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Re: IDL code to read MSU and HIRS in Level1b [message #40570 is a reply to message #40569]

Wed, 18 August 2004 09:56

Yamout
Messages: 8
Registered: August 2004

Junior Member

David Fanning wrote:
> Yamout writes:
>
>
>> Is there any kind human being who can help an illiterate student to read
>> a few MSU and HIRS data of NOAA 1991. I have got them from
>> www.saa.noaa.gov and they have some differences with LAC and GAC.
>> I have ENVI with full version of IDL installed in PC with Windows NT.
>
>
> That's a pretty powerful weapon you have there. Are you
> *sure* nobody told you how to use it? :-(
>
> Cheers,
>
> David
Dear David,

thank you very much fro your reply. No, unfortunately I am sure that
nobody have told me how to use it. The format description is not the
most convenient one. I have got the following message from SAA after
many mail exchanges:
--------------------------
In response to your SAA Help Desk inquiry

E-Mail : Dear Hossein Yamout,

The only difference between the data from before and after January
1, 1995 is the record length. For data from prior to 1995, there were
additional spare bytes at the end of each data record, effectively
increasing the overall record length. In particular, for the line item
you referenced, L5409101, which was for MSU data, you will want to look
at section 4.3 of the POD Guide
http://www2.ncdc.noaa.gov/docs/podug/html/c4/sec4-3.htm

If you look at table 4.3.2.1-1. titled Format of MSU data, you will
see that pre-1995 data had spare bytes in byte locations 401 to 440
while the data starting in 1995 had spare bytes in byte locations 401 to
437. Otherwise, the formats are identical. If you are interested in the
other TOVS data types, they too had a record length change starting in
1995. The appropriate section of the POD Guide spells out the record
length change for these data types as well. For SSU data, see
http://www2.ncdc.noaa.gov/docs/podug/html/c4/sec4-2.htm
and for HIRS data see
http://www2.ncdc.noaa.gov/docs/podug/html/c4/sec4-1.htm

I hope this clarifies this matter for you.

Sincerely,
CLASS Help Desk
------------------------------------
Do like to probe the data, so that I send you a sample? It is 127282 byte.
Regards
Hossein
~~~~~~~

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[Message index]

		Re: IDL code to read MSU and HIRS in Level1b By: marcuirl on Thu, 19 August 2004 02:27
		Re: IDL code to read MSU and HIRS in Level1b By: Yamout on Thu, 19 August 2004 01:26
		Re: IDL code to read MSU and HIRS in Level1b By: Mark Hadfield on Wed, 18 August 2004 13:41
		Re: IDL code to read MSU and HIRS in Level1b By: Haje Korth on Wed, 18 August 2004 12:42
		Re: IDL code to read MSU and HIRS in Level1b By: David Fanning on Wed, 18 August 2004 10:16
		Re: IDL code to read MSU and HIRS in Level1b By: Yamout on Wed, 18 August 2004 10:13
		Re: IDL code to read MSU and HIRS in Level1b By: David Fanning on Wed, 18 August 2004 10:03
		Re: IDL code to read MSU and HIRS in Level1b By: Yamout on Wed, 18 August 2004 09:56
		Re: IDL code to read MSU and HIRS in Level1b By: David Fanning on Wed, 18 August 2004 09:42
		Re: IDL code to read MSU and HIRS in Level1b By: Mark Hadfield on Thu, 19 August 2004 14:34

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