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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi Nacho.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">A bit of background first.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">At Geoscience Australia we have recently completed a new GNSS data repository (I will send an email announcing this shortly). Early
on in the development we hit the problem of UNIX compression not being supported by the modern systems/applications, we spent some time writing the code in Python to support the recompression but in the decided against using it. As such we made a decision
to transition all of our historic RINEX 2 data to gzip. We are still submitting files to IGS data centres using UNIX compression and making a copy of files available via old FTP (not via our new data repository, which is not going to support FTP). We do at
some point in the near future plan on only supporting and submitting RINEX 3 files.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">In answer to your questions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Geoscience Australia is supportive of the change and have no problem with the proposed date. We are in a position to submit
RINEX files to IGS DC’s in any compression format requested (our preference is for gzip).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">On a global data centre level I agree that changing the compression of historic files could cause problems. That said at
a local/regional level, as stated above we will (have) change(d) all of our historical files to use gzip compression. To continue supporting legacy applications/users we will retain a UNIX compressed copy of the files available only via FTP on our old data
centre. <o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I am not aware of any specific place, but there may be commercial software packages that will need changes made to them.
This could cause problems with legacy software where patching support is no longer provided.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Ryan<o:p></o:p></span></p>
<p class="MsoListParagraph" align="center" style="text-align:center"><a name="_jsAppendBmk_"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:navy;mso-fareast-language:EN-US">UNCLASSIFIED<o:p></o:p></span></a></p>
<p class="MsoListParagraph" align="center" style="text-align:center"><span style="mso-bookmark:_jsAppendBmk_"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:navy;mso-fareast-language:EN-US">Classified by ryan.ruddick@ga.gov.au on 10/01/2019
2:00:21 PM</span></span><span style="mso-bookmark:_jsAppendBmk_"></span><a name="_jsAppendBmkEnd_"></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><a name="_jsOm_AF84052153394541A3A0EFF781F4F669"></a><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">
IGS-IC <igs-ic-bounces@lists.igs.org> <b>On Behalf Of </b>Nacho Romero<br>
<b>Sent:</b> Tuesday, 8 January 2019 9:28 PM<br>
<b>To:</b> igs-dcwg@lists.igs.org; ic IGS List <igs-ic@lists.igs.org>; Lou Estey <lou@unavco.org>; David Maggert <dmaggert@unavco.org>; MacLeod, Ken <Ken.MacLeod@NRCan-RNCan.gc.ca><br>
<b>Cc:</b> gsfc-cddis-ops@lists.nasa.gov; Limbacher, Rebecca Irene. (GSFC-690.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] <rebecca.i.limbacher@nasa.gov>; mark.van.kints-esa.int <mark.van.kints@esa.int><br>
<b>Subject:</b> [IGS-IC-814] compression file changes ...<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Dear all,<o:p></o:p></p>
<p>At the last IGS workshop at the IC+DC splinter meeting we approved the recommendation ...
<o:p></o:p></p>
<p><b><span style="font-family:"Calibri",sans-serif">2018-4. </span></b><span style="font-family:"Calibri",sans-serif">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)</span><o:p></o:p></p>
<p><o:p> </o:p></p>
<p>Please provide us comments on the following;<o:p></o:p></p>
<p>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?
<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>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
<o:p></o:p></p>
<p>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?<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>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.<o:p></o:p></p>
<p>Please let us know your comments on this specific recommendation and I will collate all the discussion points for the coordination telecon. Thanks.<o:p></o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>Best regards,<o:p></o:p></pre>
<pre>Nacho<o:p></o:p></pre>
<pre>_______________________________________________________________<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Ignacio (Nacho) Romero<o:p></o:p></pre>
<pre>Aerospace Engineer, PhD<o:p></o:p></pre>
<pre>CSC Ltd @ ESA/ESOC/OPS-GN<o:p></o:p></pre>
<pre>Satellite Navigation Engineer @ ESOC Navigation Support Office<o:p></o:p></pre>
<pre>IGS Infrastructure Committee Chair<o:p></o:p></pre>
<pre><a href="http://www.navigation-office.esa.int">www.navigation-office.esa.int</a><o:p></o:p></pre>
<pre><a href="http://www.canaryspaceconsulting.co.uk">www.canaryspaceconsulting.co.uk</a><o:p></o:p></pre>
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