On 11/24/12 10:08 AM, Tom Roche wrote:
>
> Tom Roche Wed, 21 Nov 2012 23:30:42 -0500
>>> I'm trying to select the appropriate method(s) for regridding gas
>>> concentrations from a global 3D grid (coordinates=longitude,
>>> latitude, sigma) to a regional 3D grid (coordinates=col, row, sigma)
>>> on a Lambert Conformal Conic (LCC) projection over North America with
>>> 12-km horizontal resolution.
>
>>> I suspect my difficulty is at least in part due to my uncertainty
>>> regarding definitions of some terms as used in the NCL docs. (It may
>>> also be due to my being totally confused :-) My global input grid is
>>> pretty clearly spherical and curvilinear (no?)
>
> Dennis Shea Fri, 23 Nov 2012 08:47:30 -0700
> (rearranged, from another thread)
>> [2] The global is (likely) rectilinear [in NCL parlance.]
>
> Really? Lon-lat is rectilinear?
Like I said "NCL parlance" ...
Logically rectilinear. Any grid that can be described by a
coordinate variable which, by definition, is a one dimensional
monotonically {in/de}creasing numeric array [eg: lat(lat) , lon(lon) ]
is a rectilinear array.
>
>>> I'm [even] less certain about the terms to use regarding my regional
>>> output grid: Does NCL consider a 3D LCC grid "Cartesian"? [...] If
>>> not Cartesian, I'm assuming a 3D LCC grid is at least considered
>>> rectilinear. If a 3D LCC grid is *not* considered rectilinear, I am
>>> very confused, and would appreciate an explanation.
>
>> [1] The LCC is curvilinear in NCL parlance.
>
> OK, I am very confused--this is the opposite of what I assumed.
In NCL parlance, any grid where grid points are uniquely described
by two dimensional arrays, eg, LAT(ny,ny) and LON(ny,nx) is called
curvilinear.
>
> Is LCC at least "Cartesian"? That matters to me, because I'd like to do
> the 3D regridding with ESMF_regrid, but
Once the weight file is generated,
NCL's ESMF regridding operations will regrid any dimensional grid
(:,:) , (time,:,:), (time,lev,:,:), (case,time,lev,:,:)
with one call
http://www.ncl.ucar.edu/Document/Functions/ESMF/ESMF_regrid_with_weights.shtml
>
> Subject: [3587543] 3D regridding from spherical coordinates to Cartesian coordinates?
> From: Robert Oehmke <robert.oehmke@noaa.gov>
> Date: Fri, 16 Nov 2012 10:57:49 -0700
> Cc: esmf_support <esmf_support@list.woc.noaa.gov>
>
>>>> [ESMF] currently only [supports] regridding between source and
>>>> destination grids with the same coordinate space (e.g. from
>>>> Cartesian to Cartesian [or spherical to spherical]).
>
> Thanks for your assistance, Tom Roche <Tom_Roche@pobox.com>
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Received on Sat Nov 24 16:27:18 2012
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