<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Yes. Use 01jan1870. --Jennifer<div><br><div><div>On May 29, 2012, at 9:09 PM, Andrew Friedman wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Thank you very much, Jennifer.<br><br>One small follow-up: For monthly means using the date format without hours, is the beginning of the month preferred in e.g. '01Jan1870' over '15Jan1870'?<br><br>Andrew<br><br>On May 29, 2012, at 3:23 PM, Jennifer Adams wrote:<br><br><blockquote type="cite">Hi, Andrew -- <br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">On May 29, 2012, at 4:46 PM, Andrew Friedman wrote:<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">Hi GrADS users,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I have a small question about best practices for writing a control file for 365 day calendar output.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I've been succesfully able to open CMIP3 model monthly netcdf files with a 365 calendar using xdfopen,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">following previous instructions on the GrADS forum:<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://gradsusr.org/pipermail/gradsusr/2011-June/013406.html">http://gradsusr.org/pipermail/gradsusr/2011-June/013406.html</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">with a line like 'TDEF time 1560 LINEAR 16Jan1870 1mo' in the control file<br></blockquote></blockquote><blockquote type="cite">Many netcdf files express a monthly time axis value for January 1870 as "15.5 days since 01-01-1870." This is to place the grid point squarely in the middle of the month, to give you the idea that the value represents a monthly mean. GrADS is not so fussy about this; a date stamp of 01jan1870 is good enough to represent a january monthly mean, in fact, it is preferred over something like 12Z15jan1870. <br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Is it important that I also include the line<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">' OPTIONS 365_day_calendar' <br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">in the control file when I am opening monthly data?<br></blockquote></blockquote><blockquote type="cite">No, because 365-day calendars do not affect time handling for monthly time axes.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">Or is this only important for daily data?<br></blockquote></blockquote><blockquote type="cite">The 365_day_calendar option is essential for daily or hourly time axes. <br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">It doesn't seem to cause any changes, but I'm writing control files for many files and am wondering if there could be some differences in the time axis. <br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Thanks much,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Andrew<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Andrew Friedman<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Graduate Student, UC Berkeley Geography<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="mailto:andfried@berkeley.edu">andfried@berkeley.edu</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">_______________________________________________<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">gradsusr mailing list<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://gradsusr.org/mailman/listinfo/gradsusr">http://gradsusr.org/mailman/listinfo/gradsusr</a><br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">--<br></blockquote><blockquote type="cite">Jennifer M. Adams<br></blockquote><blockquote type="cite">IGES/COLA<br></blockquote><blockquote type="cite">4041 Powder Mill Road, Suite 302<br></blockquote><blockquote type="cite">Calverton, MD 20705<br></blockquote><blockquote type="cite"><a href="mailto:jma@cola.iges.org">jma@cola.iges.org</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">_______________________________________________<br></blockquote><blockquote type="cite">gradsusr mailing list<br></blockquote><blockquote type="cite"><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br></blockquote><blockquote type="cite"><a href="http://gradsusr.org/mailman/listinfo/gradsusr">http://gradsusr.org/mailman/listinfo/gradsusr</a><br></blockquote><br>Andrew Friedman<br><a href="mailto:andfried@berkeley.edu">andfried@berkeley.edu</a><br><br><br>_______________________________________________<br>gradsusr mailing list<br>gradsusr@gradsusr.org<br>http://gradsusr.org/mailman/listinfo/gradsusr<br></div></blockquote></div><br><div apple-content-edited="true">
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