# Changes between Version 55 and Version 56 of udg/ecoms

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Timestamp:
Apr 1, 2013 5:24:06 AM (9 years ago)
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 v55 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. Although 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].