pssac: Use Cartesian projection by default unless -S is used #4088
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Description of proposed changes
For most GMT modules, if -J is not given, GMT uses -JX15c for Cartesian
data, and -JQ15c for Geographic data.
pssac can either plot seismograms as time series (Cartesian data)
or plot seismograms on maps (Geographic data). Currently, pssac always
uses -JQ15c when -J is not given.
Plotting seismograms as time series gives the following error:
because GMT sets the default -JQ15c. But for geographic plots, -S
(controling the waveform time scaling) is required.
Obviously, the -JQ15c is the wrong choice. This PR fixes the issue.
In this PR, pssac always use Cartesian projection, unless -S is used.
All tests still pass. With this PR, the command
plots seismograms using -JX15c, and command (with -S option)
plots seismograms on maps, using -JQ15c.