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20030826: BOUNCE address@hidden: Non-member submission from ["Gary S. Wade" <address@hidden>]



>From: address@hidden
>Organization: UCAR/Unidata
>Keywords: 200308262050.h7QKogu2015064 NOAAPORT Unidata-Wisconsin McIDAS CIMSS

Hi Gary,

The email response you tried to send to Jim Koermer and the ldm-users email
list today bounced since the address you sent the email from:

address@hidden

is not subscribed to the list, and we limit submissions to all
lists we maintain to subscribed members.

Since your reply to Jim was so useful, I want to encourage you to
subscribe to the ldm-users email list and resubmit your note. If you
would rather not subscribe to the list, I can forward the message along
for you.  Please let me know which avenue you would like to pursue.

For reference:

Jim was mistaken in thinking that the various CIMSS products were only
now available in the NOAAPORT datastreams.  They have been three right
along, and we have been sending similar products in the
Unidata-Wisconsin datastream of the IDD.

Also, I include enhancements and stretch tables for all of the CIMSS
products (based on the ones that you make available) in my distribution
of McIDAS.  I was going to write to Jim to point out that he already
has all that he needs, but I have not had the time to do so today.

Cheers,

Tom Yoksas

>From address@hidden Tue Aug 26 14:50:40 2003
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>Date: Tue, 26 Aug 2003 15:50:31 -0500
>From: "Gary S. Wade" <address@hidden>
>Reply-To: address@hidden
>Organization: NOAA/NESDIS/ORA/ARAD/ASPT at UW-CIMSS
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>To: Jim Koermer <address@hidden>, Unidata McIDAS-X group
> <address@hidden>
>CC: Dave Santek <address@hidden>,  Matt Lazzara
> <address@hidden>,
>   Tim Schmit <address@hidden>, Jeff
> Key <address@hidden>
>Subject: GOES Sndr product imagery - color enhancements
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>
>Greetings Professor Koermer and other interested Unidata users,
>
>       In response to your inquiry about displaying and understanding GOES 
>Sounder DPI (Derived Product Images), I'll start with a brief overview 
>of the DPI concept and then provide a few sources for more detail and 
>examples.  First, the DPI are really just a presentation of the GOES 
>Sounder derived atmospheric profiles (or their derivatives, such as 
>total precipitable water (TPW) or lifted index (LI) stability) in clear 
>air in an image format, blended with traditional 11 um window band 
>imagery where clouds exist.  The profiles (or TPW or etc.) could also be 
>plotted or contoured for viewing; however, the DPI lend themselves well 
>to animation and provide a complete scene, with both retrieved GOES 
>product as well as cloud depiction (thus, permitting the display of 
>moisture evolution as well as convective development, for example). 
>Within McIDAS, a DPI "area" is typically just separated with values 
>0-200 for the product and 201-255 for the "cloud".  This breakdown holds 
>true for the "profile" DPI, including TPW, LI, CAPE, skin temperature, 
>etc.  A different separation is used for the complementary "cloud" DPI, 
>which includes cloud top pressure (CTP) and effective cloud amount 
>(ECA); values 0-75 are for clear (window) temperatures, while values 
>76-255 are for the cloud product.
>
>       Hourly examples of many of these GOES Sounder DPI are available for 
>viewing in near-realtime on the CIMSS Realtime GOES Page (at 
>http://cimss.ssec.wisc.edu/goes/realtime/realtime.html).  I do not think 
>that there is any one magical enhancement table (ET) that displays the 
>essence and content of a DPI.  Many factors come into play, not the 
>least of which is consideration for its aesthetic appeal.  Nonetheless, 
>at CIMSS, we have used some ETs, or very close cousins, consistently for 
>many years (even back in the mid 80's).  These basically continue to be 
