[ferret_users] using /limits and modulo longitude axis, ferret 6.7.2

[Hein Zelle <hein.zelle@xxxxxxxxxxxxx>]

Dear Ferret users,

I'm sure this was discussed recently, but I can't find it
immediately.  For some of our more complex weather charts, we start
with drawing a land mask in light green, something like

use etopo20
shade /hlim=-20:40 /vlim=30:70 /pal=green if (rose gt 0) then 1

As you can see when trying this with ferret 6.72, this only draws land
east of 20E.  The etopo data set has it's longitude boundary at 20E.
What am I doing wrong here?  It works fine with

set region /x=-20:40 /y=30:70
shade /pal=green if (rose gt 0) then 1

Unfortunately in some cases I can't always use the region, because we're
plotting complex transformed variables which use the x dimension for
other purposes.  It also breaks when overlaying on top of a plot which
used limits before.


A second problem:

shade /hlimits=-20:40        works fine,
shade /hlimits=20w:40e       doesn't 
   (check the X axis labels! 20w, 60w, 100w, ... , 180, 140e, 100e, 60e)


This last one appears to be a software bug, but perhaps I've missed
something.


Kind regards,
     Hein



-- 

Dr. Hein Zelle
Advisor Meteorology & Oceanography

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