  Liger is a second generation near-infrared imager and integral field
spectrograph (IFS) for the W. M. Keck Observatory that will utilize the
capabilities of the Keck All-sky Precision Adaptive-optics (KAPA) system. Liger
operates at a wavelength range of 0.81 {\mu}m - 2.45 {\mu}m and utilizes a
slicer and a lenslet array IFS with varying spatial plate scales and fields of
view resulting in hundreds of modes available to the astronomer. Because of the
high level of complexity in the raw data formats for the slicer and lenslet IFS
modes, Liger must be designed in conjunction with a Data Reduction System (DRS)
which will reduce data from the instrument in real-time and deliver
science-ready data products to the observer. The DRS will reduce raw imager and
IFS frames from the readout system and provide 2D and 3D data products via
custom quick-look visualization tools suited to the presentation of IFS data.
The DRS will provide the reduced data to the Keck Observatory Archive (KOA) and
will be available to astronomers for offline post-processing of observer data.
We present an initial design for the DRS and define the interfaces between
observatory and instrument software systems.
