Re: Plotting Antarctica

From: Mary Haley <haley_at_nyahnyahspammersnyahnyah>
Date: Wed Feb 23 2011 - 10:10:12 MST

Hi Rosemarie,

I'm sorry, I didn't realize the Earth..3 was giving ice shelves, because it doesn't appear to be documented this way in the Earth..3 table.

However, I think you can get the outlines for Antarctic only in Earth..4. I'm extremely busy right now, so I don't have time to write out a full script to try this, but what happens if set these resources? The last one is the important one:

  res@gsnPolar = "SH" ; Southern hemisphere

  res@mpDataSetName = "Earth..4" ; Database that contains the
  res@mpDataBaseVersion = "MediumRes" ; ice shelves
  res@mpMaxLatF = -60 ; Zoom in on Antarctica
  res@mpOutlineOn = True ; Turn on map outlines
  res@mpFillOn = False ; Turn off map fill
  res@mpGridAndLimbOn = False ; Turn off grid and limb lines
  res@mpPerimOn = False ; Turn off map perimeter
  res@mpGeophysicalLineColor = "red"

  res@mpOutlineSpecifiers = "Land . Antarctica"


On Feb 23, 2011, at 9:41 AM, Rosemarie Drummond wrote:

> Hi Mary,
> I am afraid that my experience does not agree with you. I am attaching 2 plots of the Antarctic peninsula.
> The contoured field is a rather coarsely-defined plot of current topography.
> The outline given by Earth..3 has a lot of blue within the boundary because the outline goes along the edge of the ice-shelf. (in particular the blue area at the bottom of the plot is the Ronne iceshelf)
> The outline given by Earth..4 is much more complex and is showing the edge of the Ronne icesheet and the edge of the land beneath the iceshelf.
> The documentation you referred me to says that the ice shelves "can be made to appear or not as desired". I assume that this might perhaps be done with mpOutlineSpecifiers, so I will look into that.
> Rosemarie
> PS In case anyone else plots Antarctica: Using LowRes gives inconsistent results showing the outer edge of the Ronne iceshelf and the land edge under the Ross iceshelf
> On 23/02/2011 10:44 AM, Mary Haley wrote:
>> Rosemarie,
>> I believe the Earth..3 database should be giving you the edge of the land, and not the ice shelves.
>> If you go to the page that lists all the areas for Earth..3, you won't see any mention of ice shelves:
>> On the Earth..4 page, however, you do:
>> --Mary
>> On Feb 22, 2011, at 12:44 PM, Rosemarie Drummond wrote:
>>> If I plot a map of Antarctica and specify mpDataBaseVersion = "Ncarg4_1"
>>> then if I set mpDataSetName = "Earth..3", it will plot the edge of the
>>> ice-shelves
>>> but if I set mpdataSetName = "Earth..4", it will plot both the edge of
>>> the land below the ice-shelves and the edge of the ice-shelves.
>>> I am just wondering if there is a combination that I have missed, that
>>> would just plot the edge of the land?
>>> Thanks
>>> Rosemarie
>>> PS I am using gsn_csm_contour_map_polar but I don't suppose that makes
>>> any difference in this.
>>> --
>>> Dr Rosemarie Drummond
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> --
> Dr Rosemarie Drummond
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Received on Wed Feb 23 10:10:19 2011

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