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<p><font size="-1">Hi Raphael,<br>
in the BAM grid the column of nodes having longitude 0 degree is
duplicated, so that you find also a column of nodes having
longitude 360 degree.<br>
This causes troubles in GrADS.<br>
You can solve it by pre-processing your grib so that you remove
the redundant nodes having longitude 360 degree, before to open
the file in GrADS.<br>
You can do it easily with a <a
href="https://code.mpimet.mpg.de/projects/cdo/">CDO</a>
command.<br>
Bash example:</font><br>
<tt><br>
</tt><tt>> fileIn=bam_0_360.grib2</tt><br>
<tt>> fileOut=bam_0_359.82.grib</tt><tt>2<br>
</tt><tt>> cdo -f grb2 sellonlatbox,0,359.82,-89.91,89.91
$fileIn $fileOut</tt><br>
<font size="-1"><br>
Marco</font></p>
<br>
<div class="moz-cite-prefix">Il 13/08/2020 16:57, Raphael Ranieri ha
scritto:<br>
</div>
<blockquote type="cite"
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Hello Clay,</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
Thank you for the answer.</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
Actually if I subtract 360 from the long I will get -360
longitude as well<br>
<br>
Opening the file and asking to print the max and min longitude,
I checked that it is from 0 to 360.0000000000111</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
See:</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
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<img size="33238" contenttype="image/png" unselectable="on"
tabindex="-1" style="color: rgb(0, 0, 0); font-family:
Calibri, Helvetica, sans-serif; font-size: 12pt; max-width:
100%; user-select: none;" data-outlook-trace="F:1|T:1"
src="cid:part2.11896D57.2E661A72@podos3d.sm" class=""><br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
If I print point by point values with respective Lat and Long I
also get longitude of 360 in the end:</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<img size="114749" contenttype="image/png" unselectable="on"
tabindex="-1" style="max-width: 100%; user-select: none;"
data-outlook-trace="F:1|T:1"
src="cid:part3.367C145A.4511706F@podos3d.sm" class=""><br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
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<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
I thought it could be a custom projection or something like
that, but in ctl it is not specifying anything.</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
I sent a message to the institute also, but didn't get an
answer.</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
I'm very confused.</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
If anyone have any other hint I appreciate a lot.</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
Regards,</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
Raphael Ranieri</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
color="#000000" face="Calibri, sans-serif"><b>De:</b> gradsusr
<a class="moz-txt-link-rfc2396E" href="mailto:gradsusr-bounces@gradsusr.org"><gradsusr-bounces@gradsusr.org></a> em nome de Raphael
Ranieri <a class="moz-txt-link-rfc2396E" href="mailto:raphaelcr93@hotmail.com"><raphaelcr93@hotmail.com></a><br>
<b>Enviado:</b> terça-feira, 11 de agosto de 2020 18:07<br>
<b>Para:</b> <a class="moz-txt-link-abbreviated" href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:gradsusr@gradsusr.org"><gradsusr@gradsusr.org></a><br>
<b>Assunto:</b> [gradsusr] Negative Longitude of -360 in xdef
of ctl file</font>
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Hello All,
<div><br>
</div>
<div>I'm trying to use some files of a Brazillian institute of
meteorology and I'm facing a problem with the longitude
values.</div>
<div><br>
</div>
<div>They used grads to create a ctl file that can be accessed
in this FTP from the institution:</div>
<div><a class="moz-txt-link-freetext" href="http://ftp.cptec.inpe.br/modelos/tempo/BAM/TQ0666L064/recortes/regioes/2020/07/29/00/BAM_CO_2020072900.ctl">http://ftp.cptec.inpe.br/modelos/tempo/BAM/TQ0666L064/recortes/regioes/2020/07/29/00/BAM_CO_2020072900.ctl</a></div>
<div><br>
</div>
<div><img size="180037" tabindex="-1" style="max-width:100%"
data-outlook-trace="F:2|T:2"
src="cid:part4.32183FE2.12F109AE@podos3d.sm" class=""><br>
</div>
<div><br>
</div>
<div>Here we can see that they are using a linear mapping for
xdef with a 0.18 step starting from a longitude of -360
degrees according to GrADs docs:</div>
<div><a class="moz-txt-link-freetext" href="http://cola.gmu.edu/grads/gadoc/descriptorfile.html#XDEF">http://cola.gmu.edu/grads/gadoc/descriptorfile.html#XDEF</a></div>
<div><br>
</div>
<div><br>
</div>
<div>Since in our case we need the actual longitude and latitude
of a point, when we try to read this file we receive
longitudes of 360 for example, which do not correspond to any
existing longitude.</div>
<div><br>
</div>
<div>We are not using Grads to open the file, we are using
pygrib ... to use it in a python program.</div>
<div><br>
</div>
<div>Since this ctl file is generated by grads we tought you
guys could help.</div>
<div><br>
</div>
<div>Do you know why the longitude is starting at -360?</div>
<div><br>
</div>
<div>Thanks in advance!</div>
<div><br>
</div>
<div>Raphael Ranieri</div>
<div>
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<br>
<div class="moz-signature">-- <br>
<i><b><small><font color="#000000" face="TrebuchetMS">Marco Biordi</font></small></b></i><br>
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