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gsw is an R package that provides a connection to software relating to TEOS, the Thermodynamic Equation Of Seawater (see http://www.teos-10.org). This connection involves R wrappers to C functions within the GSW-C library (https://github.com/TEOS-10/GSW-C, release v3.06-16-0, commit 657216dd4f5ea079b5f0e021a4163e2d26893371), along with a data file within the GSW-Matlab library (https://github.com/TEOS-10/GSW-Matlab/blob/master/Toolbox/library/gsw_data_v3_0.mat, commit 38c9635d6fd93e74c2648e4ee23cec49c1f58530).
The foundational algorithms upon which both GSW-C and GSW-R rest were devised by the Scientific Committee on Oceanic Research / International Association for the Physical Sciences of the Oceans, Working Group 127. These algorithms were recommended as a replacement for a previous system (called UNESCO-80) at the twenty-fifth assembly in the Intergovernmental Oceanographic Commission in 2009.
The gsw functions reproduce test values in the GSW-Fortran documentation to a tolerance of 1.5e-8, the default for numerical comparison in R working on a 64-bit machine. This offers some assurance that the coding process has not introduced errors.
The naming convention in gsw is patterned on the system described at http://www.teos-10.org/pubs/gsw/html/gsw_contents.html, as a way to reduce the effort users might face in switching to R.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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