[ncl-talk] Could NCL open GrADS Data Server

[Rick Brownrigg]

Hi,

NCL considers the dotted names as invalid syntax. I'm really not sure why
offhand -- perhaps historically invalid naming in NetCDF 3? Maybe an
outright bug? I'll check into it.

In any case, as a work-around you can use NCL's dynamic variable name
substitution feature; e.g.,

   stmp = "reports.lat"
   lats = f->$stmp$

This works for me -- its a bit cumbersome, but it will get you going.

Rick


On Sat, Aug 12, 2017 at 11:18 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca>
wrote:

> Hello,
>
> I can't read values from variables of this opendap server : "
> http://monsoondata.org:9090/dods/stn/metar/past48"
> here is the variable list :
> Variable: vnames
> Type: string
> Total Size: 112 bytes
>             14 values
> Number of Dimensions: 1
> Dimensions and sizes:   [14]
> Coordinates:
> (0)     reports.stid
> (1)     reports.lon
> (2)     reports.lat
> (3)     reports.time
> (4)     reports.cld
> (5)     reports.ds
> (6)     reports.filt
> (7)     reports.ptype
> (8)     reports.slp
> (9)     reports.ts
> (10)    reports.us
> (11)    reports.vis
> (12)    reports.vs
> (13)    reports.wx
>
> but when i try from example : tmp=f->reports.ts
> i get this error :
> Copyright (C) 1995-2017 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.4.0
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
> fatal:syntax error: line 21 in file get_obs.ncl before or near .
> temp=f->reports.
> ---------------^
>
> fatal:Syntax Error in block, block not executed
> fatal:error at line 41 in file get_obs.ncl
>
>
> Any help.
> Thank you
>
> Rabah
>
> 2017-08-12 0:51 GMT-04:00 Rabah Hachelaf <hachelaf at sca.uqam.ca>:
>
>> Thanks Rick,
>>
>> My Ncl version is 6.4 with opendap  enabled
>>
>> Rabah
>>
>>
>> Le vendredi 11 août 2017, Rick Brownrigg <brownrig at ucar.edu> a écrit :
>>
>>> Hi Rabah,
>>>
>>> I was able to open this file with an NCL:
>>>
>>>   f=addfile("http://monsoondata.org:9090/dods/stn/metar/past48","r")
>>>
>>> The response time took on the order of a minute (this evening), but it
>>> did it. Your version NCL has to be OpenDAP enabled for such a network file
>>> connection, which is optional to building NCL. Do you know where/how/what
>>> your version of NCL was built for?  I unfortunately don't know how to make
>>> NCL tell you its configuration :-/
>>>
>>> Rick
>>>
>>>
>>> On Fri, Aug 11, 2017 at 8:02 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca>
>>> wrote:
>>>
>>>> Hello NCL users,
>>>>
>>>> NCL can't open file from http://monsoondata.org:90
>>>> 90/dods/stn/metar/past48 server and return this error :
>>>>
>>>> Copyright (C) 1995-2017 - All Rights Reserved
>>>>  University Corporation for Atmospheric Research
>>>>  NCAR Command Language Version 6.4.0
>>>>  The use of this software is governed by a License Agreement.
>>>>  See http://www.ncl.ucar.edu/ for more details.
>>>> fatal:Could not open (http://monsoondata.org:9090/d
>>>> ods/stn/metar/past360)
>>>>
>>>> However GrADS open files from this server using command "open
>>>> http://monsoondata.org:9090/dods/stn/metar/past48"
>>>>
>>>> Any idea about this issue.
>>>>
>>>> Thank you
>>>> Rabah
>>>>
>>>>
>>>>
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>>>>
>>>
>>
>> --
>> Envoyé avec Gmail Mobile
>>
>
>
>
> --
> ------------------------------
> Cordialement,
> Best regards,
> Rabah Hachelaf
>
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