> I need to interpolate WRF data on native Mercator projection to the x,
> y, z Cartesian coordinates. Please let me know whether or not NCL can do this
> and how. Thank you.
>
The question is a bit open-ended.
(1) If you want "cartesian" relative to the plot frame, you
could use the function "datatondc"
http://www.ncl.ucar.edu/Document/Functions/Built-in/datatondc.shtml
However, I do not think this is what you want.
(2) I think the "gc_latlon" function could be used
http://www.ncl.ucar.edu/Document/Functions/Built-in/gc_latlon.shtml
The following uses the equator as the "origin"
You could then write the x and y coordinates to a file.
I will request that the gc_latlon function be
made to operate on arrays. That will speed things up.
begin
f = addfile("wrfout_d01_2003-07-13_12:00:00.nc", "r")
lat1d = ndtooned( f->XLAT(0,:,:) )
lon1d = ndtooned( f->XLONG(0,:,:))
npts = dimsizes( lat1d )
lato = 0.0 ; origin
lono = 0.0
x = new ( npts, "float")
y = new ( npts, "float")
do n=0,npts-1
x(n) = gc_latlon(lato,lono, lato ,lon1d(n), 2,3) ; x-axis
y(n) = gc_latlon(lato,lono, lat1d(n),lono , 2,3) ; y-axis
if (lon1d(n).lt.0) then
x(n) = -1*x(n)
end if
if (lat1d(n).lt.0) then
y(n) = -1*y(n)
end if
print(lat1d(n)+" "+lon1d(n)+" "+x(n)+" "+y(n))
end do
end
HTH
D
_______________________________________________
ncl-talk mailing list
ncl-talk_at_ucar.edu
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Mon Jan 30 2006 - 21:50:21 MST
This archive was generated by hypermail 2.2.0 : Tue Jan 31 2006 - 14:26:26 MST