[ncl-talk] OPeNDAP

[Ehsan Taghizadeh]

 Dear JorgeThank you so much for your helpful reply.Actually, I need more help and I'll be thankful if I could have any guidance, again.
It seems the speed of reading from (https://nomads.ncep.noaa.gov:9090/dods/) and (https://thredds.ucar.edu/thredds/idd/forecastModels.html) are different and I got higher speed (but not much) from the later. Is it true?
Also, I tried to read different variables from them. Surprisingly, I took 0 (zero) for min and max for some of the variables, which it couldn't be true.
I've attched the scripts for reading from both. Following are summary of the output for printMinMax.
Reading from nomdas:$ ncl gfsopendapplotncltalk1.nclVariable: prec
(0)     ** surface total precipitation [kg/m^2]  : min=0   max=641.75

Variable: tempsfc
(0)     ** surface temperature [k]  : min=200.6   max=356.09 

Variable: temp2m
(0)     ** 2 m above ground temperature [k]  : min=208.9   max=325.9 

Variable: tempmax2m
(0)     ** 2 m above ground maximum temperature [k]  : min=0   max=0

Variable: tempmin2m
(0)     ** 2 m above ground minimum temperature [k]  : min=208.729   max=323.016 

As it could be seen "tempmax2m" has min=0 and max=0!
Reading from thredds:
 $ ncl gfsopendapplotncltalk2.ncl

Variable: prec
(0)     Total precipitation (Mixed_intervals Accumulation) @ Ground or water surface (kg.m-2) : min=0   max=0

Variable: tempsfc
(0)     Temperature @ Ground or water surface (K) : min=200.3   max=356.09

Variable: temphag
(0)     Temperature @ Specified height level above ground (K) : min=0   max=0

Variable: tempap
(0)     Apparent temperature @ Specified height level above ground (K) : min=181.281   max=328.033

Variable: tempmax
(0)     Maximum temperature (Mixed_intervals Maximum) @ Specified height level above ground (K) : min=209.532   max=327

Variable: tempmin
(0)     Minimum temperature (Mixed_intervals Minimum) @ Specified height level above ground (K) : min=0   max=0

As it could be seen "temphag" and "tempmin" have min=0 and max=0! Do you have any idea?May I ask whether anyone could plot different variables from these opendap servers?I'll be thankful for any help.
SincerelyEhsan
    On Sunday, July 5, 2020, 08:28:05 PM GMT+4:30, Jorge Humberto Bravo Méndez <jh.herk at gmail.com> wrote:  
 
 Hello Ehsan, 
you can try to plot GSF data using the nomdas opoendap server (https://nomads.ncep.noaa.gov:9090/dods/) or unidata server (https://thredds.ucar.edu/thredds/idd/forecastModels.html)
for download the gfs data you can download only your interest area in this website: (https://nomads.ncep.noaa.gov/) in grib filter, the download is much faster if you not download entire global GFS, and you can create some script for download and with a CRON job you can download periodically 
El dom., 5 jul. 2020 a las 5:00, Ehsan Taghizadeh via ncl-talk (<ncl-talk at mailman.ucar.edu>) escribió:

Dear NCL group,I hope you're doing great.
I want to plot GFS  data as a daily job. The problem is about downloading GFS  data, because of time. So, I've tried to open GFS  data from their URL (https://nomads.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/), however, it seems this URL isn't an OPeNDAP server. Am I right?May I ask if there is any OPeNDAP server to plot GFS data (forecast, 0.5, and 0.25 degrees) with a minimum delay from the mentioned URL?
Thanks in advance for any help.Ehsan_______________________________________________
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-- 
Saludos Cordiales M.Sc. Jorge H. Bravo Méndez
Investigador del Clima en eI Centro de Estudios y Pronósticos Meteorológicos
Secretaría de Protección Civil
Gobierno del Estado de Veracruz
Tel 228 1414523
Miembro de la Red de Desastres Asociados a Fenómenos Hidrometeorológicos y Climáticos (REDESClim), red temática CONACYT   
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