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Summary form only given. Backscatter absorption gas imaging (BAGI) is a remote sensing technique that uses active imaging to generate real-time video images of chemical vapor plumes. As such, BAGI represents a fusion between absorptive chemical detection LIDAR and imaging laser radar. Plume imaging occurs when a gas that can absorb light at the laser wavelength enters the system field-of-view, thereby attenuating the scene backscatter and causing a cloud image.