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ncdfCF 0.2.1

ncdfCF 0.2.0

• NetCDF groups are now fully supported, including traversing group hierarchies with absolute or relative paths.
• All axis types are identified correctly. This includes:
  • Regular coordinate axes (a.k.a. NUG coordinate variables).
  • Discrete axes, even when no coordinate variable is present - an extension to the CF conventions.
  • Parametric vertical axes, but values are not yet computed.
  • Scalar axes, linked to variables through the “coordinates” attribute of the latter.
  • Auxiliary longitude-latitude grids, the horizontal component of the grid of a variable that was not defined as a Cartesian product of latitude and longitude, using the “coordinates” attribute of the variable. When subsetting a data variable, resampling is automatically performed.
  • The four axes that “receive special treatment” by the Conventions each have a separate class to deal with their specific nature: CFAxisLongitude, CFAxisLatitude, CFAxisVertical, and CFAxisTime.
• Bounds are read and interpreted on all axes except the vertical axis, including any auxiliary long-lat grids.
• Information on UDTs is captured in a separate class. This is effectively only supported for the “compound” sub-type, for scalar values only.
• Data is read into the most compact form possible. This saves a significant amount of memory when large integer variables are read as they would remain integers rather than the default numeric type.
• Data is returned from CFVariable$subset() as an instance of the CFData class, with associated objects such as axes and the attributes from the variable. Data can be read out in a variety of forms, currently as a raw array, an oriented array or as a terra::SpatRaster or terra::SpatRasterDataset.
• Full support for grid mapping variables. As a significant extension over CF Metadata requirements, CRS strings are produced in the OGC WKT2 format, using the latest EPSG database of geodetic objects.
• Improvements in printing object details.
• Code refactored to R6.
• GHA enabled

ncdfCF 0.1.1

• objects_by_standard_name() will list objects in the netCDF resource that have a “standard_name” attribute.

ncdfCF 0.1.0

• Initial CRAN submission. This is a WORK IN PROGRESS and the package is not yet fit for a production environment.
• This version supports reading from netCDF resources. CF Metadata Conventions are used to set properties on axis orientation, time dimensions and bounds.
• Standard R commands can be used to inspect properties of the netCDF resource, such as dimnames() and length().
• Access to data uses the R standard [ selection operator for use with dimension indices. Use real-world coordinates with subset().

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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