gher-ulg/DIVA: v4.6.1

DIVA (Data-Interpolating Variational Analysis) is a software tool dedicated to the spatial interpolation of in situ data in oceanography.

Released in June 2013.

• Two additional solvers: a parallel and iterative version
• Optimisations for large data sets
• Optimisations of file exchanges for use with ODV
• Highly optimised new version of the grid generator (typical reduction of a factor 10 in CPU time)
• Integration of faster error calculations into the 3D/4D version (using new ispec values)
• Clearer log files for debugging

(note: With the availability of gfortran, we decided to abandon the support of pure f77 compilations and this release needs Fortran 90 or Fortran 95 and -cpp preprocessing tools).

Example of performance gain using divabigtest (test with 1.5 million data points and a very fine mesh):

CPU time in seconds in 4.5.1 4.6.1 for - mesh 27 2 - analysis 318 159

The results presented in the right-hand side shows how the computation time evolves:

• for the computation when the number of observations increases.
• for the mesh generation when the correlation length is modified.