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20031202: GOES IR Calibration



------- Forwarded Message

From: Wahner Paul Contr CSR 4500 <address@hidden>
To: "'McIDAS Users List'" <address@hidden>
Subject: GOES IR Calibration
Date: Tue, 2 Dec 2003 18:22:17 -0000 

Hello MUGgers, 

Question for the satellite experts out there. The GOES User's Guide
(1983) makes reference to the "Standard IR Calibration Table" (Fig.
7-2). This table correlates count values to temperatures. Is the
information in this table valid for GOES-12? If not, is there another
table published somewhere that is? Thanks. 

Paul Wahner
MIDDS Systems Engineer/ Meteorologist
CSR 4500, Cape Canaveral Air Force Station
address@hidden
(Com) 321.853.8184 (Fax) 321.853.8291
(DSN) 467.8184

From: Dave Santek <address@hidden>
Date: Tue, 02 Dec 2003 12:57:27 -0600
To: address@hidden
Subject: Re: GOES IR Calibration

Paul,

I think the 1983 guide is for 8-bit counts....not the 10-bit counts for 
the current satellites.

But, when you display an image, the conversion from temperature to 
grayscale [8-bit] uses that standard IR table. This is the default in 
McIDAS for all IR sensors on all satellites.

dave

From: Erik Johnson <address@hidden>
To: address@hidden
Date: 02 Dec 2003 14:39:07 -0500

Paul-

Michael Weinreb, et. al. authored a document that outlines the
calculations for converting raw GVAR counts to radiance and temperature
values.  Look-up tables for correlating counts w/ physical values for
GOES 8-12 are also included towards the end of the document.

"Conversion of GVAR Infrared Data to Scene Radiance or Temperature"
http://www.oso.noaa.gov/goes/goes-calibration/gvar-conversion.htm

GOES 12 IR Imager lookup table:
http://www.oso.noaa.gov/goes/goes-calibration/docs/goes12_img_side1_lut

Hope this helps.

cheers,
Erik Johnson

CLASS developer
TMC Technologies


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