[gradsusr] GrADS no plot if the domain is small and the data do not vary

[Eric Altshuler]

Hello Luca, 

Are you using 'set gxout shaded'? If so, you need to specify one more value for ccols than for clevs: 


'set clevs 30 45 60' 
'set ccols 3 4 5 6' 


Best regards, 


Eric L. Altshuler 
Research Scientist 
Center for Ocean-Land-Atmosphere Studies 
253 Research Hall, Mail Stop 6C5 
George Mason University 
4400 University Drive 
Fairfax, VA 22030 USA 

E-mail: ela at cola.iges.org 
Phone: (703) 993-5725 
Fax: (703) 993-5770 

----- Original Message -----
From: "Senorluca" <senorluca at email.it> 
To: gradsusr at gradsusr.org 
Sent: Thursday, October 3, 2013 6:28:27 AM 
Subject: [gradsusr] GrADS no plot if the domain is small and the data do not vary 


Hello, 
when GrADS run a plot on a very small region, if it encounters a change in value, omit the script settings that indicate what color to use for that particular value plots and the background color (white or black depending on "Set Display color black / white. " 

I am using the files that contain data on cloud cover with values ​​ranging from 0% to 100% 

These are the settings of values ​​and colors 
'set clevs 30 45 60' 
'set ccols 4 5 6' 

I expect that for values ​​around the "100%" uses the color "6" and the values ​​around the "0%" uses the color "4", GrADS default colors instead of the png are rendered totally white. 

In summary, if the latitude and longitude are set very small, and in that region the value is for example always 100, GrADS renders a pgn with white background. 

Have you any idea how to fix it? 

Luca 

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