The majority of SMAP data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), are now available as customizable data subscriptions. Data subscriptions automatically deliver new data as they become available; deliveries can be made on an hourly, daily, weekly, or monthly basis, depending on your preference. This new service also allows you to apply customization options to your order, including reformatting, reprojecting, and spatial and parameter subsetting. For more information on setting up the subscription, please visit https://nsidc.org/daac/subscriptions.html.
For further details on SMAP data sets, including data access, please visit: https://nsidc.org/data/smap/