Re: Coastline Data - Ronne Ice Shelf

All,

We are hoping to release a new version of NCAR Graphics (bundled with
NCL) in November. This will contain the new map databases that
Dave mentions below.

--Mary

On Thu, 2 Oct 2008, David Kennison wrote:

>
> Jeff,
>
> The Ronne ice shelf was included as part of Antarctica proper in the USGS
> dataset that I used as a starting point in creating "Earth..1", "Earth..2",
> and "Earth..3" and I had no good way to create the necessary boundary line
> separating it from the continent.
>
> I recently created an "Earth..4" which, among other things, includes boundary
> lines for all the major ice shelves, including the Ronne, and makes it
> possible to include them or exclude them at will (though I have not yet
> created an example showing how to do that from NCAR Graphics, because I got
> side-tracked on other things).
>
> I could not find sources of digital data for the ice shelves, so, eventually,
> I worked out a way to display the Blue Marble satellite image of Antarctica
> as a background for the display in my database editor and then essentially
> free-handed the desired ice-shelf outlines. In the case of the Ronne and the
> Ross, it was a bit difficult to determine just where some portions of the
> outlines ought to go - and, in fact, comparing different maps of Antarctica
> reveals that different map makers have created different versions of these
> portions.
>
> I also used the National Geographic map of Antarctica as a guide, but, since
> it is available to me only in paper form, my use of it amounts to eye-balling
> my outlines to make sure that they are not grossly different from NG's.
>
> Mary can tell you when "Earth..4" will be officially released.
>
> Dave Kennison
>
> On Sep 30, 2008, at 1:09 PM, Jeff Jonas wrote:
>
>> Hey Folks,
>>
>> Some scientists I work with have commented that the coastline around
>> Antarctica (South Pole), that I draw with NCAR Graphics, includes the
>> Ronne ice shelf as part of that coastline. They were suggesting that this
>> was probably a mistake, and wanted to know if I had a coastline map
>> that did not include the Ronne ice shelf.
>>
>> Has anyone else been questioned about this ??
>>
>> Is there a way to omit the Ronne ice shelf from the NCAR Graphics
>> coastline map drawing ?? When I examined the control labels for the
>> area around Antarctica, I saw no reference to it in the EZmap area
>> identifiers. Just references to islands around Antarctica.
>>
>> Also, what was the source for the NCAR Graphic's coastline map ??
>>
>> Thanx all !
>> Jeff
>> --
>> Jeffrey Jonas
>> NASA/GISS at Columbia University
>> jjonas_at_giss.nasa.gov
>> (212) 678-5532
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>
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Received on Wed Oct 08 2008 - 10:06:11 MDT