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{{#category_index:S|SLR}} 1. Satellite Laser Ranging; see laser ranging. 2. Side-Looking Radar, a remote-sensing method which involves sweeping the earth to either side of an aircraft with a radar beam and recording the reflected signals, which are displayed to give the appearance of an aerial photograph. An aircraft at 20 000 feet can map a strip about 12 miles wide. Also SLAR.