[gradsusr] reverting zlev on lat4ds

[Eric Altshuler]

Henrique,

Try using 'set yflip on' before displaying the field. The y-axis (corresponding to the z coordinate in your case) and the field itself will both be plotted with the reverse orientation.

Best regards,

Eric L. Altshuler
Assistant Research Scientist
Center for Ocean-Land-Atmosphere Studies
4041 Powder Mill Road, Suite 302
Calverton, MD 20705-3106
USA

E-mail: ela at cola.iges.org
Phone: (301) 902-1257
Fax: (301) 595-9793

----- Original Message -----
From: "Henrique M. J. Barbosa - IFUSP" <hbarbosa at if.usp.br>
To: "Grads" <gradsusr at gradsusr.org>
Sent: Wednesday, April 18, 2012 4:23:06 PM
Subject: [gradsusr] reverting zlev on lat4ds


Dear All, 


I want to convert a simple binary file to grads_grib. However, the vertical levels are meters above sea level and range between 20m to 20000m. 


I am trying lats4d. It works and I get a grib and ctl that I can open in grads. However, the vertical levels are reversed. I mean, z=1 is associated with 20km and not with 20m. I already tried the -zrev option, but that only reverts the levels written to the grib file (I checked that), and not the levels written to the CTL file. 


Hence, using or nor using zrev makes no difference to how grads plots the fields. For instance, a vertical crossection starts "at ground" at 20000m and goes "up to" 20m on the top of the plot. If I try something like: 


set lat -20 
set lev 20 20000 
plot rh 

Data Request Error: Invalid grid coordinates 
Varying dimension 2 decreases: 36 to 1 


It gives an error. How do I get lats4d writing the CTL following -zrev?? 
Is this a bug in LATS.c code? Or is there an option that I am not using? 


By the way, I am using opengrads 2.0.a9.oga.1 and the lats4d that comes with it. 


Thanks, 
Henrique 


-- 

---------------------------------------------------------------- 
Prof. Henrique M.J. Barbosa Phone:+[55] (11) 3091 6647 
Ed. Basilio Jafet, Sala 100 Cell:+[55] (11) 8380 8001 
Dep. de Fisica Aplicada FAX:+[55] (11) 3091 6749 
Instituto de Fisica - USP 
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05508-900, Sao Paulo, SP, Brazil msn: hmjbarbosa at yahoo.com 
http://www.fap.if.usp.br/~hbarbosa e-mail: hbarbosa at if.usp.br 

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