https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/PIPE2D-385 DRP 2-D Pipeline <p>Following <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-344" title="Implement arm merging" class="issue-link" data-issue-key="PIPE2D-344"><del>PIPE2D-344</del></a>: improve the implemented merging algorithm, based on the old <tt>makePfsObject</tt> code. </p> <p><a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=price" class="user-hover" rel="price">price</a> to discuss this with <a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=rhl" class="user-hover" rel="rhl">rhl</a>.</p> PIPE2D-385

Improve arm merging algorithm

Task Normal Done Done price hassan Thu, 7 Mar 2019 15:11:36 +0000 Fri, 27 Sep 2019 18:13:21 +0000 Wed, 11 Sep 2019 19:46:16 +0000 0 2 <p>The merging algorithm itself is a weighted sum, and I've implemented that. However, I don't understand what the <tt>FluxTbl</tt> is for; I'd appreciate it if <a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=rhl" class="user-hover" rel="rhl">rhl</a> could explain that.</p> <p>Quoting @rhl in a slack chat (#drp-2d) on 2019-03-11:</p> <blockquote><p>In <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-385" title="Improve arm merging algorithm" class="issue-link" data-issue-key="PIPE2D-385"><del>PIPE2D-385</del></a> @paulprice wrote: "The merging algorithm itself is a weighted sum, and I've implemented that. However, I don't understand what the FluxTbl is for; I'd appreciate it if rhl could explain that."</p></blockquote> <blockquote><p>It's in the datamodel, and there's a slightly hard-to-spot explanation (hint: HDU #2 == FLUXTBL) : "The wavelengths are specified via the WCS cards in the header (e.g. CRPIX1, CRVAL1) for HDU #1, and explicitly in the table for HDU #2. We chose these two representations for the data due to the difficulty in resampling marginally sampled data onto a regular grid, while recognising the convenience of such a grid when rebinning, performing PCAs, or stacking spectra. For highest precision the data in HDU #2 is likely to be used."</p></blockquote> <p>This is a duplicate of <a href="https://pfspipe.ipmu.jp/jira/browse/DAMD-63" title="Redesign and implement pfsObject FluxTbl" class="issue-link" data-issue-key="DAMD-63"><del>DAMD-63</del></a>.</p> Relates PIPE2D-344 Development Rank 0|02qpt6:508yl03z1 Sprint 2DDRP-2019 C 2DDRP-2019 H Story Points 3.0