ESA Acquisition Methods Dictionary urn:ogc:def:dictionary:CEOS:eop:AcquisitionMethods:v01 Uses a fixed linear array of detectors which is swept across an area by the motion of the platform, thereby building up an image. One scanning dimension is thus provided by the array of detectors while the other dimension is provided by the platform motion. Also called Along-Track. Pushbroom Along-Track Uses an oscillating mirror that sweeps across the scene (and eventually down the ground track for slow moving platforms) in a series of adjacent lines. Each line is subdivided into pixels, and the image is built up by adding pixels continuously. Also called Across track. Whiskbroom Across-Track Uses a uniformly rotating mirror or antenna that generates look rays in a conical pattern relative to the target body. Data is acquired during a portion of the mirror revolution leading to curvilinear scan lines. Conical Uses photography film or a 2 dimensional detector array to acquire a 2D snapshot of a scene. No mechanical motion is necessary to obtain the pixels since a full picture is taken at once. Frame Camera