hohonuuli
commented
7 years ago Is there a way to read 10 variables from one source file remotely from an OPeNDAP server with a single server access using nctoolbox ?
Here’s a code snippet that reads the last 10 variables of your file into a Matlab structure.
ds = ncgeodataset(f); v = ds.variables; n = length(v); for i = n:-1:n - 10 varname = v{i}; m.(varname) = ds.data(varname); end m
Brian Schlining
On September 15, 2016 at 6:16:38 AM, marius (notifications@github.com) wrote:
Hello,
We currently use nctoolbox to read and store meteorological grib2 data remotely from the CFSR database using MATLAB.
The following filepath is an example OPeNDAP database accessed by nctoolbox
"filepath = http://nomads.ncdc.noaa.gov/thredds/dodsC/modeldata/cmd_pgbh/2006/200604/20060404/pgbh05.gdas.2006040418.grb2; "
The source grib2 file is stored in a ncgeodataset object.
"ds=ncgeodataset(filepath);"
The variable of choice is retrived using a in a geovariable .
"CFSR_variablename = 'Temperature_height_above_ground'; %air temperature in 2 m height variable = ds.geovariable(CFSR_variablename);"
Currently, nctoolbox, recursively, calls files which contains values of a lot of parameters. Amongst these parameters are ~10 required parameters for each file = point of time. This is done to download a time history of the required parameters.
Up to now, I have to access the same file containing 10 required parameters for the same time, 10 times. Once for each parameter. This is because I don't see a way to use "ds.geovariable" for more than one variable. E.g. "[variable1,variable2] = ds.geovariable(Temperature_surface,Pressure_surface)"
The multiple accesses make my script quite slow. Therefore, I would like to access one file and retrieve all required parameters all at once.
Is there a way to read 10 variables from one source file remotely from an OPeNDAP server with a single server access using nctoolbox ? I did not find an example in the documentation but I did not find it denied either.
Thank you and best regards Marius
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mariuskist
Hello,
We currently use nctoolbox to read and store meteorological grib2 data remotely from the CFSR database using MATLAB.
The following filepath is an example OPeNDAP database accessed by nctoolbox
"filepath = http://nomads.ncdc.noaa.gov/thredds/dodsC/modeldata/cmd_pgbh/2006/200604/20060404/pgbh05.gdas.2006040418.grb2;"
The source grib2 file is stored in a ncgeodataset object.
"ds=ncgeodataset(filepath);"
The variable of choice is retrived using a in a geovariable .
"CFSR_variablename = 'Temperature_height_above_ground'; %air temperature in 2 m height variable = ds.geovariable(CFSR_variablename);"
Currently, nctoolbox, recursively, calls files which contains values of a lot of parameters. Amongst these parameters are ~10 required parameters for each file = point of time. This is done to download a time history of the required parameters.
Up to now, I have to access the same file containing 10 required parameters for the same time, 10 times. Once for each parameter. This is because I don't see a way to use "ds.geovariable" for more than one variable. E.g. "[variable1,variable2] = ds.geovariable(Temperature_surface,Pressure_surface)"
The multiple accesses make my script quite slow. Therefore, I would like to access one file and retrieve all required parameters all at once.
Is there a way to read 10 variables from one source file remotely from an OPeNDAP server with a single server access using nctoolbox ? I did not find an example in the documentation but I did not find it denied either.
Thank you and best regards Marius