Top of the South 0.15m Flood Aerial Photos Index Tiles (2022)

Top of the South 0.15m Flood Aerial Photos Index Tiles (2022)

Toitū Te Whenua Land Information New Zealand

2022

Index Tiles ONLY, for actual orthophotos see layer [Top of the South 0.15m Flood Aerial Photos (2022)](http://data.linz.govt.nz/layer/110821)

A record of the Top of the South Island severe weather emergency event August 2022.

Orthophotography within the Tasman, Nelson City and Marlborough District totaling approximately 918km². Captured between the 23rd August 2022 and 6th September 2022. Coverage includes Nelson to Brightwater, including the Waimea River, State Highway 6 from Hira to Rai Valley and Ōkiwi Bay access road, plus Abel Tasman Drive, Bird Hill and Takaka Hill in Golden Bay.

Imagery was captured for Nelson City Council, Tasman District Council and Waka Kotahi by Aerial Surveys Ltd, Unit A1, 8 Saturn Place, Albany 0632, New Zealand.

Data comprises:
• 2658 ortho-rectified RGB GeoTIFF images in NZTM projection, tiled into the LINZ Standard 1:1000 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 tile index layer for specific details, naming conventions, etc.

Imagery supplied as 15cm pixel resolution (0.15 m GSD), 3-band (RGB) uncompressed GeoTIFF. The final spatial accuracy is ±0.5 at 95% confidence level in clear flat areas.

Project
Aerial Surveys Ltd was engaged by Nelson City Council, Tasman District Council and Waka Kotahi to acquire Lidar and Aerial Photos in response to the Top of the South Island severe weather emergency event August 2022.

Camera and Flying Height
All photography was captured using Optech's digital PhaseOne camera fitted with the 50 mm lens and flown at an altitude of approximately 6,397 ft (1,950 m) with the lowest ground GSD set at 0.15 m.

Capture Dates
The aerial imagery was captured on the following date:
23 August 2022 to 6 September 2022.

Sun Angle
The sun angle of the imagery used for the orthorectification ranged from 24.1 to 36.9 degrees.

Flight Planning
The flight survey number for this project is SN14266. All imagery captured in stereo: minimum forward overlap 60%; side overlap 30%.

Environmental Specification
Imagery captured with minimal cloud. Cloud areas that impact LiDAR point density or specific sites of detail have been re-flown. An attempt was made to capture tidal areas at or near low tide.

Ground Control
A combination of existing control and LINZ benchmarks were used for aerial triangulation for this project.

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