Changes between Version 8 and Version 9 of udg/ecoms/dataserver/interfaces


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Timestamp:
Feb 24, 2016 2:35:28 PM (6 years ago)
Author:
antonio
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  • udg/ecoms/dataserver/interfaces

    v8 v9  
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     12= Low-leves interface to OpenDAP service =
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    15 {{{#!comment
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    1716Although the `TDS` provides a web interface to explore and access the datasets (shown in [#s.web.access web access section]), it is strongly recommented the use of `OPeNDAP` (a.k.a. `DODS`) client libraries to remotely access the data from scientific computing environments (`R`, `Matlab`, `Python`, etc.). For instance, the `R` function provided in this tutorial is based on the ''NetCDF Java'' OPeNDAP client[[FootNote(http://www.unidata.ucar.edu/software/netcdf-java/documentation.htm)]], using the `rJava` `R` package (a similar approach is been also made for the `Matlab` implementation). Alternatively, the most recent ''NetCDF library'' versions provide access to `OPeNDAP` datasets (this is the solution for the `Python` implementation). In the following, we show a simple example of data access using the `R` package developed as part of the data portal. In particular the ''System4'' datasets can by directly accessed using the `loadSystem4` function, allowing the retrieval of slices for a particular variable in any of the dataset dimensions (`member`/space/`runtime`/`time`). Note that a more ellaborated worked example using `R` is shown in the [#Appendix.rexample R example section].  Moreover, for a better understanding of the datasets structure, the use of the web interface for the `OPeNDAP`  service is also illustrated [#s.web.access web access section].
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    20 = Accessing to the Data portal using Python (Pydap version) = #ex.pydap
     19== Accessing to the Data portal using Python (Pydap version) == #ex.pydap
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    2221[[NoteBox(warn,This section **still** needs revision)]]
     
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    63 = Accessing to the Data portal using Octave = #ex.octave
     62== Accessing to the Data portal using Octave == #ex.octave
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    6564[[NoteBox(warn,This section needs revision and integrtion with the [#ex.matlab Matlab example section])]]
     
    143142[[FootNote]]
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    145 }}}