>shown on the CIMSS page as well as the NESDIS/FPDT pages in Washington 
>(http://orbit-net.nesdis.noaa.gov/goes/sdpi/).  However, others have 
>chosen to use different palettes.
>
>       Some past discussion on selecting effective ETs for the DPI may be 
>found at http://cimss.ssec.wisc.edu/goes/dpiet/dpiet.html.  I'll just 
>mention here two general points of interest, to me, on color 
>enhancements.  First, I find distinct color bands to be useful in 
>allowing me to quickly associate a semi-quanitative value to the DPI 
>(for example, I know that "red" is modestly high moisture in the TPW - 
>light red 40mm+, darker red 45mm+ with finer intensity still available; 
>yellow is definitely less (30-39mm)).  Secondly, being one of those ~10% 
>of the population who suffer from color perception difficulties ("color 
>blindness"), I need to emphasize intensities, rather than hues, and 
>limit the number of colors (as only so many remain "independent").  Just 
>imagine that bright yellow and bright green look the same, or cyan and 
>white, or purple or blue, and so forth.  (I'm glad that I don't need to 
>use the radar ETs that often are used with NWS radar displays - it does 
>not work for me, with plenty of repeating colors.)  Anyway, effectively 
>coloring images is not necessarily a simple process.
>
>       Finally, for the nuts and bolts of the ETs that we show on the web 
>(whose displays are created on McIDAS), check the available files at 
>
>http://cimss.ssec.wisc.edu/seegsw/dpiets/readme.  Especially note the 
>simple batch files that can be run to build (EU) the ETs (such as 
>MAKPW1.BAT to make "GDPW1.ET").  The command PRDUTIL (via APPW.MCB, for 
>example) will enable appropriate use of the "D" key in McIDAS to 
>interrogate a pixel in a DPI area.  The BAR command is an alternate to 
>using virtual graphic scales to label the gray scale bar at the bottom 
>(but, I'm not sure if the units will be as desired).
>
>       So, enough of an introduction for now.  Please make comments, ask 
>questions, and/or provide suggestions.  Thanks much.
>
>
>                                       Gary
>
>
>-------- Original Message --------
>Subject: Color Palette/Values for Derived GINI Products
>Date: Mon, 25 Aug 2003 21:12:46 -0400
>From: Jim Koermer <address@hidden>
>Organization: UCAR/Unidata
>To: address@hidden, address@hidden
>
>
>Hello,
>
>Now that GINI lifted index, precip. water, skin temperature, and cloud
>top pressure pressure are coming over the GOES NOAAPORT channel, I was
>trying to come up with a color schemes that I could use with either WXP
>or McIDAS displays of these data and also trying to understand the
>units/ranges of these data.
>
>We have started looking at the imagery and tweaking various color values
>and they look somewhat similar to regular imagery (i.e. 0 to 255), but
>tend to be clustered in different regions within this range. However, I
>don't have any concept of how these values relate to the normal
>non-satellite derived values that I normally follow.
>
>Right now, I have a student trying different color combinations to find
>some that more clearly define the values and gradients. However, the
>question is how to interpret the resulting quantities. Has any one
>looked into these products.
>
>Jim
>-- 
>James P. Koermer               E-Mail: address@hidden
>Professor of Meteorology       Office Phone: (603)535-2574
>Meteorology Program            Office Fax: (603)535-2723
>Plymouth State University       WWW: http://vortex.plymouth.edu/
>Plymouth, NH 03264
>
>
>
>   * --- -- -      * --- -- -      * --- -- -      * --- -- -
>
>            Gary S. Wade         (... watch the sky ...)
>       NOAA/NESDIS/ORA/ARAD/Advanced Satellite Products Team
>   (1225 W. Dayton St.  Madison, WI 53706  Rm 435  608-263-4743)
>   (e-mail:  address@hidden  or  address@hidden)
>         [ http://cimss.ssec.wisc.edu/aspt/aspthome.html ]
>    [ http://cimss.ssec.wisc.edu/goes/realtime/realtime.html ]
>
>   - -- --- *      - -- --- *      - -- --- *      - -- --- *
>
>