# Changes between Version 8 and Version 9 of EcomsUdg/RPackage/Functions

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Timestamp:
Apr 29, 2013 6:47:22 PM (9 years ago)
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 v8 '''__1. ncmlAggreg.R__''' A NcML file is a [http://en.wikipedia.org/wiki/XML XML representation] of netCDF metadata. This is approximately the same information one gets when dumping the header of a netCDF file (e.g. by typing on the terminal the command ncdump -h). By means of NcML it is possible to create virtual datasets by modifying and [http://www.unidata.ucar.edu/software/netcdf/ncml/v2.2/Aggregation.html aggregating] other datasets, thus providing maximum flexibility and ease of access to data stored in collections of files containing data from different variables/time slices, as far as all data are queried from a single NcML representation of the dataset. NcML files are the basis on which the different R functions here described are based on. A NcML file is a [http://en.wikipedia.org/wiki/XML XML representation] of netCDF metadata. This is approximately the same information one gets when dumping the header of a netCDF file (e.g. by typing on the terminal the command ncdump -h). By means of NcML it is possible to create virtual datasets by modifying and [http://www.unidata.ucar.edu/software/netcdf/ncml/v2.2/Aggregation.html aggregating] other datasets, thus providing maximum flexibility and ease of access to data stored in collections of files containing data from different variables/time slices, as far as all data are queried from a single NcML representation of the dataset. The function is intended to deal with reanalysis, forecasts and other climate data products, often consisting of collections of netCDF files corresponding to different variables and partitioned by years/decades or other time slices. NcML files are the basis on which the different R functions here described are based on. The ncmlAggreg.R function generates a NcML file from a collection of netCDF or GRIB files stored in a common directory. The function is called as follows: The output is a NcML file named as file.name which will be stored in the output.dir. ''__Details__:'' * All files of the same dataset should be put together in the same directory, indicated by the source.dir argument. * Currently the function has been only tested for netCDF (.nc) files, although GRIB files will be included in next versions. * Note that the output.dir should be writable in order to create the ncml file. * A number of useful recommendations regarding dataset naming are provided [http://www.unidata.ucar.edu/software/netcdf-java/reference/DatasetUrls.html#NcmlScan here] '''__2. dataInventory.R__'''