Re: Arrow on map?

From: Mary Haley (haley AT ucar.edu)
Date: Fri Sep 30 2005 - 09:59:32 MDT

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    Hi Andrea,

    By default, the coordinates passed to wmlabs indicate NCL data units
    (which I honestly don't know what the documentation means by this),
    and not map units. In order to see weather map labels on your plot,
    you need to set the EZF parameter to "1" to indicate this is over
    a map:

       wmsetp("ARD",90.)
       wmsetp("ARS",0.1)
       wmsetp("EZF",1)
        ...
       wmlabs(...)

    Cheers,

    --Mary

    On Fri, 30 Sep 2005, Andrea Hahmann wrote:

    > Hi!
    >
    > I have been trying to draw an arrow on a map without success. I have set
    > mpFillDrawOrder = "PreDraw", but the map still seems to cover my arrow. Could
    > it have something to do with the projection perhaps?
    >
    > Below is my ncl script. Help will be greatly appreciated.
    > Thanks
    > Andrea
    >
    > load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
    > load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
    >
    > begin
    > wks = gsn_open_wks("x11","arrow") ; open a workstation
    >
    > res = True
    > res@gsnDraw = False
    > res@gsnFrame = False
    >
    > res@mpProjection = "Stereographic"
    > res@mpCenterLonF = 23.
    > res@mpCenterLatF = 90.
    > res@mpLimitMode = "Corners"
    > res@mpLeftCornerLatF = 37.7823
    > res@mpLeftCornerLonF = 23.4808
    > res@mpRightCornerLatF = 38.2082
    > res@mpRightCornerLonF = 24.1032
    > res@mpFillOn = False
    > res@mpFillDrawOrder = "PreDraw"
    >
    > plot = gsn_csm_map_ce(wks,res) ; draw map
    >
    > wmsetp("ARD",90.)
    > wmsetp("ARS",0.1)
    > x = 38.0 ; lon
    > y = 23.8 ; lat
    > wmlabs(wks, x, y, "ARROW")
    >
    > draw(plot)
    > frame(wks)
    >
    > end
    >
    >
    > ----------------------------------------------------------------
    > Andrea N. Hahmann, Ph.D.
    > Research Applications Laboratory
    > Natl. Center for Atmospheric Research Phone: 1-303-497-8383
    > PO BOX 3000 Fax: 1-303-497-8401
    > Boulder, CO 80301 hahmann@ucar.edu
    > ----------------------------------------------------------------
    >
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