Knowledge Base

What are the latencies for SMAP radiometer data sets?

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.

Short name Title Latency

Required

# days hh:mm:ss

Actual (mean1)

# days hh:mm:ss

SPL1AP SMAP L1A Radiometer Time-Ordered Parsed Telemetry 0 days 12:00:00 0 days 4:02:54
SPL1BTB SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures 0 days 12:00:00 0 days 5:05:17
SPL1CTB SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures 1 day 00:00:00 0 days 5:05:59
SPL1CTB_E SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures 1 day 00:00:00 0 days 7:41:59
SPL2SMP SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture 1 day 00:00:00 0 days 12:11:39
SPL2SMP_E SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture 1 day 00:00:00 0 days 12:56:55
SPL3SMP SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture 2 days 02:00:00 1 day 05:33:38
SPL3SMP_E SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture 2 days 02:00:00 1 day 05:34:25
SPL3FTP SMAP L3 Radiometer Northern Hemisphere Daily 36 km EASE-Grid Freeze/Thaw State 2 days 02:00:00 1 day 02:51:18
SPL3FTP_E SMAP Enhanced L3 Radiometer Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State 2 days 02:00:00 1 day 03:34:16
SPL4SMAU SMAP L4 Global 3-hourly 9 km Surface and Rootzone Soil Moisture Analysis Update 7 days 00:00:00 2 days 15:53:00
SPL4SMGP SMAP L4 Global 3-hourly 9 km Surface and Rootzone Soil Moisture Geophysical Data 7 days 00:00:00 2 days 15:53:00
SPL4SMLM SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants N/A * N/A *
SPL4CMDL SMAP L4 Global Daily 9 km Carbon Net Ecosystem Exchange 14 days 00:00:00 9 days 23:23:00

1 Mean latency under normal operating conditions

* SPL4SMLM provides time-invariant constants and thus includes only one file per data version

Last Updated October 2021