# Stereoscopic spectroscopy

Stereoscopic spectroscopy is a special case of the more general field of tomographic spectroscopy. Both types of imaging use an analogy between the $(x,y,\lambda)$ data space of imaging spectrographs and the conventional $(x,y,z)$ 3-space of the physical world. Each spectral order in the instrument produces an image plane analogous to the view from a camera with a particular look angle through the $(x,y,\lambda)$ data space, and recombining the views allows recovery of (some aspects of) the spectrum at every location in the image.