The International working group on Polarized Radiative Transfer (IPRT) has been initiated in June 2011. Its objectives include:

• compare and improve polarized radiative transfer models
• provide benchmark results
• develop publically available codes
• provide information about free codes
• provide input data (scattering matrices, BPDFs)
• bring community together (workshops, …)

Phase B (3D test cases) of the model intercomparison has been published: Emde et al. 2018, JQSRT
The benchmark results can be downloaded here.

Results of phase A of the IPRT intercomparison have been published: Emde et al. 2015, JQSRT