negative longitudes

[Andrew Woolf <awo@xxxxxxxxxxxxxxxxxxxx>]

In server/Ferret.pl, the routine fixLongitude() unconditionally adds 360
to negative longitudes.

This causes problems for a netCDF variable defined on a longitude axis
which goes, for example, from -10 (ie 10 west) to 35; you get an 'illegal
limits' error from ferret.

For global datasets, you can set the 'modulo' attribute for the longitude
axis, but not for axes smaller than 360 degrees.

I can, of course, use a ferret init_script to redefine the xaxis to the
range 350->395, but I think this is an inelegant solution.

Any other ideas?



Also can someone tell me how to redefine an axis by adding 360 on?!

Instead of:

define axis/x=350e:395e:0.25 xlon

I want to do something like:

define axis/x=xlon+360 xlon

But that doesn't work.

-- 
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Andrew Woolf  (awo@mail.nerc-essc.ac.uk)
Environmental Systems Science Centre (ESSC)
Reading University
3 Earley Gate
Whiteknights
Reading RG6 6AL
UNITED KINGDOM
Phone: +44 (0)118 931 8741   Fax: +44 (0)118 931 6413
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