The L3S SST data in this directory are produced by NESDIS OSPO and provided here as a courtesy to users to facilitate replacement of the prior full resolution CoastWatch regions.  The NOAA Advanced Clear-Sky Processor for Ocean (ACSPO) L3S-LEO is a family of multisensor super-collated (L3S) gridded 0.02º resolution SST products from low earth orbit (LEO) satellites. The L3S-LEO family is organized into three lines: PM, AM and Daily. The AM (mid-morning orbit) and PM (afternoon orbit) lines contain SST data from satellites with 9:30am/pm and 1:30am/pm equator crossing times, respectively. Both AM and PM lines are split into day-time (solar zenith angle < 90º) and night-time (solar zenith angle >= 90º) files, resulting in 4 files per day in total, which approximately cover the 24 hours diurnal cycle in 4 points. The Daily (DY) line combines PM and AM (day and night) SSTs into a single daily L3S SST that is normalized to 1:30am viewing conditions using a statistical model informed by surface wind speed and shortwave radiation.

The AM product is produced from three (currently two active) AVHRR FRACs (flown aboard METOP-A, B and C). The PM product is produced from three VIIRSs (flown aboard NPP, N20, N21) and MODIS (onboard Aqua; included until Dec 31 2022). 

The manifest files are updated each time a corresponding filetype is updated.  This file be used in automation to reduce the number of connections and file listings.  The file contains the filenames and a timestamp of when the file was updated which in turn can be used to formulate a pull of the needed dataset.  

Manifest files:
OSPO_L3S_AM_day_manifest
OSPO_L3S_AM_night_manifest
OSPO_L3S_PM_day_manifest
OSPO_L3S_PM_night_manifest

Example content (filename, date [YYYY-MM-DD], time [hh:mm:ss Z]):

20240921120000-OSPO-L3S_GHRSST-SSTsubskin-LEO_PM_N-ACSPO_V2.80-v02.0-fv01.0.nc 2024-09-26 16:51:08
20240922120000-OSPO-L3S_GHRSST-SSTsubskin-LEO_PM_N-ACSPO_V2.80-v02.0-fv01.0.nc 2024-09-26 16:51:10
20240925120000-OSPO-L3S_GHRSST-SSTsubskin-LEO_PM_N-ACSPO_V2.80-v02.0-fv01.0.nc 2024-09-27 05:54:05

Pulling an example manifest file: https://coastwatch.noaa.gov/pub/data/pub0053/coastwatch/sst/l3s/OSPO_L3S_PM_night_manifest
The filename of the desired file can then be appended to the base URL:  https://coastwatch.noaa.gov/pub/data/pub0053/coastwatch/sst/l3s/<filename>  
Some users have found using wget with the IPv4 option  (-4)  has success if a request receives a Forbidden error.  

Fifteen (15) days of operational near real-time data are available in this L3S OSPO mirror directory.

More information at https://coastwatch.noaa.gov/cwn/products/acspo-global-002o-gridded-super-collated-sst-and-thermal-fronts-low-earth-orbiting.html