Christchurch 0.075m Urban Aerial Photos (2018-2019)

Project
Aerial photography was captured over the urban areas in the Christchurch City totalling approximately 524 km2. The areas of capture are located in the Canterbury Region of the South Island.

Data Acquisition
Aerial photography was captured using Vexcel's digital UCE camera: 5-6 November, 2018, 17 December 2018, 24 December 2018, 27 January 2019, 9 February 2019, 26
March 2019.

Ground Support
New/existing control and LINZ benchmarks were used for aerial triangulation.

Camera
All photography was captured using Vexcel's digital UCE camera and flown at:
0.075 m GSD: 4,732 ft (1,441 m) flying height
Camera Lens: 100 mm

Sun Angle
Imagery captured with a sun angle between 43.8 and 69.1 degrees

Flight Planning
SN14003 Selwyn: 65 runs, 1,058 frames
SN14008 Waimate: 19 runs, 247 frames
SN14009 Christchurch: 44 runs, 2,273 frames
SN14010 Banks Peninsula: 24 runs, 459 frames
Stereo capture: Forward overlap 60%, min 54%. Side overlap 35%, min 15%.

Environmental Specification
Imagery captured with no cloud or cloud shadow within the area of interest. Coastal and harbour
areas captured within two hours either side of low tide.

Urban Building Displacement Specification
Urban 0.075 m GSD imagery – by flying with 60% forward overlap and with 35% sidelap (standard
stereo coverage), 1 m building lean per 3 m height in the corners of the imagery. Christchurch CBD and University of Canterbury areas flown with 80% forward with 80% sidelap to achieve <0.37 m per 3 m height over areas with tall buildings.