A method of creating an orthomosaic of a corridor area consisting of a strip of land or water along an arbitrary path, which corridor area has a greater length than width, the width being not necessarily constant along the arbitrary path, the arbitrary path being partially describable by a corridor path polyline, the corridor path polyline being not straight, the method comprising: (a) flying an aircraft along a primary flight line, the primary flight line comprising a sequence of straight primary flight line segments, wherein the aircraft is flown level along each primary flight line segment, each primary flight line segment being unaligned with its immediate predecessor (if any) and not parallel to its immediate predecessor, each primary flight line segment approximating part of the corridor path polyline; (b) capturing, during flight along each primary flight line segment and via an aerial camera system carried by the aircraft, a sequence of primary images, each primary image at least partially overlapping its predecessor in the sequence; (c) flying the aircraft along a secondary flight line, the secondary flight line comprising a sequence of secondary flight line segments, each secondary flight line segment extending parallel to, and laterally offset from, a respective primary flight line segment; (d) capturing, during flight along each secondary flight line segment and via the aerial camera system carried by the aircraft, a sequence of secondary images, at least some of the secondary images overlapping at least some of the primary images; (e) identifying, in a plurality of the primary images and secondary images, common features corresponding to common ground points; (f) estimating, via bundle adjustment and from the common ground points, an exterior orientation associated with each primary image and a three-dimensional position associated with each ground point; (g) orthorectifying, using at least some of the exterior orientations and at least some of the three-dimensional ground point positions, at least some of the primary images; and (h) merging the orthorectified primary images to create the orthomosaic. (a) flying an aircraft along a primary flight line, the primary flight line comprising a sequence of straight primary flight line segments, wherein the aircraft is flown level along each primary flight line segment, each primary flight line segment being unaligned with its immediate predecessor (if any) and not parallel to its immediate predecessor, each primary flight line segment approximating part of the corridor path polyline; (b) capturing, during flight along each primary flight line segment and via an aerial camera system carried by the aircraft, a sequence of primary images, each primary image at least partially overlapping its predecessor in the sequence; (c) flying the aircraft along a secondary flight line, the secondary flight line comprising a sequence of secondary flight line segments, each secondary flight line segment extending parallel to, and laterally offset from, a respective primary flight line segment; (d) capturing, during flight along each secondary flight line segment and via the aerial camera system carried by the aircraft, a sequence of secondary images, at least some of the secondary images overlapping at least some of the primary images; (e) identifying, in a plurality of the primary images and secondary images, common features corresponding to common ground points; (f) estimating, via bundle adjustment and from the common ground points, an exterior orientation associated with each primary image and a three-dimensional position associated with each ground point; (g) orthorectifying, using at least some of the exterior orientations and at least some of the three-dimensional ground point positions, at least some of the primary images; and (h) merging the orthorectified primary images to create the orthomosaic.