[Smwg] Action 2017-1106-01 - Delta-DOR Metadata.

[Barkley, Erik J (3970)]

Colin,

I think there might be a little more follow-up required. The sample that was sent indicates compliance with a red book ("...OPEN-LOOP Observation File - Format compliant with CCSDS 506.1-R-1...).

There is a blue book for this (CCSDS 506.1-B-1).  Section 4.2 defines the observation header details. I don't think it quite matches what was sent (for example, there is no "V" or version line which the blue book calls out).  Note that the observation header is quite short (which is also the case in the blue book).   The majority of the file is then taken up with scan records, which I think is then the domain of DDOR proper. And not necessarily something that would concern TGFT per se.

In general though this brings up a question of how much of this metadata would be brought "outside" of the file to be transferred by TGFT. My initial thinking is that given that the DDOR WG has already defined a fair amount of metadata that is apparently used quite successfully that we really don't need much for TGFT. This is based on the assumption that the job for TGFT is simply to move the files from point A to point B and provide some very basic metadata as to what the file is about that can then be used for subsequent decisions as to what to do with the file. Under that assumption, it seems to me that the basic metadata re TGFT would be:


1)      DOR file type -- either a raw observation file for correlation or the correlated product/result (which is a very small file)

2)     The source of the file (Correlator Id or Observer Id in the case of the DDOR "raw" file)

3)     The spacecraft identifier for which the file is applicable


I think that would do it but of course we should check with the DDOR WG further. I also think that this does a good job of steering clear of work that has already been done.

Best regards,
-Erik


From: SMWG [mailto:smwg-bounces at mailman.ccsds.org] On Behalf Of Colin.Haddow at esa.int
Sent: Monday, January 22, 2018 7:35 AM
To: CCSDS SMWG ML (smwg at mailman.ccsds.org) <smwg at mailman.ccsds.org>
Subject: [Smwg] Action 2017-1106-01 - Delta-DOR Metadata.

Dear all,
                  please find attached an example of delta-dor metedata that Mattia supplied to me. With respect to the size of delta-dor files I understand from Mattia that "It depends on the length of the recording, the sampling rate and the quantisation. For Delta-DOR they can go from a minimum of about 25MB to a maximum of about 2GB, depending on the configuration"

Cheers for now,

Colin


---------------------------------------------------------------------------------------------------------
Dr. Colin R. Haddow,
HSO-GI, European Space Agency,
European Space Operations Centre,
Robert-Bosch-Str 5,
64293 Darmstadt,
Germany.

Phone; +49 6151 90 2896
Fax;      +49 6151 90 3010
E-Mail;  colin.haddow at esa.int<mailto:colin.haddow at esa.int>
---------------------------------------------------------------------------------------------------------

----- Forwarded by Colin Haddow/esoc/ESA on 22/01/2018 16:30 -----

From:        Mattia Mercolino/esoc/ESA
To:        Colin Haddow/esoc/ESA at ESA
Date:        22/01/2018 15:39
Subject:        Re: Delta-DOR Metadata.
________________________________


Hi Colin,

Please find attached a metadata file associated to the DDOR session
(it is a ASCII file)

Regards,

Mattia





From:        Colin Haddow/esoc/ESA
To:        Mattia Mercolino/esoc/ESA at ESA
Date:        19/01/2018 14:06
Subject:        Delta-DOR Metadata.
________________________________


Hi Mattia,
                    would it be possible for you to send me an example of the metadata that is associated with a delta-dor file ?. Could you also let me know what sort of size a typical delta-dor data file is ?

Thanks.

Cheers for now,

Colin


---------------------------------------------------------------------------------------------------------
Dr. Colin R. Haddow,
HSO-GI, European Space Agency,
European Space Operations Centre,
Robert-Bosch-Str 5,
64293 Darmstadt,
Germany.

Phone; +49 6151 90 2896
Fax;      +49 6151 90 3010
E-Mail;  colin.haddow at esa.int<mailto:colin.haddow at esa.int>
---------------------------------------------------------------------------------------------------------



This message and any attachments are intended for the use of the addressee or addressees only.

The unauthorised disclosure, use, dissemination or copying (either in whole or in part) of its

content is not permitted.

If you received this message in error, please notify the sender and delete it from your system.

Emails can be altered and their integrity cannot be guaranteed by the sender.



Please consider the environment before printing this email.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ccsds.org/pipermail/smwg/attachments/20180122/1829fe95/attachment.html>