20030815: 20030815: IMBAR or other?

Stonie,

If you find my unofficial conventions useful, by all means 
push them as far as you can.

The projection model of GINI is pretty poor. For example, you can
only have 1 (La1) latitude for a LCC or STR projection (eg, it had to
be a tangent cone, and not a secant (where La1 != La2). When you get down
to higher resolution data, the numerical precision limits of the GINI
headercan lead to large errors. When I created the GINI for the 
radar mosaic, I picked the DX, DY such that the round off was minimized
since McIDAS has to compute a Pole point, and any error there is
gtreatly magnified.

Chiz


>From: "Stonie R. Cooper" <address@hidden>
>Organization: Planetary Data, Incorporated
>Keywords: 200308151947.h7FJlqLd026094

>Steve,
>
>That perfect!  Thanks!  Now for a more delicate question . . . could I role 
>your format into an ICD (giving you credit, of course) that we trying to push 
>onto NOAA to make better use of GINI?  We've been badgering them for a couple 
>years to expand the format and make an official publication . . . such as 
>support for more projections., expanding values (from 8bit to 16bit for 
>seamless GVAR representation), etc.
>
>Stonie
>
>On Friday 15 August 2003 16:22, Steve Chiswell wrote:
>> Stonie,
>>
>> To be more clear. I created my own calibrartion format for the GINI images
>> I created in nex2gini.
>>
>> If you were to preprocess your images and follow that format (my tables are
>> in $GEMTBL/unidata/nex2gini.tbl) for examples, then you would get units and
>> scales on the image bar. The format I used allows for multiple scale ranges
>> within the bar as is necessary for the precip scale in NIDS for example.
>> You could rip the code from nex2gini.
>>
>> Steve Chiswell
>>
>> On Fri, 15 Aug 2003, Stonie R. Cooper wrote:
> > Steve,
>> >
>> > Actually, GINI does have a calibration block . . . it's just never used. 
>> > If I preprocessed the GINI to have the necessary conversion, does GEMPAK
>> > understand the calibration block in GINI?
>> >
>> > Stonie
>> >
>> > On Friday 15 August 2003 16:05, Steve Chiswell wrote:
>> > > Stonie,
>> > >
>> > > The AREA files in the UNIWISC IDD feed have calibration information, so
>> > > the units and values are shown in the image bar. This includes the
>> > > sounder channel products which are also in the NOAAPORT sbroadcast as
>> > > GINI images.
>> > >
>> > > The GINI images in the NOAAPORT broadcast do not have a calibration
>> > > block, so unless you were to use an external table for the GINIs
>> > > (similar to what I did for the radar composites I create in GINI format
>> > > for the FNEXRAD feed) the programs do not have theinformation to plot
>> > > units/values other than the pixel values.
>> > >
>> > > Steve Chiswell
>> >
>> > --
>> > Stonie R. Cooper
>> > Planetary Data, Incorporated
>> > (402) 782-6611

>-- 
>Stonie R. Cooper
>Planetary Data, Incorporated
>(402) 782-6611
>