The SWIR full spectrum imager is an imaging spectrometer covering the short-wave infrared from 1220 to 2420 nm, which has been developed for remote sensing from an airborne platform. The sensor has been designed to acquire the full spectrum at high spectral resolution and the full image swath at high spatial resolution simultaneously. The instrument utilizes a 2D detector array, refractive optics and a transmission grating. The fore-optics and spectrograph are f/1.8, and the angular field-of-view is 9.4 degrees. The detector is a 488 line by 512 pixel PtSi Schottky barrier photodiode array. A VME bus computer communicates with the array controller, performs the data acquisition and provides the operator interface. The optical design and sensor system are described: calibration methods and results are presented. Post flight data processing procedures are described and the spectral signal-to-noise ratio is calculated from in-flight data. A sample single-band image from data collected on the JUne 1995 Nevada mission is displayed, spectra of minerals and trees are extracted, and a classification of this image is shown.