Charge:
The official charge is given at - DM-11819Getting issue details... STATUS (which has been assigned LDM-582).
A synopsis is:
- to identify the amount of loss that is considered allowable with respect to the LSST science requirements if a lossy compression were used,
- to provide a recommendation on a lossy compression strategy for use within LSST pipelines along with a quantitative estimate of its impact on the sizing models LDM-144.
Meeting Information:
- Currently scheduled to be weekly on Mondays at 10am PT (Noon CDT, 1 EDT)
- Using https://bluejeans.com/343370910
- A SLACK channel (#lossy_compression_wg) now exists for discussions by this group
Meeting Minutes:
- 2017-09-18 Lossy Compression WG Meeting notes
- 2017-09-25 Lossy Compression WG Meeting notes
- 2017-10-02 Lossy Compression WG Meeting notes
- 2017-10-16 Lossy Compression WG Meeting notes
- 2017-10-23 Lossy Compression WG Meeting notes
- 2017-10-30 Lossy Compression WG Meeting notes
- 2017-11-20 Lossy Compression WG Meeting notes
- 2017-11-27 Lossy Compression WG Meeting notes
- 2017-12-04 Lossy Compression WG Meeting notes
- 2017-12-11 Lossy Compression WG Meeting notes
- 2017-12-18 Lossy Compression WG Meeting notes
- 2018-01-08 Lossy Compression WG Meeting notes
- 2018-01-22 Lossy Compression WG Meeting notes
- 2018-01-29 Lossy Compression WG Meeting notes (canceled)
- 2018-02-05 Lossy Compression WG Meeting notes
- 2018-02-12 Lossy Compression WG Meeting notes
- 2018-02-19 Lossy Compression WG Meeting notes
- 2018-02-26 Lossy Compression WG Meeting notes
- 2018-04-16 Lossy Compression WG Meeting notes
Other Resources:
- Current draft of the Working Group Charge (LDM-582) is present in this git repo.
- PDF of a presentation on some tests made when implementing FPACK within DES.
- Summary page with description of AP pipeline (to help guide where compression might be used and impact L1 processing) is here.
Members:
- Robert Gruendl (NCSA, Chair)
- Paul Price (Princeton)
- Bob Armstrong (Princeton, WL)
- Krzysztof Findesien (UW, Alert Production)
- Sophie Reed (Princeton)
- Ben Emmons (Tucson, observer)
2 Comments
Gregory Dubois-Felsmann
The WG should be aware of the mention of compression in the system-level requirements document LSE-30, in OSS-REQ-0111, "Science Image Archiving Reliability", which basically says that images must be archived exactly, except:
So this "no effect on any SRD requirement" condition is something this working group needs to address - perhaps first by defining more precisely what this constraint means, and then by evaluating this condition against specific compression levels.
Gregory Dubois-Felsmann
Strictly speaking, the way this requirement is written, it applies only to raw images.