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[IDV #WWB-790357]: simple difference on objective analyses



Hi Brian-

> I downloaded this morning's build, but got the same result. I tried both
> the simple difference option and sub(a,b), but everything gives me the
> same plot.

Hmm, I just ran with the nightly build and it worked.  I've attached a bundle 
with the result.  Are you sure you got the nightly and not the regular build?  
Could you check the Help->About dialog to see the version and build date?

> On a side note, is the gain in the objective analysis going away for
> good? I liked being able to match the observations more exactly. On the
> other hand, I love the new smoothing option on color-shaded plots.

It's just that the panel doesn't expand to show it.  If you make the Field 
Selector
taller, it should appear.  The smoothing option has always been there on color 
shaded plan views, but maybe you were using the Image Display instead which 
doesn't have that.
In either case, I'm glad we got something right for you. ;-)

Don

> -----Original Message-----
> From: Unidata IDV Support [mailto:address@hidden]
> Sent: Thursday, December 03, 2009 2:58 PM
> To: Billings, Dr. Brian, Contractor, Code 7533
> Cc: address@hidden; Billings, Dr. Brian, Contractor, Code
> 7533
> Subject: [IDV #WWB-790357]: simple difference on objective analyses
> 
> Hi Brian-
> 
> The tomorrow morning's build will have a fix for this.   Now, you can
> subtract in either order.  You can pick up the nightly build from:
> 
> http://www.unidata.ucar.edu/downloads/idv/nightly
> 
> This is 2.8 alpha 1.  We are planning a 2.8beta1 release next week if
> you want to wait.
> 
> One more thing off my plate. ;-)
> 
> Don
> 
> > > Thanks for identifying the problem. I tried flipping the order of
> > > the lat/lon columns in the csv file for the obs, but that didn't
> > > change things in the display.
> >
> > No, it's the resulting grid that has the order at lon/lat and the
> vis5d grid uses lat/lon.  I've needed to work on this for a while, so
> this is a good reason to go down that scary path.  What it will mean is
> that instead of doing a-b, you'll need to use sub(a,b).  I'll probably
> change the simpleDifference to use that as well.
> >
> > Don
> >
> > > -----Original Message-----
> > > From: Unidata IDV Support [mailto:address@hidden]
> > > Sent: Thursday, December 03, 2009 6:01 AM
> > > To: Billings, Dr. Brian, Contractor, Code 7533
> > > Cc: address@hidden; Billings, Dr. Brian, Contractor,
> > > Code
> > > 7533
> > > Subject: [IDV #WWB-790357]: simple difference on objective analyses
> > >
> > > Hi Brian-
> > >
> > > > Actually, I've noticed the same thing, but gridded-v5d isn't
> > > > producing
> > >
> > > > a difference. It's just displaying the objective analysis of the
> > > > gridded field; the same as you would get by just plotting the
> > > > gridded
> > > data.
> > >
> > > Thanks for pointing that out.  The problem is that one grid is in
> > > lon,lat order and the other is lat,lon.  I'm working on a solution
> > > for this.
> > >
> > > Don Murray
> > >
> > > > -----Original Message-----
> > > > From: Unidata IDV Support [mailto:address@hidden]
> > > > Sent: Wednesday, December 02, 2009 9:21 AM
> > > > To: Billings, Dr. Brian, Contractor, Code 7533
> > > > Cc: address@hidden; Billings, Dr. Brian, Contractor,
> 
> > > > Code
> > > > 7533
> > > > Subject: [IDV #WWB-790357]: simple difference on objective
> > > > analyses
> > > >
> > > > Hi Brian-
> > > >
> > > > > I've uploaded a zipped IDV bundle called simpledifference.zidv.
> > > > > The comparison is between two precipitation fields. In this
> > > > > file, the fields are unitless, but I have tried specifying mm in
> 
> > > > > the text file
> > >
> > > > > header and using newUnit on the vis5d file and get the same
> result.
> > > >
> > > > Thanks for the files.  You definitely need to do the newUnit on
> > > > the Vis5D data. I can get it to work if I subtract the v5d from
> > > > the gridded point obs, but not the other way around.  I'll look
> > > > into that further when I get into the office.
> > > >
> > > > Don
> > > > > -----Original Message-----
> > > > > From: Unidata IDV Support [mailto:address@hidden]
> > > > > Sent: Wednesday, December 02, 2009 3:52 AM
> > > > > To: Billings, Dr. Brian, Contractor, Code 7533
> > > > > Cc: address@hidden
> > > > > Subject: [IDV #WWB-790357]: simple difference on objective
> > > > > analyses
> > > > >
> > > > > Hi Brian-
> > > > >
> > > > > > Full Name: Brian Billings
> > > > > > Email Address: address@hidden
> > > > > > Organization: Naval Research Laboratory Package Version: 2.7u2
> 
> > > > > > Operating System: Windows Vista
> > > > > > Hardware:
> > > > > > Description of problem: Have any issues been reported on using
> 
> > > > > > the
> > > > > simple difference formula where one of the fields is an
> > > > > objective analysis of point data? I have been trying to use this
> 
> > > > > option on a 2D vis5d file and a text data listing. The times are
> 
> > > > > the same and the units are the same, but the results are
> > > > > obviously incorrect. The
> > >
> > > > > users
> > > >
> > > > > guide says that the calculation is automatically performed only
> > > > > on the
> > > >
> > > > > area in which the grids overlap, but this is not being done in
> > > > > my output. Is the issue with using an objective analysis or some
> 
> > > > > other
> > > > possibility?
> > > > > Thanks.
> > > > >
> > > > > If you are subtracting temperatures, the values will end up in K
> 
> > > > > so if
> > > >
> > > > > you convert to Celsius you'll be off by a factor of 273.  The
> > > > > IDV does
> > > >
> > > > > not distinguish between delta degrees K and regular K so a
> > > > > conversion between units will treat them as absolute.
> > > > >
> > > > > If that's not what you are seeing, could you upload the vis5d
> > > > > file and
> > > >
> > > > > the text data to:
> > > > >
> > > > > http://motherlode.ucar.edu/repository/alias/idvupload
> > > > >
> > > > > so I can take a look.  Let me know what field you are trying
> > > > > this
> > > > with.
> > > > >
> > > > > Don Murray
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > Ticket Details
> > > > > ===================
> > > > > Ticket ID: WWB-790357
> > > > > Department: Support IDV
> > > > > Priority: Normal
> > > > > Status: Open
> > > > >
> > > > >
> > > >
> > > >
> > > > Ticket Details
> > > > ===================
> > > > Ticket ID: WWB-790357
> > > > Department: Support IDV
> > > > Priority: Normal
> > > > Status: Open
> > > >
> > > >
> > >
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: WWB-790357
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Open
> > >
> > >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: WWB-790357
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
> 


Ticket Details
===================
Ticket ID: WWB-790357
Department: Support IDV
Priority: Normal
Status: Open

Attachment: precip.zidv
Description: Binary data