[IGS-DCWG-193] Re: [IGS-IC-814] compression file changes ...

[Donahue, Brian (NRCan/RNCan)]

Hi Nacho,

Here are some thoughts from NRCan’s perspective.

1)      I missed the discussion at the workshop so does this mean starting June 1st any files submitted need to be gzip format or does it mean that any files containing data or products from June 1st onwards need to be in gzip format?  Either way we are in agreement with the date although if it means the latter for the switch of products it may make sense to pick the start of a GPS week (June 2nd?).  We think that the data providers should make an effort to transition but for any files that continue to come in as UNIX compressed the DCs should convert them to gzip before posting.

2)      We think that the historical files should also be converted to gzip by the DCs.  We would do this for our historic archive but maybe not right away.

3)      Nothing that we are aware of.

I think there will be a lot of work on our side (both as data/product providers and users) so it’s probably important that a date is picked and communicated asap.

Regards,
Brian



From: IGS-IC <igs-ic-bounces at lists.igs.org> On Behalf Of Nacho Romero
Sent: January 8, 2019 5:28 AM
To: igs-dcwg at lists.igs.org; ic IGS List <igs-ic at lists.igs.org>; Lou Estey <lou at unavco.org>; David Maggert <dmaggert at unavco.org>; MacLeod, Ken (NRCan/RNCan) <ken.macleod at canada.ca>
Cc: gsfc-cddis-ops at lists.nasa.gov; Limbacher, Rebecca Irene. (GSFC-690.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] <rebecca.i.limbacher at nasa.gov>; mark.van.kints-esa.int <mark.van.kints at esa.int>
Subject: [IGS-IC-814] compression file changes ...


Dear all,

At the last IGS workshop at the IC+DC splinter meeting we approved the recommendation ...

2018-4. To coordinate DC, IC and NC so as to move away from Z compression for all IGS files (data and products) and into using gzip (.gz)



Please provide us comments on the following;

1) I propose that we announce this change now with the date 01 June 2019 , and at that point we publish all the newly submitted files (data and products) as .gz in all IGS DCs, whether the owner submits it that way or not ... do you agree that DCs should enforce such a change or should we insist all the owners transition their own submitted files?



2) Do we change all the historical files to .gz ? This will generate "new files" which the myriad of sync processes (private and public) running between all sort of servers will cause a lot of duplications ... I propose we leave the old files as they are for now to avoid a lot of potential duplication of files in IGS and user's servers

3) are you aware of specific places were the .Z compression is requested? required? recommended? ... I think the site guidelines are generic enough, what do you think?



We have some other recommendations to discuss with you in the next few days, and in the next months I will organize a telecon so we can all agree a way forward for each one.

Please let us know your comments on this specific recommendation and I will collate all the discussion points for the coordination telecon. Thanks.

--

Best regards,

Nacho

_______________________________________________________________



Ignacio (Nacho) Romero

Aerospace Engineer, PhD

CSC Ltd @ ESA/ESOC/OPS-GN

Satellite Navigation Engineer @ ESOC Navigation Support Office

IGS Infrastructure Committee Chair

www.navigation-office.esa.int<http://www.navigation-office.esa.int>

www.canaryspaceconsulting.co.uk<http://www.canaryspaceconsulting.co.uk>

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