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[McIDAS #JGN-249914]: IMGMAKE



Hi Mike,

First, I want to correct a brain freeze in my last email!

I said:

> > I am using the GRB-delivered GOES-16 imagery for "production" as the GRB
> > Full Disk image resolutions are actually less (worse) than the sectors that
> > have been in the UNIWISC feed for many years.

I meant to say (but my fingers betrayed me by typing something different):

I am using the GRB-delivered GOES-16 imagery for "production" as the NOAAPort
Full Disk image resolutions are actually less (worse) than the sectors that
have been in the UNIWISC feed for many years.

The comparison is the GOES-East sectors from GVAR were 4 km resolution, and
the NOAAPort-delivered (SCMI) Full Disk sectors are 6 km resolution.  So,
IMGREMAPing a lower resolution image into a higher resolution output template
will result in feature smearing.  Sorry for the mis-infomation!!

re: GIS "layers"?

> I apologize, I'm using the wrong terminology.  No, I'm talking about
> McIDAS-X.  Example:  MAP FILE=OUTUSINT is what we typically use to plot
> interstates, including I-355.  Map files like these is what I was referring
> to.

OK.  I think that I am the one that added US Interstate maps to McIDAS (a LONG
time ago, hence the fogginess), so I guess that it is up to me to find a
current map database from which I can create a new McIDAS interstate
map file.

re:
> Got it.  This isn't a big concern, more of a passing curiosity we ask
> ourselves from time to time.

OK.

re:
> Okay, I'm sorry, but I have one other question for you.  Some of the RGB
> products we'd like to make have recipes which include a Gamma element to
> one or more of the RGB channels.  While I've figured out how to do
> differences and scaling using IMGOPER, could you tell me how I could apply
> a Gamma correction?  For reference, I'm using documents like this and
> others: http://www.eumetrain.org/RGBguide/recipes/recipes.pdf

As far as I know, McIDAS has no facility for applying a Gamma correction.

By the way, Fred Mosher wrote code to create pseudo-true color images in
McIDAS using a combination of Channels 1, 2 and 3 for Embry-Riddle Aeronautical
University (ERAU).  Here is a snippit from what he wrote in describing this to 
me:

"During the day, 3 visible channels
are combined into a true color image. The green channel is generated by a 
weighted
average ( .29 .29 and .33) for bands 1, 2 & 3. The red & green channels are 
brightness
normalized, and the blue channel also has a Rayleigh scattering correction in 
addition
to the brightness normalization."

The URL for the ERAU satellite web pages is:

http://wx.erau.edu/erau_sat/

There is some _very_ nice work shown in their site!

Cheers,

Tom
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Ticket Details
===================
Ticket ID: JGN-249914
Department: Support McIDAS
Priority: Normal
Status: Closed
===================
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