Abstract: A static system designed for acquisition and processing of images of an area flown over in several spectral bands, which are variable on request, of the visible or infrared spectrum. The system includes an on-board assembly including a two-dimensional (distance.times.frequency) CCD matrix type photography device (1) suited for acquisition of successive images of strips of ground flown over in one or more spectral bands spread by a dispersion unit, and a processing unit (2) associated with a trajectory and trim determination device (3, 4), allowing selection in real time of images of the site in one or more spectral bands whose respective widths and spectral functions can be changed at will by means of software according to the nature of the phenomena to be analyzed within the scope of the application where it is used, and allowing ready linking up of images shifted by fluctuations of the aircraft trajectory, notably due to roll.

Abstract: The invention is a method and system for detecting, by means of specific processings of images of an area flown over taken in several spectral bands, signs indicative of a stress of the vegetation and the presence of spots where fire is likely to occur or spread. Images of the area flown over are acquired by means of a photography device (1) in a first spectral band selected in the red part (R) of the visible spectrum, in a second spectral band of the near infrared spectrum (N.I.R.) and in a third spectral band in the thermal infrared spectrum selected to locate parts of the area showing both a hydric stress and hot spots. Coded composite images are obtained by color coding of the aforementioned spectral bands and the images obtained in the three spectral bands are combined by means of a processing system (12, 13), which identifies fire development hazards caused by water deficit and local overheating. The system can be used for fire forecast, protection and fighting.