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20020212: 20020212: reading/writing McIdas area files for use in GEMPAK

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  • Subject: 20020212: 20020212: reading/writing McIdas area files for use in GEMPAK
  • Date: Tue, 12 Feb 2002 12:52:08 -0700
David,

My note means that if you have an AREA file in TANC projection,
GEMPAK will be able to plot it. MCIDAS calls a LAMBERT Tangent
projection TANC as a separate projection from LAMB. GEMPAK
will call these both LCC. The secant projection will have
different la1 and la2 values. The tangent projection will
have la1=la2. 

Sure you can center a TANC projection over Washington.

Steve Chiswell




>From: David Ovens <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200202121940.g1CJeYx23140

>Steve,
>
>Does this mean that TANC does what I want and I should just figure out
>how to use it?
>
>David
>
>Unidata Support wrote:
>> 
>> 
>> David,
>> 
>> I added the TANC projection to the imar2gm.f routine in the
>> patches area of the GEMPAK downloads. The McIDAS routine for 
>> TANC does hardcode the radius of earth, and not stored in the 
>> navblk.
>> 
>> I'll let Tom address creating AREA files.
>> 
>> Steve Chiswell
>> Unidata User Support
>> 
>> 
>> >From: David Ovens <address@hidden>
>> >Organization: UCAR/Unidata
>> >Keywords: 200202121913.g1CJDNx21764
>> 
>> >Hello,
>> >
>> >I am hoping to create a bogus McIdas area file -- basically a GOES-10
>> >image rotated up so Seattle is about at the center of the image -- so
>> >that I can get a different satellite projection in GEMPAK (if you want
>> >an example of what my output would look like, see 
>> > http://www.atmos.washington.edu/~ovens/loops/wxloop.cgi?joes_okc_h500+all
>> >).  Anyhow, I think that all I need to do is figure out how to read an
>> >existing McIdas file (GOES-10) and write it back out changing only the
>> >4th word in the navigation section from "102042" to "474500" or
>> >something like that.  Is there FORTRAN (preferably), C, or PERL code
>> >out there that could help me with this?
>> >
>> >By the way, I have looked at maknav and imgremap in McIdas-X and I
>> >understand the LAMB, MERC, PS, RADR, RECT, and MOLL projections, it's
>> >possible that SIN, TANC, or NOAA does what I want, but I don't
>> >understand those.  Basically, I didn't see how I could do a new
>> >satellite projection if I did not already have a file with the
>> >projection that I want to create.
>> >
>> Thanks for any help or suggestions.
>> >
>> >David
>> >-- 
>> >
>> >David Ovens         e-mail: address@hidden
>> >(206) 685-8108          plan: Real-time MM5 forecasting for Pacific Northwe
> st
>> >Research Meteorologist
>> >Dept of Atmospheric Sciences, Box 351640
>> >University of Washington 
>> >Seattle, WA  98195
>> >
>> 
>> ****************************************************************************
>> Unidata User Support                                    UCAR Unidata Program
>> (303)497-8644                                                  P.O. Box 3000
>> address@hidden                                   Boulder, CO 80307
>> ----------------------------------------------------------------------------
>> Unidata WWW Service                        http://www.unidata.ucar.edu/     
>> ****************************************************************************
>> 
>
>
>-- 
>
>David Ovens            e-mail: address@hidden
>(206) 685-8108          plan: Real-time MM5 forecasting for Pacific Northwest
>Research Meteorologist
>Dept of Atmospheric Sciences, Box 351640
>University of Washington 
>Seattle, WA  98195
>