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20040511: GRDCOPY in NcIDAS-X 2003



>From: Eirh-Yu Hsie <address@hidden>
>Organization: Aeronomy Laboratory/NOAA
>Keywords: 200405111727.i4BHRQtK005371 McIDAS GRDCOPY

Hsie,

>I have a question regarding to GRDCOPY command in McIDAS-X v2003.  The 
>system is a Sun Sparc running Solaris 5.8.  The following command only 
>give me one match:
>
>% grdcopy.k RTGRIDS/ETA MYDATA/GRIDS.132 DAY=2004132 TIME=12 GPRO=LAMB 
>NUM=ALL FHOUR=0 12 24 36 48 LEV=1000 850 700 500 250 PARAM=Z T U V
>
>% grdinfo.k MYDATA/GRIDS.132 LIST X GRI=1 LAST
>Listing data from  48-hour forecast V    Grid at 250 MB   from ETA
>Grid is at 120000 UTC on 2004132 from dataset: MYDATA/GRIDS
>     Row    Col    Latitude    Longitude    Value         Units  Level 
>Param
>      1       1      54.838     153.092   0.2042000E+02    MPS  250  MB   V
>GRDINFO Done, Number of grids listed=1

OK.

>It seems to me that it only give me the last match (V at 250 mb and 
>48-hr forecast).  Is this the corect behavior?

No, all grids matching the selection criteria should be copied.  What
I believe is happening is that GRID0132 was created to allow only
one grid.  If you rerun your commands after first creating an
output GRID file that can contain a lot of grids, it will succeed:

igu.k DEL 132
igu.k MAKE 132 1000
grdcopy.k RTGRIDS/ETA MYDATA/GRIDS.132 DAY=2004132 TIME=12 GPRO=LAMB NUM=ALL 
FHOUR=0 12 24 36 48 LEV=1000 850 700 500 250 PARAM=Z T U V
grdinfo.k MYDATA/GRIDS.132 LIST X GRI=1 LAST

A different way to list the grids in a GRID file is by using GRDLIST:

grdlist.k MDATA/GRIDS.132 NUM=ALL

Cheers,

Tom
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