Re: About masking using RANGS_GSHHS database.

By default, gsn_csm_contour_map draws land as filled and ocean
transparent, but you can do the reverse by adding the following
resource settings:

    res@mpOceanFillColor = "gray"
    res@mpLandFillColor = "transparent"

Good luck.
  -dave

On Jan 13, 2010, at 6:03 PM, ¼B©¨ªY wrote:

> Hi,
>
> I have tried the example below to mask land and it works.
> But what about if I want to mask ocean (instead of land)?
> (of course, at the same situation as Jerry, I am using RANGS_GSHHS
> database)
>
>
> > Hi,everyone,
> >
> > I have a 2D distributed grid dataset.
> > And also, trying to mask land data in using RANGS_GSHHS database.
> > But,NCL doesn't seem to support RANGS database in "mpAreaMasking".
> >
> > Does anyone know how to mask land in RANGS_GSHHS database with 2D
> data?
> Hi Jerry,
> You can get around the problem of not being able to use
> mpAreaMasking with the RANGS database by using the DrawOrder
> resources, or by drawing various pieces of your maps and contours
> one at a time, in the order you want to mask the other.
> For example, if you are just trying to mask land, and you are using
> one of the gsn_csm_xxxx functions, then you can use the
> cnFillDrawOrder resource, and set it to "PreDraw". This will cause the
> filled contours to be drawn before the filled map, and since he land
> part of the map is filled and the ocean part is left transparent, you
> will still see the contours over the ocean.
> Here's a short example:
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> begin
> f = addfile("$NCARG_ROOT/lib/ncarg/data/cdf/contour.cdf","r")
> t = f->T(0,0,:,:)
> wks = gsn_open_wks("x11","map")
> res = True
> res@gsnAddCyclic = False
> res@cnFillOn = True
> res@cnFillDrawOrder = "PreDraw"
> res@mpDataBaseVersion = "HighRes"
> res@mpMinLatF = 20.
> res@mpMaxLatF = 50.
> res@mpMinLonF = -110.
> res@mpMaxLonF = -60.
> plot = gsn_csm_contour_map(wks,t,res)
> end
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Received on Wed Jan 13 18:34:04 2010