{"action":"created","issue":{"url":"https://api.github.com/repos/LSSTDESC/DC2-production/issues/259","repository_url":"https://api.github.com/repos/LSSTDESC/DC2-production","labels_url":"https://api.github.com/repos/LSSTDESC/DC2-production/issues/259/labels{/name}","comments_url":"https://api.github.com/repos/LSSTDESC/DC2-production/issues/259/comments","events_url":"https://api.github.com/repos/LSSTDESC/DC2-production/issues/259/events","html_url":"https://github.com/LSSTDESC/DC2-production/issues/259","id":357019279,"node_id":"MDU6SXNzdWUzNTcwMTkyNzk=","number":259,"title":"1.2i validation updates","user":{"login":"fjaviersanchez","id":13971732,"node_id":"MDQ6VXNlcjEzOTcxNzMy","avatar_url":"https://avatars3.githubusercontent.com/u/13971732?v=4","gravatar_id":"","url":"https://api.github.com/users/fjaviersanchez","html_url":"https://github.com/fjaviersanchez","followers_url":"https://api.github.com/users/fjaviersanchez/followers","following_url":"https://api.github.com/users/fjaviersanchez/following{/other_user}","gists_url":"https://api.github.com/users/fjaviersanchez/gists{/gist_id}","starred_url":"https://api.github.com/users/fjaviersanchez/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fjaviersanchez/subscriptions","organizations_url":"https://api.github.com/users/fjaviersanchez/orgs","repos_url":"https://api.github.com/users/fjaviersanchez/repos","events_url":"https://api.github.com/users/fjaviersanchez/events{/privacy}","received_events_url":"https://api.github.com/users/fjaviersanchez/received_events","type":"User","site_admin":false},"labels":[{"id":731041964,"node_id":"MDU6TGFiZWw3MzEwNDE5NjQ=","url":"https://api.github.com/repos/LSSTDESC/DC2-production/labels/validation","name":"validation","color":"b60205","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":9,"created_at":"2018-09-05T00:08:49Z","updated_at":"2018-09-06T03:02:25Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"In this issue I wanted to keep track of the status of the validation of 1.2i.\r\n\r\n1) Exposure checker: @kadrlica found some issues with the sky level gradients. More details at the #desc-dc2-eyeballs channel. Follow up needed for run 2.0.\r\n\r\n2) Preliminary comparisons of calexps between imSim KNL and imSim Haswell show perfect agreement (only g-band available for now):\r\n\r\nHere I am plotting the difference between the position of the detected objects in 100 imSim KNL visits (`src` catalogs) and imSim Haswell visits, the detected objects lie in the same exact positions:\r\n\r\n![test_astrometry_imsim_knl_vs_phosim](https://user-images.githubusercontent.com/13971732/45062886-e4b13300-b05f-11e8-9af3-d61f42e6eb21.png)\r\n\r\nI am showing a cutout to demonstrate that the centroids lie in the same positions:\r\n\r\n![test_imsim_knl_2018_09_04_v_imsim_haswell](https://user-images.githubusercontent.com/13971732/45062888-e7ac2380-b05f-11e8-9734-dd50b1dd1665.png)\r\n\r\nAnd here I am plotting the difference of Kron measured magnitude for the same catalogs. Again the agreement is perfect:\r\n\r\n![test_magnitudes_imsim_knl_vs_imsim_haswell](https://user-images.githubusercontent.com/13971732/45062890-ea0e7d80-b05f-11e8-89fb-1d4c53bd9fb0.png)\r\n\r\n3) Preliminary comparisons between imSim and PhoSim show good agreement. PhoSim's sources appear to be brighter given the missing extinction. The comparison's been made in g-band only (for now):\r\n\r\nHere I compare the position of PhoSim detected objects with matched imSim detected objects:\r\n\r\n![test_astrometry_imsim_knl_vs_phosim](https://user-images.githubusercontent.com/13971732/45062942-2fcb4600-b060-11e8-924d-1895f65952be.png)\r\n\r\nAnd here I compare their Kron measured magnitudes:\r\n\r\n![test_magnitudes_imsim_knl_vs_phosim](https://user-images.githubusercontent.com/13971732/45062946-348ffa00-b060-11e8-8996-e3fb23ff867f.png)\r\n\r\nFinally I show a cutout with imSim image and the measured centroids for PhoSim (+) and imSim (x):\r\n![test_imsim_knl_2018_09_04_v_phosim](https://user-images.githubusercontent.com/13971732/45062949-35c12700-b060-11e8-9ce3-ed99f6bd6b79.png)\r\n\r\n4) Preliminary comparisons between imSim and the truth catalog show good agreement.