---
name: "nctoh5"
section: "1"
platform: "linux"
package: "python3-tables"
version: "3.4.4-2"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/nctoh5"
---

# nctoh5(1)

Convert a NetCDF file into a PyTables (HDF5 format) file

## NAME

nctoh5 - Convert a NetCDF file into a PyTables (HDF5 format) file

## SYNOPSIS

**nctoh5** -h -v -o --complevel=(0-9) --complib=lib --shuffle=(0\|1) --fletcher32=(0\|1) --unpackshort=(0\|1) --quantize=(0\|1) netcdffilename hdf5filename\

## DESCRIPTION

Convert a generic NetCDF file into a PyTables (HDF5 format) file

## OPTIONS

A summary of options is included below.

- **-h**

  Prints a help text.

- **-v**

  Show more information.

- **-o**

  Overwrite destination file.

- **--complevel=(0-9)**

  Sets a compression level (0 for no compression, which is the default).

- **--complib=lib**

  Sets the compression library to be used during the copy. *lib* can be set to "zlib", "lzo" or "ucl". Defaults to "zlib".

- **--shuffle=(0\|1)**

  Activate or not the shuffling filter (default is active if complevel\>0).

- **--fletcher32=(0\|1)**

  Whether activate or not the fletcher32 filter (not active by default).

- **--unpackshort=(0\|1)**

  Unpack short integer variables to float variables using scale\_factor and add\_offset netCDF variable attributes (not active by default).

- **--quantize=(0\|1)**

  Quantize data to improve compression using least\_significant\_digit netCDF variable attribute (not active by default).  See\
   http://www.cdc.noaa.gov/cdc/conventions/cdc\_netcdf\_standard.shtml\
   for further explanation of what this attribute means.

## SEE ALSO

[**ptdump**(1)](/ptdump/1.md),[**ptrepack**(1)](/ptrepack/1.md).\
 These utilities are documented fully by *PyTables user's manual*.

## AUTHOR

This manual page was written by Francesc Altet \<faltet@carabos.com\>.