{"action":"created","issue":{"url":"https://api.github.com/repos/lofar-astron/factor/issues/133","repository_url":"https://api.github.com/repos/lofar-astron/factor","labels_url":"https://api.github.com/repos/lofar-astron/factor/issues/133/labels{/name}","comments_url":"https://api.github.com/repos/lofar-astron/factor/issues/133/comments","events_url":"https://api.github.com/repos/lofar-astron/factor/issues/133/events","html_url":"https://github.com/lofar-astron/factor/issues/133","id":174951656,"number":133,"title":"calibration is going wrong in wsclean banch","user":{"login":"wllwen007","id":2170761,"avatar_url":"https://avatars.githubusercontent.com/u/2170761?v=3","gravatar_id":"","url":"https://api.github.com/users/wllwen007","html_url":"https://github.com/wllwen007","followers_url":"https://api.github.com/users/wllwen007/followers","following_url":"https://api.github.com/users/wllwen007/following{/other_user}","gists_url":"https://api.github.com/users/wllwen007/gists{/gist_id}","starred_url":"https://api.github.com/users/wllwen007/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wllwen007/subscriptions","organizations_url":"https://api.github.com/users/wllwen007/orgs","repos_url":"https://api.github.com/users/wllwen007/repos","events_url":"https://api.github.com/users/wllwen007/events{/privacy}","received_events_url":"https://api.github.com/users/wllwen007/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":50,"created_at":"2016-09-04T14:31:42Z","updated_at":"2016-10-28T10:29:33Z","closed_at":null,"body":"Something is going very wrong in the calibration steps in my wsclean selfcal (run using last commit on 2 Sept : https://github.com/lofar-astron/factor/commit/2b1b9f89a021a735f379ff761f342186775193e2). This worked not too long ago using **casa** as the selfcal imager --  successful casa selfcal ran on around 2016-08-17.\r\n\r\nSelfcal images (just the first one of each stage) from casa:\r\n![l343224_sb000_uv dppp_1265693adt_121g pre-cal_chunk9_12656e849t_0g casa_image02 image tt0](https://cloud.githubusercontent.com/assets/2170761/18231322/05e86584-72af-11e6-8738-c6de4cf3a3b2.png)\r\n![l343224_sb000_uv dppp_1265693adt_121g pre-cal_chunk9_12656e80ft_0g casa_image12 image tt0](https://cloud.githubusercontent.com/assets/2170761/18231312/caa42eb8-72ae-11e6-8bad-6f74ee0c5932.png)\r\n![l343224_sb000_uv dppp_1265693adt_121g pre-cal_chunk9_12656e80ft_0g casa_image32 image tt0](https://cloud.githubusercontent.com/assets/2170761/18231315/dc7b64a8-72ae-11e6-9cd7-fab725aa6948.png)\r\n\r\nAnd from wsclean:\r\n![l343224_sb000_uv dppp_1265693adt_166g pre-cal_chunk7 wsclean_image02-mfs-image](https://cloud.githubusercontent.com/assets/2170761/18231337/2da3620e-72af-11e6-958c-b585f67a2195.png)\r\n![l343224_sb000_uv dppp_1265693adt_121g pre-cal_chunk7_12656e5b6t_4g wsclean_image12-mfs-image](https://cloud.githubusercontent.com/assets/2170761/18231335/2d9df5e4-72af-11e6-89c9-692c4853bcc0.png)\r\n![l343224_sb000_uv dppp_1265693adt_121g pre-cal_chunk7_12656e5b6t_4g wsclean_image42_iter0-mfs-image](https://cloud.githubusercontent.com/assets/2170761/18231336/2da3467a-72af-11e6-8328-0aa061663c3f.png)\r\n\r\nObviously the calibration is not working as it should (and did before). I can see a lot of jumps in the phase solutions and strange 'double line' solutions -- one of the worst case examples is:\r\nhttp://stri-cluster.herts.ac.uk/~wwilliams/factor/selfcal/wsclean/L343224_SB000_uv.dppp_1265693ADt_121g.pre-cal_chunk7_12656E5B6t_4g.make_selfcal_plots_tec_scalarphase_channel1.png\r\n(just a link to save putting these large images up here)\r\n\r\n\r\n\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/lofar-astron/factor/issues/comments/256888517","html_url":"https://github.com/lofar-astron/factor/issues/133#issuecomment-256888517","issue_url":"https://api.github.com/repos/lofar-astron/factor/issues/133","id":256888517,"user":{"login":"darafferty","id":5547918,"avatar_url":"https://avatars.githubusercontent.com/u/5547918?v=3","gravatar_id":"","url":"https://api.github.com/users/darafferty","html_url":"https://github.com/darafferty","followers_url":"https://api.github.com/users/darafferty/followers","following_url":"https://api.github.com/users/darafferty/following{/other_user}","gists_url":"https://api.github.com/users/darafferty/gists{/gist_id}","starred_url":"https://api.github.com/users/darafferty/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/darafferty/subscriptions","organizations_url":"https://api.github.com/users/darafferty/orgs","repos_url":"https://api.github.com/users/darafferty/repos","events_url":"https://api.github.com/users/darafferty/events{/privacy}","received_events_url":"https://api.github.com/users/darafferty/received_events","type":"User","site_admin":false},"created_at":"2016-10-28T10:29:33Z","updated_at":"2016-10-28T10:29:33Z","body":"Yes, we use \"wsclean -predict\" with -channelsout greater than 1 when more than 50 subbands are used. We also pad the model images with zeros before calling WSClean and pass the new, padded size to it with the -size argument. A typical call looks like:\r\n\r\n```\r\nwsclean -size 1024 1024 -channelsout 10 -tempdir /tmp -j 2 -mem 30.0 -name L340796_SBgr000-12_uv.dppp.dpppaverage_chunk11_126407A6Ct_0g.wsclean_image02 -scale 0.000416666666667 -predict L340796_SBgr000-12_uv.dppp.dpppaverage_chunk0_126400A74t_0g.mssort_into_Groups L340796_SBgr000-12_uv.dppp.dpppaverage_chunk0_126400A74t_1g.mssort_into_Groups L340796_SBgr000-12_uv.dppp.dpppaverage_chunk0_126400A74t_2g.mssort_into_Groups L340796_SBgr000-12_uv.dppp.dpppaverage_chunk0_126400A74t_3g.mssort_into_Groups L340796_SBgr000-12_uv.dppp.dpppaverage_chunk0_126400A74t_4g.mssort_into_Groups\r\n```\r\n\r\nwhere each of the 5 MS files have 4 channels each."}}
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