[ncl-talk] lat,lon not accurately generated by NCL

[Craig Mattocks]

Sure thing, glad to help, Guoqing!

Both the proj commands and the Java code (which I modified to make it more efficient and easier to test) on that web site work as advertised.

Craig

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Dr. Craig A. Mattocks
Meteorologist, NWP Modeler, Software Developer
Technology and Sciences Branch (TSB)
NOAA/NWS/NCEP National Hurricane Center
11691 SW 17th St.
Miami, FL 33165-2149
(305) 229-4431
Craig.Mattocks at noaa.gov
http://www.nhc.noaa.gov
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> On Jul 31, 2018, at 3:57 PM, Guoqing Ge - NOAA Affiliate <guoqing.ge at noaa.gov> wrote:
> 
> Hi Craig,  thanks a lot for your sharing this note and the "proj.4" information. It really helps. 
> 
> Best,
> 
> Guoqing
> 
> --
> Guoqing Ge, PhD
> CIRES Research Scientist
> at NOAA/ESRL/GSD (Rm 2B502)
> 325 Broadway, Boulder, CO 80305
> (303)497-4163
> &
> Thursdays at
> Developmental Testbed Center (FL3-1039)
> 3450 Mitchell Ln, Boulder, CO 80301
> (303)497-8445
> 
> 
> 
> On Tue, Jul 31, 2018 at 1:05 PM, Craig Mattocks <mattocks at mac.com> wrote:
> See this note about the dangers of transforming between geocentric (spherical) and geodetic (ellipsoidal) coordinate systems (especially the difference in latitudes):
> 
> http://www.pkrc.net/wrf-lambert.html#_footnote_2
> 
> Transform from Lambert conic conformal to spherical lat,lon first to avoid errors.
> 
> Note: I believe NCL uses proj.4 for map projections.
> 
> We’ve been fighting a similar issue in AWIPS II.
> 
> Craig
> 
> On Mon, 30 Jul 2018 12:32:22 -0600, Guoqing Ge - NOAA Affiliate <guoqing.ge at noaa.gov> wrote:
> 
> > Recently, I found an issue on the generation of grid meshes using a
> > prescribed map projection information.
> 
> 
> 
>