Extract metadata from 'NetCDF' data sources, these can be files, file handles or servers. This package leverages and extends the lower level functions of the 'RNetCDF' package providing a consistent set of functions that all return data frames. We introduce named concepts of 'grid', 'axis' and 'source' which are all meaningful entities without formal definition in the 'NetCDF' library https://www.unidata.ucar.edu/software/netcdf/. 'RNetCDF' matches the library itself with only the named concepts of 'variables', 'dimensions' and 'attributes'.
ncmeta provides a consistent set of tools to obtain metadata from NetCDF. NetCDF
is 'Network Common Data Form' https://www.unidata.ucar.edu/software/netcdf/.
These functions are generics, allowing methods to be written for various providers so that
everything can work from a common basis. All functions return a data frame.
Maintainer: Michael Sumner mdsumner@gmail.com
Other contributors:
Tomas Remenyi [contributor]
Ben Raymond [contributor]
David Blodgett [contributor]
Milton Woods [contributor]
Each function responds to a character file name or data source (i.e. URL) or to a connection of a given class, this is so a source connection may be created a minimal number of times and kept open while a number of entities are queried.
Each "given" entity may be referred to by index (0-based) or name, just as it would be by the NetCDF
API and by the two R wrapper providers RNetCDF and ncdf4.
nc_att | find the given attribute of a given variable |
nc_atts | find all attributes, of all variables and globals |
nc_axes | find all the instances of dimensions |
nc_axis | find given instance of a dimension (1-based) |
nc_dim | find the given dimension of a source (0-based) |
nc_dims | find all the dimensions of a source |
nc_grids | find the grids (sets of dimensions) of a source |
nc_inq | inquire about a source (i.e. number of dimensions, number of variables, number of global attributes and presence of unlimited dimension |
nc_meta | find all metadata for a source (runs all other functions) |
nc_sources | tags a record of a source and its "access time" |
nc_var | find a given variable (0-based) |
nc_vars | find the variables of a source |
Useful links: