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[IDV #ANI-315803]: calculation of perturbations using SAVS-like function (GEMPAK)

Hi Cory-

> I'm getting slower and slower with these responses...not good...maybe I just 
> need a beer.

No problem.  I haven't had time to look at this.  We start the IDV training 
workshop tomorrow so I've been getting ready for that.

 Anyway...the mean is across 1 time step (mean for one forecast output time 
i.e. 1 hour for me). As for the GEMPAK code...I use the function below
> 
> GFUNC    = sub(un(wnd),savs(un(wnd)))

What does savs give you over savg.  Are you subsetting by region or by level?

> This function I use in GDCROSS where I set my CXSTNS equal to my lat;long of 
> the endpoints. So as I read this, I am subtracting the mean u component 
> calculated on each pressure surface along the crossection I defined from each 
> u.

Okay, I understand what you are trying to do now.

 I check this with what I obtain in IDL and both agree. At this stage in my 
life, if I get just 2 things to agree I'm stoked (I totally ignore if both 
precedures are incorrect in the same way!!).
> 
> I have attached a figure which shows several crossectional averages for 
> different parameters (only need to focus on the black contour lines with show 
> u(prime). I would like to do this in IDV only show a 3D image of u' (and 
> other parameters) over the mountain. Essentially a 3D box over the mountain 
> to show which levels/sides are contributing more to convergence/divergence.
> 
> whew.....that's alot...anything else you need on your end?

That'll do it (except for the savs vs savg question above).

We'll put this request on the TODO list.  We've got a lot of other things on 
the list right now (like reading GEMPAK point/sounding files), but we might be 
able to sneak it in at some point.  The hard part will be to do an average at 
each level instead of over the entire volume, but that's just an index space 
thing.

Don

> ________________________________________
> From: Unidata IDV Support [address@hidden]
> Sent: Tuesday, July 28, 2009 8:34 AM
> To: Joshua C Demko
> Cc: address@hidden
> Subject: [IDV #ANI-315803]: calculation of perturbations using SAVS-like 
> function (GEMPAK)
> 
> Hi Cory-
> 
> > Full Name: Cory Demko
> > Email Address: address@hidden
> > Organization: UWYO
> > Package Version: 2.7b3 build date:2009-06-16 07:07 UTC
> > Operating System: Windows XP
> > Hardware: Java: home: C:\Program Files\IDV_2.7b3\jre version: 1.6.0_11 
> > j3d:1.5.2 fcs (build4)
> > Description of problem: Don:
> >
> > Sorry for the delay...decided to make a new support email...to answer your 
> > question, I am looking at calculating the mean u component along a constant 
> > pressure surface to determine u' along the same pressure...I will then make 
> > a cross section of u'...for each timestep...
> 
> And sorry for our delay.  There is no method to do this in the IDV currently, 
> but we are thinking about adding this capability.  So, I have a couple of 
> questions:
> 
> - is the mean across all timesteps, or for each timestep?
> - can you send me instructions on how you would do this in GEMPAK?
> 
> Don
> 
> 
> Ticket Details
> ===================
> Ticket ID: ANI-315803
> Department: Support IDV
> Priority: High
> Status: Open
> 


Ticket Details
===================
Ticket ID: ANI-315803
Department: Support IDV
Priority: High
Status: Open