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[GEMPAK #ZIZ-192685]: Re: 20060123: bugs in gdprof and gdpoint
- Subject: [GEMPAK #ZIZ-192685]: Re: 20060123: bugs in gdprof and gdpoint
- Date: Thu, 09 Mar 2006 16:18:34 -0700
>To be honest, I am still puzzled by your response to this issue, which
>I finally have time to study once again. My basic assertion is that
>GDPROF and GDPOINT give wrong answers for wind speeds and directions
>because they do not use interpolated wind components (even though
>GDPROF will display them for you).
David,
The key here is, as you noted, that the GFUNC scalar calculation
involving a vector has correct values at the grid points, but not at the
interpolated gpoint location where the resultant value is interrpolated from
the surrounding
grid point values after the scalar field is calculated, rather than
interpolating
the components individually to the desired point and then performing the
calculation
of the scalar quantity.
As I noted previously, one solution is to interpolate the grid points first
which can now be
done through the new grid library interface.
I have reposted the 5.9.1 distribution tarfiles, both source and binary
versions,
which implement a method whereby the grid is translated so that the GPOINT
location
is colocated with the grid point- so that the component values are interpolated
to the location first, and then the scalar value is obtained. These tar files
will have a
posting data of March 9 on the web portal.
Steve Chiswell
Unidata User Support
Ticket Details
===================
Ticket ID: ZIZ-192685
Department: Support GEMPAK
Priority: Urgent
Status: Closed