Re: Getting error when setting gsnMajorLatSpacing less than 1

Adam and Joeky,

I looked into this and originally had typed up a response that recommended mpGridSpacingF as Adam did here. But looking into the situation a little further, I discovered that gsnMajorLonSpacingF is actually a resource for tickmark spacing that seems to round any specified lat/lon value to the nearest degree. For example, I tried setting it to 1.4 and got tick spacing of
1 degree. So it apparently won't work for values less than 1 degree. mpGridSpacingF is for the lat/lon grid inside the map projected area and does work for values less than a degree.

gsnMajorLonSpacingF only applies when you are using the special tick marks that work only for lat/lon projections using the gsn routines. You could instead use the basic map tickmarks by
setting pmTickMarkDisplayMode to "always". This will give you tick marks for small areas of 1 degree or less. The downside is you have to accept what they give you -- which is degrees,
minutes, and seconds.
 -dave

On Mar 11, 2013, at 10:34 AM, Adam Phillips wrote:

> Hi Joeky,
> I am not sure about this as I cannot see the underlying code, but it sounds like those resources are not coded to work below a 1 degree resolution. You can try setting this resource:
> res@mpGridSpacingF = 0.1
> http://www.ncl.ucar.edu/Document/Graphics/Resources/mp.shtml#mpGridSpacingF
>
> If that doesn't work then the best work around would be to add the grid lines manually using gsn_add_polyline:
> http://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_add_polyline.shtml
> Hope that helps.. If not, let ncl-talk know.
> Adam
>
>
> On 03/10/2013 10:06 AM, juki juki wrote:
>> Hi all ncl user;
>>
>> Again, I would like to share my problem and hope your advice on it. I am making a contour map for 1^ox1^o degree box. Of course, the latitude and longitude space will be < 1. I tried as
>>
>> res2gsnMajorLatSpacing =0. 1
>> res2@gsnMajorLonSpacing = 0.1
>>
>> and I got the following error:
>>
>> > fatal:divide: Division by 0, Can't continue
>> > fatal:Mod: operator failed, can't continue
>>
>> When I use the value > 1, everthing was ok. Thanks for your help
>>
>> Joeky
>>
>>
>>
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> --
> ______________________________________________________________
> Adam Phillips asphilli@ucar.edu
> NCAR/Climate and Global Dynamics Division (303) 497-1726
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Received on Mon Mar 11 11:26:14 2013