[ncl-talk] New York Map issue(s)

Tue Feb 21 00:15:58 MST 2017

Hi Bassill:

How do you mask the incorrect western boundary?

Barry

On Mon, Feb 20, 2017 at 4:57 PM, Bassill, Nicholas <nbassill at albany.edu>
wrote:

> Hi Rick,
>     Thanks for the reply. I guess I must have missed that masking doesn't
> work with the high-res datasets, so sorry about that.
>
> I've played around with shapefiles a little, but in our case we're
> interested in making some production-quality images pretty much in
> real-time, so the issue of "missing" data near the state boundaries is kind
> of a deal-breaker. Since all we care about is plotting the data, I think
> the best bet for the moment is to mask with medium-res, and interpolate our
> data to the correct western NY boundary so that the incorrect portion does
> not plot. Something like this: http://www.atmos.albany.
> edu/facstaff/nbassill/live/regularmercator.png
>
>
> Nick Bassill, PhD
>
> Modeler & Meteorologist, New York State Mesonet
>
> LC SB-28, 1400 Washington Ave.,
>
> SUNY, University at Albany, NY 12222
> (518) 442-6375
>
> http://nysmesonet.org/
>
>
> ------------------------------
> *From:* Rick Brownrigg <brownrig at ucar.edu>
> *Sent:* Friday, February 17, 2017 5:24 PM
> *To:* Bassill, Nicholas
> *Cc:* ncl-talk at ucar.edu
> *Subject:* Re: [ncl-talk] New York Map issue(s)
>
> Hi Nicholas,
>
> Yes, you are right about the western border issue:  attached is a plot
> showing NCL's border (in white), and the Shapefile's border (in red).
> (this map was very quickly put together, please ignore the lack of
> esthetics).  I'm not sure we can do anything about that in the short term.
> I'll file a bug report.
>
> As for the second issu, the docs do explicitly state that NCL's builtin
> masking functions do not work with the HighRes/RANGS map databases.
>
> However, for both purposes, state boundaries and masking, you might want
> to consider using a shapefile as a source.  Check out the examples page for
> both a link to a good source of shapefiles, GADM, and for examples of how
> to use them to perform masking.
>
> http://ncl.ucar.edu/Applications/shapefiles.shtml
> NCL and Shapefiles <http://ncl.ucar.edu/Applications/shapefiles.shtml>
> ncl.ucar.edu
> Shapefiles. Shapefiles are a supported data format. in NCL, and hence can
> be read with addfile. Unlike other supported formats, however, a
> "shapefile" refers to a ...
>
>
>
> Hope this helps...
> Rick
>
> On Fri, Feb 17, 2017 at 8:59 AM, Bassill, Nicholas <nbassill at albany.edu>
> wrote:
>
>> Hi All,
>>     New subscriber, so bear with me here. Two things - (1) a likely bug,
>> and (2) a question. I'm using NCL 6.3.
>>
>>
>> (1) It appears that the state boundaries for New York are slightly off in
>> the far western boundary. I'm attaching an image (NY.png) that plots the
>> state of NY, but with data that is specifically limited by the *actual*
>> western border to demonstrate this.
>>
>>
>> The relevant map settings are:
>>
>>
>> res at mpDataBaseVersion           = "Ncarg4_1"
>> res at mpDataSetName               = "Earth..4"
>> res at mpFillAreaSpecifiers        = (/"Land", "Land:North America:United
>> States:Conterminous US:New York","Water"/)
>> res at mpSpecifiedFillColors       = (/"white","transparent",
>> "white"/)
>> res at mpInlandWaterFillColor      = 238
>> res at mpLandFillColor             = -1     ; transparent
>> res at mpOutlineOn                 = True
>> res at mpMaskOutlineSpecifiers =   (/"Land"/)
>> res at mpOutlineSpecifiers =   (/ "Land:North America:United
>> States:Conterminous US:New York"/)
>> res at mpDataBaseVersion = "MediumRes"
>>
>>
>> (2) Partially based off of that, and in an effort to have a more detailed
>> coastline, I decided to try the "HighRes" dataset. However, I am not able
>> to successfully do any masking. In this case I want *only* a fill in the
>> shape of NY. For this I'm attaching the dataset I'm using
>> (currenttemp.dat), the script I'm using (temp.ncl, based largely on
>> http://www.ncl.ucar.edu/Applications/Scripts/mask_8.ncl for the mask),
>> and a sample image (current.png).
>>
>> Any help with (2) would be greatly appreciated!
>>
>>
>> Nick Bassill, PhD
>>
>> Modeler & Meteorologist, New York State Mesonet
>>
>> LC SB-28, 1400 Washington Ave.,
>>
>> SUNY, University at Albany, NY 12222
>> (518) 442-6375
>>
>> http://nysmesonet.org/
>>
>> _______________________________________________
>> ncl-talk mailing list
>> ncl-talk at ucar.edu
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>>
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>

-- 
Barry H. Lynn, Ph.D
Senior Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20170221/e3503359/attachment.html 