[ncl-talk] How to define XY Labels manually (gsn_csm_contour_map)

[Guido Cioni]

That method didn't work for me sometimes as it was complaining because the variable that I was plotting had lat/lon attributes attached. But it should work most of the times.
Cheers

> On 17 May 2017, at 12:55, Karin Meier-Fleischer <meier-fleischer at dkrz.de> wrote:
> 
> Hi Cunbo and Guido,
> 
> the simple way to do that is:
> 
>   xvalues = (/ -10,     -5,     0,     5,     10/)
>   xlabels = (/"-10km", "-5km", "0km", "5km", "10km"/)
>  
>   res at tmXBMode   = "Explicit"        ;-- set x-axis labeling to explicit
>   res at tmXBValues =  xvalues          ;-- values for x-axis tickmarks
>   res at tmXBLabels =  xlabels          ;-- set labels equal to values (type string)
>   
> Bye,
> Karin
> 
> Am 17.05.17 um 09:45 schrieb Guido Cioni:
>> Hey Cunbo,
>> that's a problem that I faced many times and I haven't found a clean solution, yet. All the methods that I've used to manually define the labels have failed somehow. The "easy" solution that I'm using now is to define a new variable for your axis and then use that for plotting.
>> 
>> I believe you also have, like me, some coordinate informations in the x and y axis although the domain is idealized, that is defined only in terms of grid resolution, right? So what I've done was:
>> 
>> ; 1 - defining the half-lenght of the two axis (in your case 10 km)
>> half_lenght_x=10.
>> half_lenght_y=10.
>> 
>> ; 2 - manually compute the two axis as km
>> ; using the longitude and latitude arrays from
>> ; your input File
>> 
>>  dist_x:=(half_lenght_x/180.)*(File->lon)
>>  dist_x at units= "km"
>>  dist_x at long_name = "Distance"
>>  dist_x at standard_name = "distance"
>> 
>>  dist_y:=(half_lenght_y/90.)*(File->lat)
>>  dist_y at units= "km"
>>  dist_y at long_name = "Distance"
>>  dist_y at standard_name = "distance"
>> 
>> ; 3 - use these two variables, which will have the same dimension as the coordinate variables, to plot
>>  ResC at sfXArray := dist_x
>>  ResC at sfYArray := dist_y 
>> 
>> Note that you will need to remove any reference to the old coordinate variables from the variable that you're plotting (so any attribute...).
>> 
>> Hope that helps
>> 
>>> On 17 May 2017, at 09:28, Cunbo HAN <hancbo at gmail.com <mailto:hancbo at gmail.com>> wrote:
>>> 
>>> Dear ncl-talk,
>>> 
>>> I am doing a contour plot with “gsn_csm_contour_map” and I want to setup XY labels manually. Like in the attached plot, how can I change the XBLabels “10w, 5w, 0, 5E, 10E” to “-10km, -5km, 0km, 5km, 10km “? Does anyone know how to modify this? Thanks very much!
>>> 
>>> Best,
>>> Cunbo
>>> 
>>> 
>>> <icon_shfx_50m_2d.png>
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>> 
>> 
>> Guido Cioni
>> http://guidocioni.altervista <http://guidocioni.altervista/>.org
>> 
>> 
>> 
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Guido Cioni
http://guidocioni.altervista <http://guidocioni.altervista/>.org

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