RADIOMETER
Data Format(s):
HDF5
HDF5
Temporal Coverage:
- 31 March 2015 to 4 June 2018
Temporal Resolution:
- 49 minute
Spatial Resolution:
- 47 km
- 36 km
Spatial Reference System(s):
Not Specified
Spatial Coverage:
- N:86.4S:-86.4E:180W:-180
Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.
Data Access & Tools
This data set has been retired. There is a more recent version of these data.
Documentation
User Guide
ATBDs
Quality Assessment Reports
Product Specification Documents
Help Articles
General Questions & FAQs
This article covers frequently asked questions about the NASA NSIDC DAAC's Earthdata cloud migration project and what it means to data users.
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.
The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is migrating its primary data access from its legacy, on-premises archive to the NASA Earthdata Cloud.
How to Articles
Many NSIDC DAAC data sets can be accessed using 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 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.
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.
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.