20020610: McIDAS Grid Math Problem

>From: Arlene Laing <address@hidden>
>Organization: USF
>Keywords: 200206101945.g5AJjNJ02677 McIDAS GRDDISP

Hi Arlene,

>May I disturb you for a moment, please?

Absolutely no disturbance at all!

>I have encountered some problems
>with a GRDDISP command that I am running on some archived data.  See the
>McIDAS session log below.  Your assistance with solving the problem will
>be greatly appreciated.
>
>
>TFILE did OPEN on window 0
>REDIRECT ADD GRID* "/home/nnarvek/mcidas/data
>REDIRECT: Done
>DSINFO ALL TESTDATA
>
>        Dataset Names of Type: IMAGE in Group: TESTDATA
>
>Name         NumPos   Content
>------------ ------   --------------------------------------
>TEST         99999
>
>    No Datasets found of Type: POINT in Group: TESTDATA
>    No Datasets found of Type: VPROF in Group: TESTDATA
>
>        Dataset Names of Type: GRID  in Group: TESTDATA
>
>Name         NumPos   Content
>------------ ------   --------------------------------------
>GRIDS         9999    TEST GRID FILES
>
>    No Datasets found of Type: TEXT  in Group: TESTDATA
>    No Datasets found of Type: NAV   in Group: TESTDATA
>DSINFO -- done
>SF 1
>PTCON NEWDATA/06juneman.1 SEL='LEV 500; TIME 12' PARAM=Z[M] MAP=SEUS
>OUT=PLOT TESTDATA/GRIDS.1 PINT= 3 3
>Number of data points input to objective analysis:  46
>PTCON:  Done

OK, I think I see the problem here.  In order to both save the
objective analyis to a GRID file and produce the contour plot, you need
to specify the OUT=SPLOT TESTDATA/GRIDS.1 keyword sequence.  The
OUT=PLOT TESTDATA/GRIDS.1 only plots the grid values; it does not do
the save, so nothing will get written to TESTDATA/GRIDS.1.

>SF 2
>PTCON NEWDATA/10juneman.1 SEL='LEV 500; TIME 12' PARAM=Z[M] MAP=SEUS
>OUT=PLOT TESTDATA/GRIDS.1 PINT= 3 3
>Number of data points input to objective analysis:  42
>PTCON:  Done
>SF 3
>PTCON NEWDATA/16juneman.1 SEL='LEV 500; TIME 12' PARAM=Z[M] MAP=SEUS
>OUT=PLOT TESTDATA/GRIDS.1 PINT= 3 3
>Number of data points input to objective analysis:  47
>PTCON:  Done
>SF 4
>GRDDISP TESTDATA/GRIDS.1 MATH='(G1+G2+G3)/3' G1='GRID 1' G2='GRID 2'
>G3='GRID 3' MAP=SEUS OUT=PLO PINT=3 3
>GRDDISP: No grid found matching search conditions
>GRDDISP - done

GRDDISP didn't find any grids since none were written to TESTDATA/GRIDS.1.

>GRDLIST TESTDATA/GRIDS.1 NUM=ALL
>GRDLIST: No grid found matching search conditions
>GRDLIST - done
>GRDLIST TESTDATA/GRIDS
>GRDLIST: No grid found matching search conditions
>GRDLIST - done
>TFILE CLOSE "june_10_01
>
>Thanks in advance.

No worries.  Please let me know if this solves your problem.

Tom

>From address@hidden Wed Jun 12 19:41:51 2002
>Subject: Re: 20020610: McIDAS Grid Math Problem 

Tom,

Thanks for your help with the GRIDS creation problem.  I may see you next
week when I am in Boulder for a COMET lecture.

Arlene