[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

20011015: ploting realtime grids



>From: Owen Cooper <address@hidden>
>Organization: NOAA Aeronomy Laboratory, R/AL4
>Keywords: 200110152028.f9FKS0123855 McIDAS GRDDISP

Owen,

>Okay, how do I get around this one?
>
>I have a batch that plots AVN realtime grids every six hours, fired off by
>a cron job.
>The AVN data have several projections:
>a full northern hemisphere polar stereographic
>2 polar stereographic versions of N. AMerica
>1 Mercator of the the entire planet
>
>If I use the command:
>GRDDISP RTGRIDS/AVN DAY=#Y TIME=0 PARAM=P LEV=MSL FHOUR=0
>
>It will grab the first GRID that fits this decription and plot it up.

Right.

>This is usually the northern hemi. polar-stereographic, the one that I
>want.

This is not, however, guaranteed.

>But often the first grid that fits this description is one of the
>North American plots, which does me no good as I want to see what's going
>on over Europe.  Is there any way to tell MCIDAS which specific projection
>I want?

Yes.  Use the GPRO= keyword for GRDDISP.  For instance, the following
will always get you the LAMBert Conformal grid:

GRDDISP RTGRIDS/AVN DAY=#Y TIME=0 PARAM=P LEV=MSL FHOUR=0 GPRO=LAMB

>It doesn't look like specifying the grid number will do any good
>seeing as the grid numbers change in addition to the order in which the
>projections are available.

Right.  In order to use the grid number, you would have to do a
GRDLIST to find out the grid numbers first (ugly).  Using the GPRO=
keyword will get you around this, but it wouldn't get you around the
case where you have more than one Lambert Conformal grid of P at MSL
for the same DAY and TIME you are interested in.  For that case, you
would have to do a list and then use the grid number.

>Any suggestions?

Let me know if you run into amy problems using GPRO=.

>Thanks
>Owen
>
>Owen Cooper
>National Research Council Associate
>NOAA Aeronomy Laboratory, R/AL4
>325 Broadway
>Boulder CO 80305
>ph: (303) 497-3599
>fax: (303) 497-5686

Tom


NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.