PA-23
Piper PA-23

The Compact Airborne Spectrographic Imager (CASI) is an airborne push-broom imaging spectrometer developed by Itres Research Ltd. CASI measures reflectance in the visible/near-infrared (VNIR) spectral region, which can be used to derive vegetation characteristics. It operates in the 430-870 nm spectral range and has a 35-degree field of view (FOV). CASI has a cross-track ground resolution of 1.23 meters at 1 km altitude above ground level (AGL). The along-track resolution depends on the integration time and the aircraft speed. CASI has a frame rate of 85 lines per second.

The Fluorescence Line Imager (FLI) is an airborne passive imaging spectrometer developed for the Department of Fisheries and Oceans, Canada. It uses five charge-coupled device (CCD) array detectors to capture imagery across the visible and near-infrared spectrum (430-805 nm) over land and water. It has a spectral resolution of 2.5 nm and a spatial resolution of about 2 meters. FLI is typically employed to map chlorophyll, phytoplankton, leaf area index, and tree density.