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

[McIDAS #CTJ-586885]: Fwd: EFFRADVIS27APR20112025

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [McIDAS #CTJ-586885]: Fwd: EFFRADVIS27APR20112025
  • Date: Mon, 29 Oct 2012 22:37:24 -0600
Hi Rod,

re:
> Like what I am saying is the .ALT(Latitude)  and .ALN (Longitude)
> 
> .ALT read from top to bottom
> 
> First column first row------) some number A for instance
> 
> Now for .ALN reading from left to right
> 
> Fist column first row----) some number B for instance
> 
> so coordinates would be (A,B)  for the 1st row or column bright count value?

Correct.

re:
> First column second row------) some number C for instance
> 
> Now for .ALN reading from left to right
> 
> Fist column second row----) some number D for instance
> 
> so coordinates would be (C,D) for the 2nd row or column bright count value?

Correct.

re:
> And so on if that makes sense?

Draw a grid of dots and assign location values to the lattice points:

             col 1            col 2             col 3           ...
row  1   37.14N,95.07W    37.14N,95.02W      37.14N,94.96W      ...
row  2   37.09N,95.07W    37.09N,95.02W      37.09N,94.96W      ...
row  3   37.05N,95.07W    37.05N,95.02W      37.05N,94.96W      ...
 .
 .
 .
row last 22.27N,95.07W    22.27N,95.02W      22.27N,94.96W      ...

NB: these locations are invariant for all of your study days
because the IMGREMAP projection and size used in EFFRAD3.BAT is fixed.

Draw a second grid and assign brightness values to the lattice points
(these values are from 2720111955):

             col 1            col 2             col 3           ...
row  1         9                8                 7             ...
row  2        14               14                15             ...
row  3        15               10                15             ...
 .
 .
 .
row last       0                0                 0             ...

This is a tabular depiction of:

brit(37.14N,95.07W) =   9
brit(37.14N,95.02W) =   8
brit(37.14N,94.96W) =   7
 ...
brit(37.09N,95.07W) =  14
brit(37.09N,95.02W) =  14
brit(37.09N,94.96W) =  15
 ...
brit(37.05N,95.07W) =  15
brit(37.05N,95.02W) =  10
brit(37.05N,94.96W) =  15
 ...
brit(22.27N,95.07W) =   0
brit(22.27N,95.02W) =   0
brit(22.27N,94.96W) =   0


How this needs to be formulated for use in GrADS is not something
I can comment on since I am not a GrADS user.  It should be
straightforward, however.

Cheers,

Tom
--
****************************************************************************
Unidata User Support                                    UCAR Unidata Program
(303) 497-8642                                                 P.O. Box 3000
address@hidden                                   Boulder, CO 80307
----------------------------------------------------------------------------
Unidata HomePage                       http://www.unidata.ucar.edu
****************************************************************************


Ticket Details
===================
Ticket ID: CTJ-586885
Department: Support McIDAS
Priority: Normal
Status: Closed