The aerial photography for this project was captured within the 2021/22 flying season (September 2021 – April 2022).
Camera and Flying Height All photography was captured using Vexcel's digital UCE camera fitted with the 100 mm lens and flown at an altitude of approximately 4,773 ft (1,454 m) with the lowest ground GSD set at 0.075 m.
Capture Dates The aerial imagery was captured on the following dates: 15-16 January 2022.
Sun Angle Imagery captured with a minimum sun angle of +35 degrees. The sun angle of the imagery used for the orthorectification ranged from 38.5 to 68.3 degrees.
Flight Planning The flight survey number for this project is SN14226 The flight plan is named ‘Nelson Urban 21-24 7-5cm UCE’ and comprises 57 runs, 2,718 frames. All imagery captured in stereo: 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. Tidal areas captured -/+ 1.5 hours either side of low tide.
Urban Building Displacement Specification Urban 0.075 m GSD imagery – using the UCE camera and by flying with 60% forward overlap and with 35% sidelap (standard stereo coverage) will achieve ~1 m building lean per 3 m height in the corners of the imagery used. Tall structures inwards of the corner of the frame will have less lean the closer to the nadir they are.
Ground Control A combination of existing control and LINZ benchmarks were used for aerial triangulation for this project