Changes between Version 17 and Version 18 of udg/ecoms


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Timestamp:
Mar 13, 2013 7:49:52 PM (9 years ago)
Author:
antonio
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  • udg/ecoms

    v17 v18  
    4141* '''System4 annual range (15 members)''': As in the previous case, there are four `runtimes` per year, but the forecasts run for 13 months. An ensemble of 15 members is available for the whole 1981-2010 period.
    4242
    43 Data gathering activities will next move to the CFS (http://cfs.ncep.noaa.gov) version 2 hindcast, developed at the '''Environmental Modeling Center at NCEP''' and also to reanalysis and observational datasets.
     43Data gathering activities will next move to the CFS (http://cfs.ncep.noaa.gov) version 2 hindcast, developed at the ''Environmental Modeling Center at NCEP'' and also to reanalysis and observational datasets.
    4444
    4545Although 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 (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].