Imaging apparatus with a plurality of detection units arranged in a focal plane

The apparatus has an optical pickup unit (100) adapted to form an image in a focal plane (PF). A parallel main detector detects unidirectional-type lines (L) of photosensitive elements juxtaposed in a direction line (DL). The lines are offset in a column direction (DC). The main detector includes a transfer line (TL) from main direction to unidirectional parallel column direction. Substrates of two detector assemblies (10) are arranged in the focal plane of the columns such that an edge of the main detector is located on edges of sensors oriented on a same side of the focal plane. An independent claim is also included for a method for realizing an imaging apparatus in an on-board of a satellite or an aircraft.