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Hi Irena,</div>
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Here's my understanding of latref and lonref based on the CTL for NARR data from this
<a href="https://psl.noaa.gov/data/narr/format.html" title="https://psl.noaa.gov/data/narr/format.html" id="LPNoLPOWALinkPreview">
website</a>. </div>
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The latref and lonref in your ctl file can be your first grid point from left bottom so that you can set iref and jref as 1 and 1. In the NARR example, their left bottom grid is 1 in lat and -145 in lon.</div>
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Hope this helps!</div>
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Haochen</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> gradsusr <gradsusr-bounces@gradsusr.org> on behalf of Irena Ivanova <iivanov@gmu.edu><br>
<b>Sent:</b> Thursday, May 4, 2023 16:44<br>
<b>To:</b> gradsusr@gradsusr.org <gradsusr@gradsusr.org><br>
<b>Subject:</b> [gradsusr] GRADS control file for CMAQ output (PDEF)</font>
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<div class="x_elementToProof" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi, </div>
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I need help with the GRADS control file for Lambert Conformal projection.</div>
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I understand I need to define the grid using PDEF:</div>
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* PDEF isize jsize LCC latref lonref iref jref Struelat Ntruelat slon dx dy</div>
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*Example: PDEF 103 69 lccr 30 -88 51.5 34.5 20 40 -88 90000 90000
<div class="x_ContentPasted5 x_elementToProof">*Args:</div>
<div class="x_ContentPasted5">*isize The size of the native grid in the x direction</div>
<div class="x_ContentPasted5">*jsize The size of the native grid in the y direction</div>
<div class="x_ContentPasted5">*latref reference latitude</div>
<div class="x_ContentPasted5">*lonref reference longitude (in degrees, E is positive, W is negative)</div>
<div class="x_ContentPasted5">*iref i of ref point</div>
<div class="x_ContentPasted5">*jref j of ref point</div>
<div class="x_ContentPasted5">*Struelat S true lat</div>
<div class="x_ContentPasted5">*Ntruelat N true lat</div>
<div class="x_ContentPasted5">*slon standard longitude</div>
<div class="x_ContentPasted5">*dx grid X increment in meters</div>
*dy grid Y increment in meters<br>
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Here is my PDEF line but not sure what to specify for <span class="x_ContentPasted6" style="display: inline !important; background-color: rgb(255, 255, 255);">latref=? lonref=? and not sure if the other arguments are correct:</span></div>
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pdef 442 265 lcc ??? ??? 1 1 33 45 -97. 12000 12000<br>
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Here is an example lat-lon grid that covers CONUS domain (for GRADS to interpolate onto)</div>
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xdef 1000 linear 192. 0.1169081<br class="x_ContentPasted3">
ydef 500 linear 20. 0.1169081<br>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Here are the global attributes of the CMAQ-Offline output. I can provide the data file upon request.</span><br>
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// global attributes:
<div class="x_ContentPasted0"> :IOAPI_VERSION = "ioapi-3.2: $Id: init3.F90 185 2020-08-28 16:49:45Z co" ;</div>
<div class="x_ContentPasted0"> :EXEC_ID = "CMAQ_CCTMv531_sma8_20230412_212323_441724109 " ;</div>
<div class="x_ContentPasted0"> :FTYPE = 1 ;</div>
<div class="x_ContentPasted0"> :CDATE = 2023102 ;</div>
<div class="x_ContentPasted0"> :CTIME = 212328 ;</div>
<div class="x_ContentPasted0"> :WDATE = 2023102 ;</div>
<div class="x_ContentPasted0"> :WTIME = 212328 ;</div>
<div class="x_ContentPasted0"> :SDATE = 2019209 ;</div>
<div class="x_ContentPasted0"> :STIME = 0 ;</div>
<div class="x_ContentPasted0"> :TSTEP = 10000 ;</div>
<div class="x_ContentPasted0"> :NTHIK = 1 ;</div>
<div class="x_ContentPasted0"> :NCOLS = 442 ;</div>
<div class="x_ContentPasted0"> :NROWS = 265 ;</div>
<div class="x_ContentPasted0"> :NLAYS = 35 ;</div>
<div class="x_ContentPasted0"> :NVARS = 226 ;</div>
<div class="x_ContentPasted0"> :<span style="color: rgb(237, 92, 87);">GDTYP = 2</span> ;</div>
<div class="x_ContentPasted0"> :P_ALP = 33. ;</div>
<div class="x_ContentPasted0"> :P_BET = 45. ;</div>
<div class="x_ContentPasted0"> :P_GAM = -97. ;</div>
<div class="x_ContentPasted0"> :XCENT = -97. ;</div>
<div class="x_ContentPasted0"> :YCENT = 40. ;</div>
<div class="x_ContentPasted0"> :XORIG = -2508000. ;</div>
<div class="x_ContentPasted0"> :YORIG = -1716000. ;</div>
<div class="x_ContentPasted0"> :XCELL = 12000. ;</div>
<div class="x_ContentPasted0"> :YCELL = 12000. ;</div>
<div class="x_ContentPasted0"> :VGTYP = -9999 ;</div>
<div class="x_ContentPasted0"> :VGTOP = 0.999f ;</div>
<div class="x_ContentPasted0"> :VGLVLS = 1.f, 0.995253f, 0.990479f, 0.985679f, 0.980781f, 0.975782f, 0.970684f, 0.960187f, 0.954689f, 0.936895f, 0.930397f, 0.908404f, 0.888811f, 0.862914f, 0.829314f, 0.786714f, 0.735314f, 0.645814f, 0.614214f,
0.582114f, 0.549714f, 0.511711f, 0.484394f, 0.451894f, 0.419694f, 0.388094f, 0.356994f, 0.326694f, 0.297694f, 0.270694f, 0.245894f, 0.223694f, 0.203594f, 0.154394f, 0.127094f, 0.f ;</div>
<div class="x_ContentPasted0"> :GDNAM = "AQF5X " ;</div>
<div class="x_ContentPasted0"> :UPNAM = "OPACONC " ;</div>
:VAR-LIST = "NO2 NO O O3 ...<br>
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Help much appreciated!</div>
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Irena </div>
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