[ncl-talk] Reading ECMWF THREDDS data using OPENDAP

Fri Sep 11 15:14:27 MDT 2015

Dave,

I didn't see any response to this. Was it ever resolved?

The issue is that these files are not being served by an OPeNDAP server,
and hence you can't open them with an OPeNDAP-enabled client.

--Mary

On Fri, Sep 4, 2015 at 3:29 PM, Vollaro, David <dvollaro at albany.edu> wrote:

> Hi,
>
>
> I am trying to read an ECMWF dataset from the NCAR RDA THREDDS servver
> using NCL.
>
> I am using the example OPENDAP script from NCL but am having trouble
> accessing the data.
>
>
> The snippet of the NCL script I am using is below, as is the link to the
> datasset I am trying to access.
>
> I have sucessfully accessed data using OPENDAP before, so I am hoping that
> it is just an incorrecct
>
> link-id.  I am running 6.1.2...Thanks...
>
>
> Dave Vollaro
>
>
> --------------- code snippet --------------
>
>   url = "http://rda.ucar.edu/thredds/fileServer/aggregations/e/ds627.0/15/
> "
> filename = url +
> "ERA_Interim_atmospheric_model_forecast_for_surface-198808/files/ei.oper.fc.sfc.regn128sc.1988080100"
> print(filename)
> ;***********************************************
> ;  DATA SOURCE
> ;***********************************************
>
>   exists = isfilepresent(filename)
>   if(.not.exists) then
>     print("OPeNDAP isfilepresent test unsuccessful.")
>     print("File doesn't exist or NCL doesn't have OPeNDAP ability on this
> system")
>   else
>     print("OPeNDAP isfilepresent test successful.")
>     file_nc = addfile(filename,"r")
>   end if
>   names = getfilevarnames(file_nc)          ;Get the variable names in the
>   print(names)                               ;GRIB file and print them out.
> end
>
>
> --------- end snippet-------
>
>   link:
>
> http://rda.ucar.edu/thredds/catalog/aggregations/e/ds627.0/15/ERA_Interim_atmospheric_model_forecast_for_surface-198808/catalog.html?dataset=aggregations/e/ds627.0/15/ERA_Interim_atmospheric_model_forecast_for_surface-198808/files/ei.oper.fc.sfc.regn128sc.1988080100
>
>
>
> error:
>
> (0)
> http://rda.ucar.edu/thredds/fileServer/aggregations/e/ds627.0/15/ERA_Interim_atmospheric_model_forecast_for_surface-198808/files/ei.oper.fc.sfc.regn128sc.1988080100
> syntax error, unexpected WORD_WORD, expecting SCAN_ATTR or SCAN_DATASET or
> SCAN_ERROR
> context: <html^><head><title>Apache Tomcat/7.0.63 - Error
> report</title><style><!--H1
> {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
> H2
> {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
> H3
> {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
> BODY
> {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
> {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;}
> P
> {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A
> {color : black;}A.name {color : black;}HR {color : #525D76;}--></style>
> </head><body><h1>HTTP Status 401 - </h1><HR size="1"
> noshade="noshade"><p><b>type</b> Status report</p><p><b>message</b>
> <u></u></p><p><b>description</b> <u>This request requires HTTP
> authentication.</u></p><HR size="1" noshade="noshade"><h3>Apache
> Tomcat/7.0.63</h3></body></html>
> ncopen: filename "
> http://rda.ucar.edu/thredds/fileServer/aggregations/e/ds627.0/15/ERA_Interim_atmospheric_model_forecast_for_surface-198808/files/ei.oper.fc.sfc.regn128sc.1988080100":
> NetCDF: Malformed or inaccessible DAP DDS
> (0)     OPeNDAP isfilepresent test unsuccessful.
> (0)     File doesn't exist or NCL doesn't have OPeNDAP ability on this
> system
>
>
>
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