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  • DennisHeimbigner · 5 ✖

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  • Better compression algorithms for NetCDF · 5 ✖

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  • NONE · 5 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
365479970 https://github.com/pydata/xarray/issues/1536#issuecomment-365479970 https://api.github.com/repos/pydata/xarray/issues/1536 MDEyOklzc3VlQ29tbWVudDM2NTQ3OTk3MA== DennisHeimbigner 905179 2018-02-14T02:55:22Z 2018-02-14T02:55:22Z NONE

The methods that need to be implemented are (in the C API) as follows:

int nc_def_var_filter(int ncid, int varid, unsigned int id, size_t nparams, const unsigned int* parms); The only tricky part is passing a vector of unsigned integers (the parms argument).

int nc_inq_var_filter(int ncid, int varid, unsigned int idp, size_t nparams, unsigned int* params); This requires passing values out via pointers. Also, this uses the standard netcdf-c trick in which the function is called twice. First with nparams defined, but params has the value NULL. This gives the caller the number of parameters. The function is called a second time after allocating the params vector and with that vector as the final argument.

 
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   Better compression algorithms for NetCDF 253476466
365476120 https://github.com/pydata/xarray/issues/1536#issuecomment-365476120 https://api.github.com/repos/pydata/xarray/issues/1536 MDEyOklzc3VlQ29tbWVudDM2NTQ3NjEyMA== DennisHeimbigner 905179 2018-02-14T02:30:05Z 2018-02-14T02:30:05Z NONE

The API is not yet exposed thru anything but the C api. So the python, fortran, and c++ wrappers do not yet show it. Passing it thru netcdf-python is probably pretty trivian, though.

 
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   Better compression algorithms for NetCDF 253476466
365475898 https://github.com/pydata/xarray/issues/1536#issuecomment-365475898 https://api.github.com/repos/pydata/xarray/issues/1536 MDEyOklzc3VlQ29tbWVudDM2NTQ3NTg5OA== DennisHeimbigner 905179 2018-02-14T02:28:42Z 2018-02-14T02:28:42Z NONE

A bit confusing, but I think the answer is yes. For example we provide a bzip2 compression plugin as an example (see examples/C/hdf5plugins in the netcdf-c distribution).

 
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   Better compression algorithms for NetCDF 253476466
365419155 https://github.com/pydata/xarray/issues/1536#issuecomment-365419155 https://api.github.com/repos/pydata/xarray/issues/1536 MDEyOklzc3VlQ29tbWVudDM2NTQxOTE1NQ== DennisHeimbigner 905179 2018-02-13T21:59:35Z 2018-02-13T21:59:35Z NONE

You may already know, but should note that the filter stuff in netcdf-c is now available in netcdf-c library version 4.6.0. So any filter plugin usable with hdf5 can now be used both for reading and writing thru the netcdf-c api.

 
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   Better compression algorithms for NetCDF 253476466
325775498 https://github.com/pydata/xarray/issues/1536#issuecomment-325775498 https://api.github.com/repos/pydata/xarray/issues/1536 MDEyOklzc3VlQ29tbWVudDMyNTc3NTQ5OA== DennisHeimbigner 905179 2017-08-29T19:35:55Z 2017-08-29T19:35:55Z NONE

The github branch filters.dmh for the netcdf-c library now exposes the HDF5 dynamic filter capability. This is documented here: https://github.com/Unidata/netcdf-c/blob/filters.dmh/docs/filters.md I welcome suggestions for improvements.

I also note that I am extending this branch to now handle szip compression. It turns out there is now a patent-free implementation called libaec (HT Rich Signell) so there is no reason not to make it available.

 
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   Better compression algorithms for NetCDF 253476466

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