Pre-Processing for a multi-variable image / animation#
This document is part of a series teaching how to Create a multi-variable image / animation from a coupled ice sheet - climate simulation
For general advice on the NetCDF CF reader see The NetCDF CF reader
For a compbined visualization of different models / data sets, all files need the same time axis. Different models will usually use different specifications, sending you straight to hell. One solution that works: resample all files to the same number of time steps, then use:
ncks -Av time MASTER_FILE FILE1 ncks -Av time MASTER_FILE FILE2 ...
to get all on the same time axis. If that causes trouble (e.g. because of float/double conversions), look into
The time axis must not contain negative values (don’t ask how long it took to figure this out)
For extruding with topography it’s best to have the topography in the same file as the data of interest. See Extrude a land surface based on topography for hints.
MPI-OM 2d data needs:
cdo -setzaxis,surface IN OUT
to get rid of the layer-dimension that does not have any content.