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

[IDV #YMJ-686252]: radar level II

Hi Donna-

Just to follow up, the latest nightly release has a fix for
the .bz2 files so you no longer need to uncheck the Use CDM
button or rename your files.

Thanks for bringing this to our attention.

Don 
 
> > Thanks for your insights on this problem.  I have been
> > trying to load the files with the Use CDM box checked
> > and still get the error.  Do you have a suggestion for
> > the proper extention to use if I rename files?
> 
> It's not clear from what I wrote, but it should be un-check
> the "Use CDM" (i.e. no check mark) and then read them in.
> 
> As for an extension, you don't need any, but you might want
> to put the station ID (so you can distinguish them from others)
> or .level2 or something so they are more specific than with
> just the date.
> 
> We're looking at the code that does the decompression to
> figure out a better way to handle this also.
> 
> Don
> > Donna
> >
> > --- Unidata IDV Support
> > <address@hidden> wrote:
> >
> > > Hi Donna-
> > >
> > > Thanks for the file, that clears things up for me.
> > >
> > > > OK, the build date is Build Date: 2007-04-11 07:04
> > > > UTC.  I am not sure that is relevant, however, I
> > > just
> > > > sent a follow up message.  As it turns out, I
> > > still
> > > > have IDV 2.1 and 2.0 on my disk - sometimes being
> > > lazy
> > > > pays off.  The files load with IDV 2.0 but not
> > > with
> > > > IDV 2.1  Thus, I can use 2.0 in class tomorrow.  I
> > > > have attached one of the files.  I think they are
> > > all
> > > > downloaded from the IDD but I am not sure.  These
> > > are
> > > > radar files of the Lawrence microburst.  We did
> > > get a
> > > > fair amount of data before the power went out.  I
> > > > might have downloaded two or three times from
> > > NCDC, I
> > > > just don't remember.  I did try several individual
> > > > files as well as the whole group.  Thus, I do not
> > > > think the problem is with any individual file.
> > >
> > >
> > > Here's a synopsis of the problem.  First, the error
> > > you are
> > > getting is due to a problem in code repository.  You
> > > are
> > > picking up a bad version of the program that
> > > decompresses
> > > the data.  I've fixed that one.  But, since the
> > > files all end
> > > with .bz2, the IDV now thinks that they are bzipped
> > > and tries
> > > to uncompress them.  In reality, the files are
> > > bundles of
> > > compressed radials that were sent out in the IDD,
> > > not one big
> > > file that was BZIP2 compressed.
> > >
> > > In version 2.0, we were using a different file
> > > reader that
> > > couldn't handle compressed files.  Now, we are going
> > > through
> > > the netCDF for Java Common Data Model which does try
> > > to
> > > decompress the files first, depending on the suffix.
> > >  So, for
> > > .Z files, it tries to uncompress them, for .gz
> > > files, it tries
> > > to gunzip them, and for .bz2 files it tries to
> > > decompress
> > > them with the  BZIP2 algorithm.
> > >
> > > What does this all mean for you?  At present, if you
> > > want to
> > > read the files in, you'll need to rename them to get
> > > rid of the
> > > .bz2 extension.  Alternatively, you can check off
> > > the "Use CDM" box
> > > on the Level II chooser and it will read them in
> > > using the old
> > > style of reading.  However, sometimes the displays
> > > for that
> > > method are not correct, but at least they will be no
> > > worse than
> > > when you used them last time.
> > >
> > > In the long run, it would be wise to remove the .bz2
> > > extension from
> > > your files, but I understand that if you have a lot,
> > > that is a pain.
> > > But, it's like having a .doc extension on them and
> > > trying to open
> > > it in Windows.  Windows would guess that they would
> > > be Word files based
> > > on the file name extension.
> > >
> > > Don Murray
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: YMJ-686252
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Open
> > >
> > >
> >
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Tired of spam?  Yahoo! Mail has the best spam protection around
> > http://mail.yahoo.com
> >
> >
> 


Ticket Details
===================
Ticket ID: YMJ-686252
Department: Support IDV
Priority: Normal
Status: Closed