{"action":"created","issue":{"url":"https://api.github.com/repos/lofar-astron/prefactor/issues/93","repository_url":"https://api.github.com/repos/lofar-astron/prefactor","labels_url":"https://api.github.com/repos/lofar-astron/prefactor/issues/93/labels{/name}","comments_url":"https://api.github.com/repos/lofar-astron/prefactor/issues/93/comments","events_url":"https://api.github.com/repos/lofar-astron/prefactor/issues/93/events","html_url":"https://github.com/lofar-astron/prefactor/issues/93","id":181107596,"number":93,"title":"Investigate weighting of visibilities","user":{"login":"twshimwell","id":12065270,"avatar_url":"https://avatars.githubusercontent.com/u/12065270?v=3","gravatar_id":"","url":"https://api.github.com/users/twshimwell","html_url":"https://github.com/twshimwell","followers_url":"https://api.github.com/users/twshimwell/followers","following_url":"https://api.github.com/users/twshimwell/following{/other_user}","gists_url":"https://api.github.com/users/twshimwell/gists{/gist_id}","starred_url":"https://api.github.com/users/twshimwell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/twshimwell/subscriptions","organizations_url":"https://api.github.com/users/twshimwell/orgs","repos_url":"https://api.github.com/users/twshimwell/repos","events_url":"https://api.github.com/users/twshimwell/events{/privacy}","received_events_url":"https://api.github.com/users/twshimwell/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-10-05T09:40:57Z","updated_at":"2016-10-05T09:47:24Z","closed_at":null,"body":"For the LBA the WEIGHT_SPECTRUM is not optimal. This will be similar on the HBA and perhaps should be made more optimal in the prefactor pipeline.\r\n\r\nFrancesco suggested this issue is due to:\r\n\r\nThe calculation of the weights is presently done with 1/autocorr which is correct in a time/freq cell but might fail when a longer time/freq chunk of data is used. \r\n\r\nThe solution he suggested was:\r\n\r\nUpdate the weights with the updateweight=True in NDPPP in two steps: 1. when applying the bandpass (correct for the freq-dep) and 2. when applying the element beam (correct for the time-dep). Alternatively the weights have to be recalculated after the major amplitude corrections are applied.\r\n"},"comment":{"url":"https://api.github.com/repos/lofar-astron/prefactor/issues/comments/251630370","html_url":"https://github.com/lofar-astron/prefactor/issues/93#issuecomment-251630370","issue_url":"https://api.github.com/repos/lofar-astron/prefactor/issues/93","id":251630370,"user":{"login":"AHorneffer","id":900708,"avatar_url":"https://avatars.githubusercontent.com/u/900708?v=3","gravatar_id":"","url":"https://api.github.com/users/AHorneffer","html_url":"https://github.com/AHorneffer","followers_url":"https://api.github.com/users/AHorneffer/followers","following_url":"https://api.github.com/users/AHorneffer/following{/other_user}","gists_url":"https://api.github.com/users/AHorneffer/gists{/gist_id}","starred_url":"https://api.github.com/users/AHorneffer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/AHorneffer/subscriptions","organizations_url":"https://api.github.com/users/AHorneffer/orgs","repos_url":"https://api.github.com/users/AHorneffer/repos","events_url":"https://api.github.com/users/AHorneffer/events{/privacy}","received_events_url":"https://api.github.com/users/AHorneffer/received_events","type":"User","site_admin":false},"created_at":"2016-10-05T09:47:24Z","updated_at":"2016-10-05T09:47:24Z","body":"So essentially just set `updateweights=True`  in the `applygain` and `applybeam` steps of the `ndppp_prep_target` step of the target pipeline?"}}
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