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Hello Clay,</div>
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Thank you for the answer.</div>
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Actually if I subtract 360 from the long I will get -360 longitude as well<br>
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Opening the file and asking to print the max and min longitude, I checked that it is from 0 to 360.0000000000111</div>
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See:</div>
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If I print point by point values with respective Lat and Long I also get longitude of 360 in the end:</div>
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I thought it could be a custom projection or something like that, but in ctl it is not specifying anything.</div>
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I sent a message to the institute also, but didn't get an answer.</div>
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I'm very confused.</div>
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If anyone have any other hint I appreciate a lot.</div>
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Regards,</div>
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Raphael Ranieri</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De:</b> gradsusr <gradsusr-bounces@gradsusr.org> em nome de Raphael Ranieri <raphaelcr93@hotmail.com><br>
<b>Enviado:</b> terça-feira, 11 de agosto de 2020 18:07<br>
<b>Para:</b> gradsusr@gradsusr.org <gradsusr@gradsusr.org><br>
<b>Assunto:</b> [gradsusr] Negative Longitude of -360 in xdef of ctl file</font>
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Hello All,
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<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>
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<div>They used grads to create a ctl file that can be accessed in this FTP from the institution:</div>
<div>http://ftp.cptec.inpe.br/modelos/tempo/BAM/TQ0666L064/recortes/regioes/2020/07/29/00/BAM_CO_2020072900.ctl</div>
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<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>http://cola.gmu.edu/grads/gadoc/descriptorfile.html#XDEF</div>
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<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>
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<div>We are not using Grads to open the file, we are using pygrib ... to use it in a python program.</div>
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<div>Since this ctl file is generated by grads we tought you guys could help.</div>
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<div>Do you know why the longitude is starting at -360?</div>
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<div>Thanks in advance!</div>
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<div>Raphael Ranieri</div>
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