<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><div class="">Dear Bruno,</div><div class=""><br class=""></div><div class="">Following the discussion about the past, current and future priorities, I have put together some notes on the multi-D priority area, and how it reached the milestone of the first set of standards to address the needs, and some of the feedback afterwards. </div><div class=""><br class=""></div><div class="">Some aspects of the process were very useful, and may serve as a good example on how to manage scientific priority areas. In particular the use of a set of “Minimal Requirements” that were approved by exec, then assessed by TCG in order to guide the work done in WGs. It did of course take much longer than originally hoped, but we really did get the standards we needed. </div><div class=""><br class=""></div><div class="">There is much more that could be discussed of course (are we really getting the implementations we need, are the tools and services using the standards? etc.) but I thought it would be useful at this point where we are reviewing the current and future priorities.</div><div class=""><br class=""></div><div class="">best regards,</div><div class="">Mark</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">A short review of the Multi-d IVOA priority area 2012-2017</div><div class=""><br class=""></div><div class="">Multi-dimensional Access minimal requirements (set in 2013):</div><div class=""><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="" style="margin: 0px; min-height: 14px;"><ol class="MailOutline"><li class="">Data Discovery (Query) – A user queries a data collection with one or more of the following constraints:</li><ul class=""><li class="">RA,Dec</li><li class="">Frequency/wavelength</li><li class="">Polarization states</li><li class="">Spatial size</li><li class="">Angular resolution</li><li class="">Integration time</li><li class="">Time of observation</li></ul><li class="">Data Access – Once a user has the list of observations that satisfy the constraints, they select all or a subset of the observations and:</li><ul class=""><li class="">Download the complete science data for each of the selected observations or;</li><li class="">Download simple cutouts of the science data for each of the selected observations</li></ul><li class="">Simple Cutout</li><ul class=""><li class="">Spatial: a circle (a coordinate and a radius)</li><li class="">Energy: one interval (from energy1 to energy2)</li><li class="">Time: one interval (from time1 to time2)</li><li class="">Polarization: a list</li></ul></ol></div></div><div class=""><br class=""></div></div><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="" style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; line-height: normal;"><div class="">Additional requirements for cut-outs that were considered desirable but out of scope</div><div class="">- Sum along any one or more axes<br class="">- Re-bin in one or more axes<br class="">- Multiply by a function<br class="">- Other action on the data</div><div class=""><br class=""></div></div></div></div></div><div class=""><br class=""></div><div class="">Timeline:</div><div class=""><br class=""></div><div class="">October 2012</div><span class="">"Time Domain Astronomy, and Multi-dimensional Data were AGREED as priority areas for IVOA.”<br class="">FM46S <a href="https://wiki.ivoa.net/internal/IVOA/IvoaRepMin/ivoa-fm46s-20121024.pdf" class="" moz-do-not-send="true">https://wiki.ivoa.net/internal/IVOA/IvoaRepMin/ivoa-fm46s-20121024.pdf</a><br class=""><br class="">May 2013<br class="">Focus session on multi-dimensional data at Heidelberg, Interop Meeting<br class=""><a href="https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2013" class="" moz-do-not-send="true">https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2013</a><br class=""><br class="">May 2014</span><div class=""><span class="">Focus session on multi-dimensional data at ESAC/Madrid Interop Meeting</span></div><div class=""><span class=""><a href="https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2014MultiD" class="" moz-do-not-send="true">https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2014MultiD</a></span></div><div class=""><span class=""><br class=""></span></div><div class="">June 2015 </div><div class="">DataLink 1.0 IVOA Recommendation</div><div class=""><br class=""></div><div class="">December 2015</div><div class="">SIA 2.0 IVOA Recommendation 23 December 2015</div><div class=""><br class=""></div><div class=""><span class="">May 2016</span></div><div class=""><span class="">Focus Sessions on “Interoperability of data from major astronomy projects"</span></div><div class=""><span class=""><a href="https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2016Focus" class="" moz-do-not-send="true">https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2016Focus</a></span></div><div class=""><span class=""><br class=""></span></div><div class=""><span class=""><br class=""></span>May 2017<span class=""><br class=""></span><div class=""><div class="">- SODA 1.0 IVOA Recommendation 17 May 2017</div><div class="">- Obscore 1.1 IVOA Recommendation 9 May 2017</div></div><div class="">- Announced the milestone - IVOA multi-d data standards: first set of standards to address Discovery, Access and Simple cut-out of multi-d data</div><div class=""><br class=""></div><div class="">July 2018</div><div class="">IVOA Note on Feedback on the DAL protocols relevant to Multi-d standards (F. Bonnarel)<span style="background-color: rgb(255, 255, 255);" class=""> </span><a class="moz-txt-link-freetext" href="http://www.ivoa.net/documents/Notes/RecentDALProtocolsFeedback/index.html" style="background-color: rgb(255, 255, 255);">http://www.ivoa.net/documents/Notes/RecentDALProtocolsFeedback/index.html</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Relevant standards:</div><div class=""><br class=""></div><div class="">- SODA 1.0 IVOA Recommendation 17 May 2017</div><div class="">- Obscore 1.1 IVOA Recommendation 9 May 2017</div><div class="">- SIA 2.0 IVOA Recommendation 23 December 2015</div><div class="">- DataLink 1.0 IVOA Recommendation 17 June 2015</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Relevant Implementations:</div><div class=""><br class=""></div><div class="">See : Review by F. Bonnarel at Feb 2019, ASTERICS DADI Technology Forum:</div><div class=""><br class=""></div><div class=""><a href="https://www.asterics2020.eu/dokuwiki/lib/exe/fetch.php?media=open:wp4:multi-d_status_at_the_end_of_asterics.pdf" class="" moz-do-not-send="true">https://www.asterics2020.eu/dokuwiki/lib/exe/fetch.php?media=open:wp4:multi-d_status_at_the_end_of_asterics.pdf</a></div><div class=""><br class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"></div></div></div></div></div><div class=""><br class=""></div><div class=""><br class=""></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Mark G. Allen</div><div class="">Director CDS</div>+33 (0)3 68 85 24 87</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">+33 (0)7 84 07 87 57<br class=""><a href="mailto:mark.allen@astro.unistra.fr" class="">mark.allen@astro.unistra.fr</a><br class=""><div class="">http://cdsweb.u-strasbg.fr/~allen</div></div></div></div>
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