{"action":"created","issue":{"url":"https://api.github.com/repos/NOAA-PMEL/Ferret/issues/824","repository_url":"https://api.github.com/repos/NOAA-PMEL/Ferret","labels_url":"https://api.github.com/repos/NOAA-PMEL/Ferret/issues/824/labels{/name}","comments_url":"https://api.github.com/repos/NOAA-PMEL/Ferret/issues/824/comments","events_url":"https://api.github.com/repos/NOAA-PMEL/Ferret/issues/824/events","html_url":"https://github.com/NOAA-PMEL/Ferret/issues/824","id":276264050,"number":824,"title":"Investigate precision of time coordinate information in descriptor files","user":{"login":"karlmsmith","id":16406727,"avatar_url":"https://avatars0.githubusercontent.com/u/16406727?v=4","gravatar_id":"","url":"https://api.github.com/users/karlmsmith","html_url":"https://github.com/karlmsmith","followers_url":"https://api.github.com/users/karlmsmith/followers","following_url":"https://api.github.com/users/karlmsmith/following{/other_user}","gists_url":"https://api.github.com/users/karlmsmith/gists{/gist_id}","starred_url":"https://api.github.com/users/karlmsmith/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/karlmsmith/subscriptions","organizations_url":"https://api.github.com/users/karlmsmith/orgs","repos_url":"https://api.github.com/users/karlmsmith/repos","events_url":"https://api.github.com/users/karlmsmith/events{/privacy}","received_events_url":"https://api.github.com/users/karlmsmith/received_events","type":"User","site_admin":false},"labels":[{"id":323826821,"url":"https://api.github.com/repos/NOAA-PMEL/Ferret/labels/bug","name":"bug","color":"fc2929","default":true},{"id":757390769,"url":"https://api.github.com/repos/NOAA-PMEL/Ferret/labels/P:%20high","name":"P: high","color":"f9d0c4","default":false},{"id":758304202,"url":"https://api.github.com/repos/NOAA-PMEL/Ferret/labels/S:%20normal","name":"S: normal","color":"fbca04","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2017-11-23T04:30:25Z","updated_at":"2017-11-23T04:30:46Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"**Reported by Ansley B Manke on 16 Nov 2007 18:40 UTC**\nMartin Schmidt wrote the message below, in response to another user having\ntroubles with descriptor files. Coordinate data from the netCDF stepfiles is\nused in double precision. Is the timestep information given in the descriptor\nfile S_START, S_END and S_DELTA read and used in single or double precision?\n\n> However, I am experiencing similar strange netcdf-errors when \n> using descriptor files to concatinate a large number of \n> netcdf files (> 300). My explanation is, that ferret can only do\n> calculations with single accuracy. With many time steps the time\n> calculated from S_START, S_END and S_DELTA may be inaccurate. This\n> results in errors when plotting a time series (file not found, \n> variable not found ...). It may also\n> happen that some time slices are missing, when data from the\n> end of the data set are used and the times displayed are wrong\n> in this case.\n\n> Mostly it helps, to play around with the values\n> of S_START, S_END and S_DELTA . For example it may resolve\n> the problem to replace 3.1366667 by 3.136667 or 3.13666667.\n> \"show data\" at least must show the correct number of time slices.\n> This is not really satisfying, but I could not find another\n> solution.\n\nMigrated-From: http://dunkel.pmel.noaa.gov/trac/ferret/ticket/1552"},"comment":{"url":"https://api.github.com/repos/NOAA-PMEL/Ferret/issues/comments/346530131","html_url":"https://github.com/NOAA-PMEL/Ferret/issues/824#issuecomment-346530131","issue_url":"https://api.github.com/repos/NOAA-PMEL/Ferret/issues/824","id":346530131,"user":{"login":"karlmsmith","id":16406727,"avatar_url":"https://avatars0.githubusercontent.com/u/16406727?v=4","gravatar_id":"","url":"https://api.github.com/users/karlmsmith","html_url":"https://github.com/karlmsmith","followers_url":"https://api.github.com/users/karlmsmith/followers","following_url":"https://api.github.com/users/karlmsmith/following{/other_user}","gists_url":"https://api.github.com/users/karlmsmith/gists{/gist_id}","starred_url":"https://api.github.com/users/karlmsmith/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/karlmsmith/subscriptions","organizations_url":"https://api.github.com/users/karlmsmith/orgs","repos_url":"https://api.github.com/users/karlmsmith/repos","events_url":"https://api.github.com/users/karlmsmith/events{/privacy}","received_events_url":"https://api.github.com/users/karlmsmith/received_events","type":"User","site_admin":false},"created_at":"2017-11-23T04:30:46Z","updated_at":"2017-11-23T04:30:46Z","author_association":"CONTRIBUTOR","body":"**Comment by ansley.b.manke on 21 Mar 2012 17:51 UTC**\nS_START, S_END, and S_DELTA have always been defined as REAL*8, back to the earliest versions we have in svn.  This would say that in the descriptor file Martin is talking about, they could be listed with more digits than what was in the examples quoted in the message, 3.1366667, according to what is in the stepfiles.\r\n\r\nThere still may have been other parts of calculations that were done in single precision, and so testing these descriptor files with double-precision Ferret would be useful.  "}}
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