D-CALM is a research aircraft used in the fields of optical remote sensing, oceanography, atmospheric and earth science research. A range of sensors may be installed, for example metric cameras, multi- and hyperspectral scanners, optoelectronic and infrared line scanners, microwave radiometers, synthetic aperture and side-looking airborne radar, scatterometers, LIDAR, etc. For further information see http://arsf.nerc.ac.uk/