SFSI-2 - a new source of airborne hyperspectral SWIR imagery

摘要

Borstad Associates Ltd. has been flying the SFSI-2 (SWIR Full Spectrum Imager) operationally since August 1998 to provide a new source of remotely sensed Short Wave Infra Red imagery. SFSI-2 is a highly modified and updated instrument originally designed and constructed by the Canada Centre for Remote Sensing (CCRS). SFSI-2 operates in the Short Wave Infrared range, from 1230 nm to 2380 nm and after the Borstad modifications, it is smaller, requires less power, and has the ability to simultaneously acquire 230 spectral bands with 5 nm spacing. The instrument utilizes a two-dimensional detector array, refractive optics and a transmission grating with an angular field of view of 34 degrees. Continuous recording routinely produces image files of more than 20 km length. The instrument is small enough to fly in a single engine aircraft, and has often been flown with the Borstad Associates Ltd. casi (Compact Airborne Spectrographic Imager) to provide both VNIR and SWIR data. This paper presents examples of mapped data from the SFSI-2 over a hydrothermally altered target near Cuprite, Nevada in the western USA. It compares spectral signatures produced at altitude by the SFSI-2 with reflectance spectra acquired with ground instruments, and image maps from SFSI-2 with those produced from A VIRIS data.