[ncl-talk] rangs database - northern latitude oddity

[Mary Haley]

The RANGS database does not work for global data.  Our documentation didn't
make this clear, which I've tried to fix.

If you really want better coastlines for global data, I suggest first
trying:

  res at mpDataBaseVersion = "MediumRes"

If this doesn't give you want you need, then I suggest using shapefiles.
You can get the GSHHS/RANGS data base as a shapefile from:

http://www.ngdc.noaa.gov/mgg/shorelines/data/gshhg/latest/

Then use "gsn_add_shapefile_polylines" to attach the shapefile outlines to
your plot.  There are several shapefiles provided in the zipped file, so
you'll have to look at the README file to decide which one you want.

I've attached an NCL script that you can use to compare three different
sets of map outlines.

--Mary


On Fri, Oct 31, 2014 at 10:56 AM, Kyle Griffin <ksgriffin2 at wisc.edu> wrote:

> Hi Micah,
>
> I don't know the specifics of how the RANGS maps are drawn, but I wonder
> if this change in 6.2.0 has something to do with it? I might be completely
> off-base here as well.
> http://ncl.ucar.edu/prev_releases.shtml#ChangesToMapDrawingBehavior6.2.0
>
>
> Kyle
>
> ----------------------------------------
> Kyle S. Griffin
> Department of Atmospheric and Oceanic Sciences
> University of Wisconsin - Madison
> Room 1421
> 1225 W Dayton St, Madison, WI 53706
> Email: ksgriffin2 at wisc.edu
>
> On Fri, Oct 31, 2014 at 11:51 AM, Micah Sklut <micahs2005 at gmail.com>
> wrote:
>
>> I noticed, when using the RANGS coastline database, I see some odd things
>> in the northern latitudes (white lines that go across the globe. I am
>> plotting a Mercator projection. In contrast, when I plot using Ncarg_1,
>> everything looks normal.
>>
>> Please see the attached image. I am doing a mapFill in white over the
>> data. Please see the attached image.
>>
>> --
>> Micah Sklut
>>
>>
>> _______________________________________________
>> ncl-talk mailing list
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>>
>
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20141031/e3f1d1ec/attachment.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: mapcompare_shp.png
Type: image/png
Size: 61695 bytes
Desc: not available
Url : http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20141031/e3f1d1ec/attachment.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: mapcompare.ncl
Type: application/octet-stream
Size: 1302 bytes
Desc: not available
Url : http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20141031/e3f1d1ec/attachment.obj