Operational Land Image
|Within Vocab||SeaVoX Device Catalogue|
|Definition||The Operational Land Imager (OLI) is a high resolution optical imager designed for land and vegetation observation. It measures in the visible, near-infrared, and short-wave infrared spectrums over nine spectral bands. The OLI uses long detector arrays (of over 7000 detectors per spectral band) aligned across its focal plane to view across the swath. A four-mirror anastigmatic telescope focuses incident radiation onto the focal plane while providing a 15 degree field of view (FOV). Periodic sampling of the cross-track detectors as the observatory progresses along a ground track forms the multispectral digital images. The detectors are divided into 14 modules arranged in an alternating pattern along the centreline of the focal plane. The spectral differentiation is achieved by interference filters arranged in a butcher-block pattern over the detector arrays in each module. Silicon PIN (SiPIN) detectors collect the data for the visible and near-infrared spectral bands (bands 1 to 4 and 8) while Mercury-Cadmium-Telluride (MgCdTe) detectors are used for the shortwave infrared bands (bands 6, 7, and 9). The OLI has a swath width of 185 km and produces images with a 30 m multi-spectral spatial resolution. The wavelengths of the nine spectral bands are 0.433-0.453 micrometres, 0.450-0.515 micrometres, 0.525-0.600 micrometres, 0.630-0.680 micrometres, 0.845-0.885 micrometres, 1.560-1.660 micrometres, 2.100-2.300 micrometres, 0.500-0.680 micrometres and 1.360-1.390 micrometres. The OLI produced data calibrated to an uncertainty of less than 5 percent in terms of absolute, at-aperture spectral radiance and to an uncertainty of less than 3 percent in terms of top-of-atmosphere spectral reflectance for each of the spectral bands. Flown on Landsat. http://www.wmo-sat.info/oscar/instruments/view/375|
|Has Current Version||3|
|Version||1 , 2|
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