<html><head><style type=text/css><!--
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--></style></head><body>have you tried to modify the ctl replacing -360 with 0?<div>davide<br><div><br><br><br><div><strong>
From:
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Raphael Ranieri <raphaelcr93@hotmail.com>
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To:
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"gradsusr@gradsusr.org" <gradsusr@gradsusr.org>
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Sent:
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8/11/2020 11:07 PM
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Subject:
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[gradsusr] Negative Longitude of -360 in xdef of ctl file
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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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