<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi, Andrew -- <div><br><div><div>On May 29, 2012, at 4:46 PM, Andrew Friedman wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi GrADS users,<br><br>I have a small question about best practices for writing a control file for 365 day calendar output.<br><br>I've been succesfully able to open CMIP3 model monthly netcdf files with a 365 calendar using xdfopen,<br>following previous instructions on the GrADS forum:<br><a href="http://gradsusr.org/pipermail/gradsusr/2011-June/013406.html">http://gradsusr.org/pipermail/gradsusr/2011-June/013406.html</a><br><br>with a line like 'TDEF time 1560 LINEAR 16Jan1870 1mo' in the control file<br></div></blockquote><div>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. </div><br><blockquote type="cite"><div><br>Is it important that I also include the line<br>' OPTIONS 365_day_calendar' <br>in the control file when I am opening monthly data? </div></blockquote>No, because 365-day calendars do not affect time handling for monthly time axes.</div><div><br><blockquote type="cite"><div>Or is this only important for daily data?<br></div></blockquote>The 365_day_calendar option is essential for daily or hourly time axes. </div><div><br><blockquote type="cite"><div>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><br>Thanks much,<br>Andrew<br><br><br>Andrew Friedman<br>Graduate Student, UC Berkeley Geography<br><a href="mailto:andfried@berkeley.edu">andfried@berkeley.edu</a><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"> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>--</div><div>Jennifer M. Adams</div><div>IGES/COLA</div><div>4041 Powder Mill Road, Suite 302</div><div>Calverton, MD 20705</div><div><a href="mailto:jma@cola.iges.org">jma@cola.iges.org</a></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></span></div></span> </div><br></div></body></html>