Christchurch 0.075m Urban Aerial Photos (2018-2019)

Christchurch 0.075m Urban Aerial Photos (2018-2019)

Toitū Te Whenua Land Information New Zealand

2019

Orthophotography for urban areas across Christchurch City totalling approximately 524 km2. Taken in the flying season (summer period) 2018-19. The area of capture is located in the Canterbury Region of the South Island.

Imagery was captured for Environmental Canterbury by Aerial Surveys Ltd, Unit A1, 8 Saturn Place, Albany,0632, New Zealand.

Data comprises:
• 7984 ortho-rectified RGB GeoTIFF images in NZTM projection, tiled into the LINZ Standard 1:500 tile layout
•Tile layout in NZTM projection containing relevant information.

The supplied imagery is in terms of New Zealand Transverse Mercator (NZTM) map projection. Please refer to the supplied tile layout for specific details, naming conventions, etc.

Imagery supplied as 7.5 cm pixel resolution (0.075m GSD), 3-band (RGB) uncompressed GeoTIFF. The final spatial accuracy is ±0.15 m @ 95% confidence level.

Index tiles for this dataset are available as layer [Christchurch 0.075m Urban Aerial Photos Index Tiles (2018-2019)](http://data.linz.govt.nz/layer/105045)

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.

-43.68229409757102 172.37701803893498 -43.377676574794755 172.83644869803308

https://data.linz.govt.nz/layer/105041-christchurch-0075m-urban-aerial-photos-2018-2019/

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