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Re: [ferret_users] Save grid area [nlon,nlat] to file?
Isn't that what XBOX and YBOX do?
I guess you'd have to scale by cos(latitude) if your grid is in degrees.
let pi=4*atan(1)
let cell_area =
xbox[g=gridname]*ybox[g=gridname]*cos(pi*y[gy=gridname]/180)
BK
On Sep 13, 2011, at 2:52 PM, Paul Young wrote:
Hi all,
I've seen that there are several entries in the archives about
saving the area for a particular region (using @din; e.g. http://www.pmel.noaa.gov/maillists/tmap/ferret_users/fu_2004/msg00026.html)
, but is there a simple way to return a variable that is dimensioned
(nlon, nlat) and has the the grid cell areas for each cell? Else, do
I need to step through and do the geometry myself?
I'm looping through a bunch of different models (perhaps some on
spectral grids) and I'd like to have a generic script. I'm
envisaging something like:
use "var_for_model_X.nc" !Load in any variable on the
model grid (e.g. surface pressure: lon, lat, time)
let cell_areas = { something clever in one/two lines! } !
Calculate areas [lon,lat]
save/file="cell_areas_for_model_X.nc" cell_areas !Save them to
netcdf
I bet the solution is very simple and staring me in the face, but -
as I can't see it - please forgive me for crowd-sourcing from the
help list.
Cheers,
Paul
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