\r\n\r\n4.1: i-band (using 100 sensor/visits)\r\n\r\nAstrometry residuals for the calibration objects (are we still using some galaxies or are these matching mistakes??)\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063007-8e90bf80-b060-11e8-86f0-8e28377a5955.png)\r\n\r\nPhotometric residuals for calibration objects only\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063035-baac4080-b060-11e8-9c16-15cdc1feb41c.png)\r\n\r\nPhotometric residuals for stars (`extendedness==0` and matched to a star in the input catalog):\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063066-e16a7700-b060-11e8-84eb-96ebdfafa169.png)\r\n\r\nAstrometric residuals for stars (defined as above)\r\n![image](https://user-images.githubusercontent.com/13971732/45063093-0232cc80-b061-11e8-94d9-1b24b61f8535.png)\r\n\r\nDetection efficiency of stars:\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063112-242c4f00-b061-11e8-9ee4-1dc7f461e508.png)\r\n\r\n4.2 g-band (300 visits for now)\r\n\r\nPhotometric residuals for calibration objects only:\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063736-6905b500-b064-11e8-8ae6-d32de54c9d3c.png)\r\n\r\nAstrometric residuals for calibration objects only:\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063745-7ae75800-b064-11e8-9d68-fd82cda642b3.png)\r\n\r\nPhotometric residuals for stars (defined as above):\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063755-89357400-b064-11e8-8d6b-c45191b63883.png)\r\n\r\nAstrometric residuals for stars:\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063806-e0d3df80-b064-11e8-822d-57007c12d84d.png)\r\n\r\nDetection efficiency for stars:\r\n\r\n![image](https://user-images.githubusercontent.com/13971732/45063973-ec73d600-b065-11e8-8ed8-7a8ee08778be.png)\r\n\r\n5) Background power-spectra checks show compatibility between PhoSim and imSim ([see DC2 presentation on August 31st](https://docs.google.com/presentation/d/1HKXn1D9p0r3PHK9NlHY5s_PQ1eZjbJatn_pGQIir3T8/edit#slide=id.g4137bb6894_17_5))\r\n\r\n\r\nShould we be worried about these astrometric residuals in g-band? @RobertLuptonTheGood @wmwv @jchiang87 @cwwalter \r\n\r\nFor g-band I am using visits 159494 and 183811."},"comment":{"url":"https://api.github.com/repos/LSSTDESC/DC2-production/issues/comments/418948739","html_url":"https://github.com/LSSTDESC/DC2-production/issues/259#issuecomment-418948739","issue_url":"https://api.github.com/repos/LSSTDESC/DC2-production/issues/259","id":418948739,"node_id":"MDEyOklzc3VlQ29tbWVudDQxODk0ODczOQ==","user":{"login":"rmjarvis","id":623887,"node_id":"MDQ6VXNlcjYyMzg4Nw==","avatar_url":"https://avatars3.githubusercontent.com/u/623887?v=4","gravatar_id":"","url":"https://api.github.com/users/rmjarvis","html_url":"https://github.com/rmjarvis","followers_url":"https://api.github.com/users/rmjarvis/followers","following_url":"https://api.github.com/users/rmjarvis/following{/other_user}","gists_url":"https://api.github.com/users/rmjarvis/gists{/gist_id}","starred_url":"https://api.github.com/users/rmjarvis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rmjarvis/subscriptions","organizations_url":"https://api.github.com/users/rmjarvis/orgs","repos_url":"https://api.github.com/users/rmjarvis/repos","events_url":"https://api.github.com/users/rmjarvis/events{/privacy}","received_events_url":"https://api.github.com/users/rmjarvis/received_events","type":"User","site_admin":false},"created_at":"2018-09-06T03:02:25Z","updated_at":"2018-09-06T03:02:25Z","author_association":"NONE","body":"I can easily imagine 0.34 magnitudes shallow being due to less than optimal choices for various parameters in the object detection step.  I'm more familiar with SExtractor's parameters (which I don't claim to really understand -- just that I have more familiarity with them), but I assume there are analogous parameters to its N sigma above the noise and how many contiguous detected pixels are required.  With SExtractor at least, poor choices for these can lead to significantly fewer detections.\r\n\r\nSo, do we know what values were used here?  And whether these can be tweaked to maybe probe slightly fainter objects?"}}
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