[ncl-talk] Convert polar streographic coordinates to lat/lon grid

Sourav Chatterjee srvsxc at outlook.com
Mon Sep 12 11:02:17 MDT 2016

```Thank you

________________________________
From: Dennis Shea<mailto:shea at ucar.edu>
Sent: ‎12-‎09-‎2016 16:50
To: Sourav Chatterjee<mailto:srvsxc at outlook.com>
Cc: ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] Convert polar streographic coordinates to lat/lon grid

You have sent the same question before, The reason for no reply is that the question is rather vague.

[1] You can read the variable and use the two-dimensional coordinates latitude(y,x) ; longitude (y,x) to plot vis:

x = f->X                          ; :(time,lev,y,x)
x at lat2d = f->latitude      ; (y,x)
x at lon2d = f->longitude

wks = gsn_open_wks("png","polar")              ; send graphics to PNG file
res            = True                          ; plot mods desired
res at gsnPolar   = "NH"                          ; specify the hemisphere

nt  = 0
lev = 10
plot = gsn_csm_contour_map_polar(wks,x(nt,klev,:,:),res)

or, maybe

plev = 500   ; natural coordinate
plot = gsn_csm_contour_map_polar(wks,x(nt,{plev},:,:),res)

===

[2]
If you want the polar data regridded then see:
http://www.ncl.ucar.edu/Applications/ESMF.shtml

Your source grid would be classified as 'curvilinear'.

Your resulting file would ve 'rectilinear'

Good luck

On Mon, Sep 12, 2016 at 4:00 AM, Sourav Chatterjee <srvsxc at outlook.com<mailto:srvsxc at outlook.com>> wrote:

Dear All

How to convert the stereographic projection x-y coordinates to lat lon grids? I have the 2d lat lon coordinates but the variable is in x-y coordinates e.g

temp(time,depth,y,x).

and latitude(y,x) ; longitude (y,x)

Is it poosible to get temp(time,depth,latitude,longitude) from this information?

Thanks

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