[gradsusr] plot missing data

[Jennifer Adams]

GrADS will not draw anything when data are missing -- the areas where missing data are located will have the background color. For contouring around missing data, a border around the area of missing data that is one grid box wide will also not be drawn (because contouring routines need to know the gradient across a grid box). A better solution is to use 'set gxout grfill' so you can see clearly which grid boxes are defined and which are not. Many users often do a grfill plot, then overlay a shaded contour plot on top of that so you get the smoothness of the contours and the grfill underneath shows through only at the true edges of the valid data. 
--Jennifer

On Feb 22, 2013, at 3:02 AM, wendi harjupa wrote:

> Dear Sir/Madam
> 
> I want to ask about grads plotting.
> 
> I want to plot hourly data as a contour plot.
> But, the data is not full. I mean in one day data, only 5 hours data available.
> 
> my question, how to plot the missing data ? maybe by using different colour? 
> that I can inform to the readers that the data was missing ?
> 
> Now I am using "set ccols 0 9 14 4 11 5 13 3 10 7 12 8 2 6"
> 
> Do I have to change some numbers of my ccols?
> 
> Thank you very much.
> 
> Best regards,
> wendi
> 
> -- 
> -------------
> Wendi Harjupa. ST                                            
> Shimane University Graduate School of Engineering Sciences
> Department of Electronic Control Systems
> Remote Sensing Laboratory
> s119447
> Cellphone : +81-080-4268-6676
> email : wendi at rslab.riko.shimane-u.ac.jp
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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