[McIDAS #AIT-655217]: Ticket ID: FVC-112860

Hi Paul,

I am currently at home shoveling the 24+" of snow that has fallen overnight
and still coming down hard.  I will try to look into all that you include
below from time to time today.

Quick question:

- how many graphic and image levels are available in the McIDAS "session"
  (interactive or one created by a script by 'mcenv') when these images were
  were created?

  This can be listed using the UCU utility:

  UCU PEEK 500   <- graphics levels
  UCU PEEK 600   <- image (aka gray) levels

The reason I ask is that the display of an enhancement can look very strange
if there are a lot more enhancement levels defined than there are image
levels.  I don't think that this is causing your problems, but I want to
be sure.

Also, I don't understand this comment (at the end of your note):

> And then, the values are random on the
> side so they are not displaying the accurate number.

I don't see "random" numbers.  Can you explain what you mean?

re:
> If the non-use of a stretch table is best, why do the labels plot out as
> they do and I cannot find the zero isodop and highlight it?

If the mapping from original image value to velocity is fixed, then
finding/highlighting the zero isodop would be simple/straightforward.
Since the mapping of original image values to display levels varies
from image to image, this will be difficult (and I have not spent enough
time on the problem to be able to give you an ABC of what to do).

re:
> Also, why is
> there such a large color interval between 0 and -1 kts?

??? Where?  I guess I am missing something.

By the way, I sent a note to the MUG folks at SSEC requesting a
conference call to discuss the issue of dynamic mapping of 
image values and its effect on displays.  We will be "getting
together" as soon as they feel that they have reviewed the problem
enough to comment.  One possible approach is to have the server
map original image values to fixed data ranges, but I think that
this would result in loss of information.

Cheers,

Tom

> The output 
> I think every time I understand what is happening, I run some commands and
> get an entirely different result. So I am going to break this down in
> small pieces and see if I can capture the process.
> 
> http://climate.cod.edu/data/nexrad/TLX/N0S/TLX.N0S.20120203.1500.gif
> 
> Is an image I just generated. This was done with only an EU table that I
> created. I wanted the grey to be the zero isodop but it evidently maps to
> a varying scale based on the image that comes in.
> 
> When I use SU with the following table
> BREAKPOINTS STORED IN TABLE : NEWVEL.ST
> INPUT       OUTPUT
> -----       ------
> -70           1
> -70           15
> -69.9999      16
> -64           31
> -63.9999      32
> -50           47
> -49.9999      48
> -36           63
> -35.9999      64
> -26           79
> -25.9999      80
> -20           95
> -19.9999      96
> -10           111
> -9.9999       112
> -.0001        127
> 0             128
> 9.9999        143
> 10            144
> 19.9999       159
> 20            160
> 25.9999       175
> 26            176
> 35.9999       191
> 36            192
> 49.9999       207
> 50            208
> 63.9999       223
> 64            224
> 69.9999       239
> 70            240
> 70            255
> CALIBRATION TYPE  : NIDS
> CALIBRATION UNITS : VEL
> BAND NUMBER       : -1
> INTERPOLATION TYPE: LIN
> 
> I get the picture at
> http://climate.cod.edu/data/nexrad/TLX/N0S/TLX.N0S.20120203.1508.gif
> 
> Notice I lose the RF pallete so I clearly do not know where within the
> data file RF is assigned. Nor the TH data.So to have the color pallette I
> am choosing match those numbers which I do not know. Now when I use
> 
> Then I get this image
> http://climate.cod.edu/data/nexrad/TLX/N0S/TLX.N0S.20120203.1526.gif
> 
> when I use the SU table in IMGDISP command and BAR command
> mcidas@climate:~/paulsbatches$ su.k TABLE PAULVEL
> BREAKPOINTS STORED IN TABLE : PAULVEL.ST
> INPUT       OUTPUT
> -----       ------
> -90           0
> -90           14
> -89.9999      15
> 89.9999       239
> 90            240
> 90            255
> CALIBRATION TYPE  : NEXR
> CALIBRATION UNITS : VEL
> BAND NUMBER       : -1
> INTERPOLATION TYPE: LIN
> 
> mcidas@climate:~/paulsbatches$ eu.k TABLE NEWVEL
> Brightness  Blue      Green      Red
> min max   min max   min max   min max
> --- ---   --- ---   --- ---   --- ---
>   0  13     0   0     0   0     0   0
>  14  47   255 190   180  70     0   0
>  48 118    75   0   255  85     0   0
> 119 127    70 200   100 200    70 200
> 128 129   200 200   200 200   200 200
> 130 136   181  70   181  70   186 100
> 137 208     0   0     0   0    85 255
> 209 235   105   0   160 255   250 255
> 236 240     0   0   255 255   255 255
> 241 255   127 127     0   0   127 127
> eu.k: Done
> 
> So level 0-13 are supposed to be black. I just cant figure out WHY the
> colors show up the way they do. And then, the values are random on the
> side so they are not displaying the accurate number.
> 
> If the non-use of a stretch table is best, why do the labels plot out as
> they do and I cannot find the zero isodop and highlight it? Also, why is
> there such a large color inteval between 0 and -1 kts?
> 
> Thanks
> 
> Paul
> 
> 
> On Mon, 30 Jan 2012, Unidata McIDAS Support wrote:
> 
> > Hi Paul,
> >
> > re: I want the interval to be labelled at 10DBZ, not 8.
> >
> > I'll take a look at BAR to see if there is a straightforward way of
> > making the reflectivity levels be evenly divisible by 5 or 10.
> >
> > Cheers,
> >
> > Tom
> > --
> > ****************************************************************************
> > Unidata User Support                                    UCAR Unidata Program
> > (303) 497-8642                                                 P.O. Box 3000
> > address@hidden                                   Boulder, CO 80307
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> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: AIT-655217
> > Department: Support McIDAS
> > Priority: Normal
> > Status: Closed
> >
> 
> ******************************************************************************
> * Paul L. Sirvatka          | Office: (630) 942-2118 BIC3501                 *
> * Professor of Meteorology  | COD Weather Lab: (630) 942-2590                *
> * College of DuPage         | Address: 425 Fawell Blvd. Glen Ellyn, IL 60137 *
> ******************************************************************************
> 
> 

Cheers,

Tom
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Ticket Details
===================
Ticket ID: AIT-655217
Department: Support McIDAS
Priority: Normal
Status: Open