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20020401: Contour Question

James,

To create a grid file of surface or upperair data for
use with the full range of gridded data programs in GEMPAK,
first create a grid file for the data to be placed in using
the GDCFIL program.

Then, use the objective analysis programs OABSFC and OABSND
for surface and upperair data respectively to perform a 
Barnes analysis to interpolate the data to grid point locations.

Finally, you can access your gridded parameters in the GD programs.

More information about this process can be found in the online
tutorial:
http://www.unidata.ucar.edu/packages/gempak/tutorial/barnes.html

Additionally, I provided a surface program SFCNTR to provide a
quick way of contouring some surface parameters through the
Barnes gridding routines and gdcntr display. However, the access
the full range of grid diagnostics of GFUNC/GPARM in the GD programs 
you have to run the OA routines to grid your data.

Steve Chiswell
Unidata User Support




>From: "James R. Kirk" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200204011517.g31FH5a10262

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>Greetings from Edinboro
>=20
>I am a professor at a small University in Edinboro PA working with John =
>Clark at Penn State University on research.  I use GEMPAK at Penn State. =
> I wanted to use GEMPAK to contour surface and upper air data that I =
>view using SNMAP and SFMAP.  I presume I need to create a new file that =
>will convert the actual data to gridded data that can be contoured using =
>GDPLOT.  Is there a GEMPAK program that will do this?  If not, how can I =
>contour the data in the surface and upper air gempak files?
>
>Jim Kirk
>address@hidden
>
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><DIV>
><DIV><FONT color=3D#000000 size=3D2>Greetings from Edinboro</FONT></DIV>
><DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
><DIV><FONT color=3D#000000 size=3D2>I am a professor at a small =
>University in=20
>Edinboro PA working with John Clark at Penn State University on =
>research.&nbsp;=20
>I use GEMPAK at Penn State.&nbsp; I wanted to use GEMPAK to contour =
>surface and=20
>upper air data that I view using SNMAP and SFMAP.&nbsp; I presume I need =
>to=20
>create a new file that will convert the actual data to gridded data that =
>can be=20
>contoured using GDPLOT.&nbsp; Is there a GEMPAK program that will do =
>this?&nbsp;=20
>If not, how can I contour the data in the surface and upper air gempak=20
>files?</FONT></DIV>
><DIV>&nbsp;</DIV>
><DIV><FONT color=3D#000000 size=3D2>Jim Kirk</FONT></DIV>
><DIV><FONT color=3D#000000 size=3D2><A=20
>href=3D"mailto:address@hidden";>address@hidden</A></FONT></DIV></D=
>IV></BODY></HTML>
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