A spectral camera control device, adapted to be installed with a spectral camera comprising a liquid crystal tunable filter, in an aircraft capable of stationary flight, the aircraft comprising means for detecting the position and attitude, wherein the spectral camera control device is adapted to cause the spectral camera to capture an image in a snapshot mode each time a transmission wavelength of the liquid crystal tunable filter is switched while the aircraft is in stationary flight, and the spectral camera control device comprises storage means containing a threshold storage section, storing thereon predetermined thresholds, including a saturation limit value and thresholds based on the spatial resolution of the spectral camera, such as angular velocity thresholds, wherein the spectral camera control device is adapted to initially set an optimal exposure time of the spectral camera by making the spectral camera capture a spectral image at a initially set exposure time to acquire a maximum pixel value and discriminate whether or not the maximum pixel value is less than the saturation limit value stored in the storage means, if the maximum pixel value is less than the saturation limit value setting the exposure time as the optimal exposure time or decrease the initially set exposure time until the maximum pixel value is less than the saturation limit value setting this value as the optimal exposure time, and wherein the spectral camera control device comprises an attitude position information acquisition section which functions to acquire an amount of attitude change or an amount of positional change of the spectral camera based on the means for detecting the position and attitude, and wherein the spectral camera control device is adapted to monitor the change in attitude and position of the spectral camera and adapted to set an exposure time of the spectral camera to a shorter time than a current exposure time when either one of an amount of attitude change and an amount of position change of the spectral camera per exposure time in the spectral camera exceeds a predetermined threshold based on a spatial resolution of the spectral camera. wherein the spectral camera control device is adapted to cause the spectral camera to capture an image in a snapshot mode each time a transmission wavelength of the liquid crystal tunable filter is switched while the aircraft is in stationary flight, and the spectral camera control device comprises storage means containing a threshold storage section, storing thereon predetermined thresholds, including a saturation limit value and thresholds based on the spatial resolution of the spectral camera, such as angular velocity thresholds, wherein the spectral camera control device is adapted to initially set an optimal exposure time of the spectral camera by making the spectral camera capture a spectral image at a initially set exposure time to acquire a maximum pixel value and discriminate whether or not the maximum pixel value is less than the saturation limit value stored in the storage means, if the maximum pixel value is less than the saturation limit value setting the exposure time as the optimal exposure time or decrease the initially set exposure time until the maximum pixel value is less than the saturation limit value setting this value as the optimal exposure time, and wherein the spectral camera control device comprises an attitude position information acquisition section which functions to acquire an amount of attitude change or an amount of positional change of the spectral camera based on the means for detecting the position and attitude, and wherein the spectral camera control device is adapted to monitor the change in attitude and position of the spectral camera and adapted to set an exposure time of the spectral camera to a shorter time than a current exposure time when either one of an amount of attitude change and an amount of position change of the spectral camera per exposure time in the spectral camera exceeds a predetermined threshold based on a spatial resolution of the spectral camera.