Re: how to plot CCSM-T85 gird lines

Hi Sanjiv,

You don't have much control over the map lat/lon lines, other than to
indicate the spacing. And, because of this, I think NCL tries to use
"nice" values, like 15, 30, 45, etc, rather than decimal values like
15.4, 16.2, etc.

As another bit of information: the map lat/lon lines being drawn
have nothing to do with the map tickmarks and their labels. That's
why they don't necessarily line up.

I think what you want to do here is not use the map lat/lon lines, but
instead, use grid lines from the tickmarks.

I've shown you below how to set the begin and end tickmarks,
with a spacing. In addition, you should be able to get
grid lines by setting:

   res_at_tmXMajorGrid = True
   res_at_tmYMajorGrid = True

You can further set a dash pattern for each:

   res_at_tmXMajorGridLineDashPattern = 2
   res_at_tmYMajorGridLineDashPattern = 2

There are a few other grid line resources. See:

    http://www.ncl.ucar.edu/Document/Graphics/Resources/tm.shtml

for a list (search on "tmXMajor" or "tmYMajor").

--Mary

On Mon, 19 Jan 2009, Sanjiv Kumar wrote:

> Mary,
>
> Thanks for your valubale suggestion. This will certainly improve my
> graphics.
>
> My question was slightly different, i have attempted to clarify my question
> in the attached pdf. Here you can see grid lines (@1.4 degree) as drawn by
> ncl (dotted) lines is not matching with CCSM gird lines (black thick lines)
> particularly in the longitudinal direction (I have inserted the CCSM grid
> lines as black thick line in the power point and the converted into pdf
> document)
>
> I tried to find the similar resource as you mentioned for tickmarks, but i
> could not. Can we set the similar resource for grid lines where i can start
> grid lines at given longitude and latitude, then it might follow the CCSM
> gird lines?
>
> Thanks
> Sanjiv
>
>
>
>
>
>
>
>
> On Fri, Jan 16, 2009 at 4:17 PM, Mary Haley <haley_at_ucar.edu> wrote:
>
>>
>> Sanjiv,
>>
>> I assume you are talking about the tickmarks not lining up with
>> the lat/lon dotted lines?
>>
>> If so, then you can try setting the tickmarks explicitly:
>>
>> res_at_pmTickMarkDisplayMode = "Always"
>> res_at_tmYLMode = "Manual"
>> res_at_tmYLTickStartF = 36.4
>> res_at_tmYLTickEndF = 49.0
>> res_at_tmYLTickSpacingF = 1.4
>>
>> You need to do a similar thing for the tm*XB* resources.
>>
>> Let me know if this doesn't work.
>>
>> --Mary
>>
>>
>> On Fri, 16 Jan 2009, Sanjiv Kumar wrote:
>>
>> Hi,
>>>
>>> Please see the pdf plot attached. Where, i plotted the contour plot for US
>>> Midwest area from CCSM output.
>>> If you see the gird lines (@1.4 degree spacing), it is not matching with
>>> the
>>> CCSM grid lines.
>>>
>>> My question is: How to plot CCSM-T85 grid lines that exactly matches with
>>> the raster boundary also.
>>>
>>> I am also attaching the script i used.
>>>
>>> Thanks
>>> Sanjiv
>>>
>>>
>
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Received on Tue Jan 20 2009 - 14:58:28 MST