issue_comments: 280726382
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html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | performed_via_github_app | issue |
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https://github.com/pydata/xarray/pull/1252#issuecomment-280726382 | https://api.github.com/repos/pydata/xarray/issues/1252 | 280726382 | MDEyOklzc3VlQ29tbWVudDI4MDcyNjM4Mg== | 6200806 | 2017-02-17T18:18:48Z | 2017-02-17T18:18:48Z | CONTRIBUTOR | @spencerkclark @shoyer I got some more concrete information c.f. on my previous comment on negative and/or 5 digit dates. The TRACE simulation outputs netCDF files uses units of thousands of years relative to 1950, and therefore doesn't use 5 integers. But it does use negative and positive floats...negative for <1950, positive for >1950. Re: 5 digits, there is growing research interest in very long climate model integrations, e.g. http://www.longrunmip.org/, but even those for now appear <10k yr in duration. But there are also so called EMICs (Earth Models of Intermediate Complexity) that are cheap to run for 1000s of years. Although I couldn't immediately find any published results using them for >10k yr duration... So ultimately I'd say there definitely exists a use-case for negative times (albeit with odd format) and there likely exists a use-case for 5 digit years. IMHO these are not must-haves for the initial netcdftime implementation but should at least be kept in mind, i.e. code design that makes them not-overly-difficult to introduce eventually. I suspect there are xarray users with more direct experience with these cases...feel free to chime in |
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