Iris is an open source Python library for analysing and visualising meteorological and oceanographic data sets, initially developed at the Met Office. Source code repository Documentation!forum/scitools-iris Users forum!forum/scitools-iris-dev Developers forum

Iris uses matplotlib for graphics and cartopy (also from the Met Office) for mapping (replacing basemap).


  • Reads/writes netCDF, UM PP and GRIB files
  • Reads UM fieldsfiles

Use on raijin

Iris 1.6 is installed on raijin under ~access/apps. To use it

module use ~access/modules
module load iris


Galley of example plots with links to scripts is here.


  • cartopy dependencies make installation awkward
  • Incomplete standard names and other metadata with fieldsfiles
  • Inconsistent merging of fields into multidimensional variables

Comparison with cdat

Note this refers to cdat 5 rather than the new UV-CDAT which I haven't really tried yet.

Last modified 4 years ago Last modified on Feb 3, 2015 4:36:45 PM