[ncl-talk] Could NCL open GrADS Data Server

[Dennis Shea]

re: " ... perhaps historically invalid naming in NetCDF 3"

I believe that classic netCDF or, perhaps, the netCDG Users Group (NUG),
does not allow or recommends against certain characters.

https://www.ncl.ucar.edu/Document/Manuals/language_man.pdf
page 13

   x = f->$


An excellent NCL tutorial is at:
      https://www.ncl.ucar.edu/Document/Manuals/NCL_User_Guide/


On Sun, Aug 13, 2017 at 8:15 AM, Rick Brownrigg <brownrig at ucar.edu> wrote:

> 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
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> ncl-talk mailing list
>>>>> ncl-talk at ucar.edu
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>>>>>
>>>>
>>>
>>> --
>>> Envoyé avec Gmail Mobile
>>>
>>
>>
>>
>> --
>> ------------------------------
>> Cordialement,
>> Best regards,
>> Rabah Hachelaf
>>
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>
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