Re: high-res map with gsn_panel

From: Mary Haley <haley_at_nyahnyahspammersnyahnyah>
Date: Thu, 12 Mar 2009 16:55:28 -0600 (MDT)

Well, Joe, I learn something new every day!

Dave Brown sent me an email explaining that the high-resolution
map database actually has several levels of resolution itself.

Apparently, the default is to determine which resolution to use based
on the size of your plot. That's why you were getting different
results when you paneled your plots.

Dave pointed out a resource, "mpDataResolution", that allows you to
specify which resolution you want out of the "HighRes" map
database. (The default is "UnspecifiedResolution" which means NCL
determines the value dynamically.)

The other five possible values are:

     "Finest" - Draw the map using the finest resolution possible.
     "Fine" - Draw the map using fine resolution.
     "Medium" - Draw the map using medium resolution.
     "Coarse" - Draw the map using coarse resolution.
     "Coarsest" - Draw the map using the coarsest resolution possible.

You only want to use "Finest" and maybe "Fine" when you are zoomed in
pretty far with the map. In your case, start with "Coarse" and work
your way up.

I'll add some examples on this.


On Thu, 12 Mar 2009, Mary Haley wrote:

> Hi Joe,
> We were able to reproduce this problem.
> It seems to happen when the plot gets smaller, and that's why when you
> paneled the plots, you weren't seeing the outlines. You might try
> making the plots bigger in the panel, like decreasing the white space
> around each plot (set pres_at_gsnPanelXWhiteSpacePercent and
> pres_at_gsnPanelYWhiteSpacePercent to 0.0).
> Meanwhile, I'll try to get more information for you, like a better
> work-around or a fix.
> As for minor ticks on a Mercator plot, I'm afraid this is not currently
> possible.
> --Mary
> On Thu, 12 Mar 2009, Joe Patiani wrote:
>> Hi everyone,
>> I've been trying to plot some contour map with high resolution using the gsn_panel. The map was drawn in really high-res if only one plot in panel, but when I add another plot in panel the map not in high-res anymore. Is it normal or there is something unusual?.
>> Another question, is the minor tick mark using Mercator projection still not supported yet?.
>> I use NCL version 5.1. The NCL script and result are also attached in this email.
>> Thank you.
>> Best regards.
>> _______________________________________
>> Weather and Climate Prediction Laboratory
>> Atmospheric Science Research Group
>> Faculty of Earth Sciences and Technology
>> Institut Teknologi Bandung
>> Labtex XI 2nd floor
>> Jl. Ganesha 10 Bandung 40132 Indonesia
>> Email :
>> Phone : +62 (22) 2509173 ext 3187
>> _______________________________________
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Received on Thu Mar 12 2009 - 16:55:28 MDT

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