NOAA CoastWatch provides sea surface temperature (SST) products derived
from NOAA's Geostationary Operational Environmental Satellites (GOES).
These products are created by combining three separate images, each created
1-hour apart and retaining the most recent temperature value. Therefore,
the near real-time images are updated every three hours.
GOES SST is determined by applying a regression equation to measurements
from the infrared channels.
Multispectral information for channels 1, 2, 4 and 5 are used to identify
clouds, wind effects, and other factors that may affect the values.
Each GOES satellite has its own SST regression equation. GOES SST spatial
resolution is nominally 4 km.
Validation of these algorithms was performed by comparing GOES-SST
retrievals against a quality controlled data set from global drifting and
moored buoy SST measurements. Comparisons were performed within one hour
and 5km of each other. Results show that the GOES-Buoy SST comparison has
a bias of 0.5 degree C and a standard deviation less than 1 degree C.
Validation results are available for 2013 and earlier.