The JPL SMAP Version 4.0 product spans the full mission, with data available from April 2, of 2015 to the present. Global coverage data products include an 8day_running mean as well as monthly averages. Level 2 swath data are also available as part of the product release. They are available with a latency of 3 days for the L2 dataset, and 8 days and 1 month for the respective L3 products. The spatial resolution of the SMAP sensor, approximately 40km, allows for improved applications to coastal and regional studies. The image shows the seasonal average surface salinity for the summer of 2015. Clearly visible is the freshwater plume that is typical for the Gulf of Mexico. Features associated with the Loop Current can also be identified.
Data is available through FTP at: ftp://podaac-ftp.jpl.nasa.gov/allData/smap/
Subsetting and data extraction are available through https://podaac-tools.jpl.nasa.gov/las/UI.vm
Documentation, which includes validation may be found at: ftp://podaac-ftp.jpl.nasa.gov/allData/smap/docs/JPL-CAP_V4/