[gradsusr] Negative Longitude of -360 in xdef of ctl file

[Davide Sacchetti]

have you tried to modify the ctl replacing -360 with 0?
davide





 From:   Raphael Ranieri <raphaelcr93 at hotmail.com> 
 To:   "gradsusr at gradsusr.org" <gradsusr at gradsusr.org> 
 Sent:   8/11/2020 11:07 PM 
 Subject:   [gradsusr] Negative Longitude of -360 in xdef of ctl file 


 
 
 Hello All, 

 
I'm trying to use some files of a Brazillian institute of meteorology and I'm facing a problem with the longitude values. 

 
They used grads to create a ctl file that can be accessed in this FTP from the institution: 
http://ftp.cptec.inpe.br/modelos/tempo/BAM/TQ0666L064/recortes/regioes/2020/07/29/00/BAM_CO_2020072900.ctl 

 

 

 
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: 
http://cola.gmu.edu/grads/gadoc/descriptorfile.html#XDEF 

 

 
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. 

 
We are not using Grads to open the file, we are using pygrib ... to use it in a python program. 

 
Since this ctl file is generated by grads we tought you guys could help. 

 
Do you know why the longitude is starting at -360? 

 
Thanks in advance! 

 
Raphael Ranieri 
 
 
 
 
 

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