# Changes between Version 7 and Version 8 of udg/ecoms/RPackage

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Timestamp:
May 22, 2013 1:25:08 PM (9 years ago)
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 v7 == Overview of the R package under development == = Overview of the R package under development == Vocabulary definition == == Vocabulary definition In order to set a common framework with a precise definition of the variables, the R package is based on the use of a vocabulary. Essentially, the vocabulary is simply a table containing the standard names of a number of variables commonly used in impact studies and downscaling applications. The naming conventions and the units are based on the standard name table provided by the [http://cf-pcmdi.llnl.gov/documents/cf-standard-names/standard-name-table/16/cf-standard-name-table.html/ NetCDF Climate and Forecast Metadata Convention]. The vocabulary consists of a table with: == Dictionary == == Dictionary The dictionary is a table whose aim is twofold: * short_name: this is the name with which the original variable has been coded in the dataset * time_step: the time interval between consecutive times in the time dimension axis (in hours) * lower_time_bound: lower time bound of the variable * upper_time_bound: upper time bound of the variable. For instance, if a variable has identical lower and upper time bounds, it means that it is instantaneous. * lower_time_bound: lower time bound of the variable. This should be in hours. * upper_time_bound: upper time bound of the variable. This should be in hours. For instance, if a variable has identical lower and upper time bounds, it means that it is instantaneous. * aggr_fun: time aggregation function. Type of aggregation function applied to the variable between the lower and upper time bound. * offset: constant summed to the original variable for units conversion (e.g.: offset = -273.15 for conversion from Kelvin to Celsius)