Hutt City 5m Contours

AAM NZ was engaged by Hutt City Council to undertake acquisition of Aerial Survey (LiDAR & imagery) for Orthophotos, LiDAR and vector generated products. LiDAR data was captured between the 23rd and 27th of March 2021. The vertical accuracy ≤10cm and positional accuracy for the Lidar dataset is ≤50cm (95% confidence in clear, open grounds). This dataset is supplied in NZTM, heights are in NZVD2016. Accuracy estimates for terrain modeling refer to the terrain definition on clear ground. Ground definition in vegetated terrain may contain localized areas with systematic errors or outliers which fall outside this accuracy estimate. The definition of the ground under trees may be less accurate due to fewer ground returns. Contours were generated using contour key points, which are a sub-set of the ground classified points. The key points are used to build a triangulated surface (TIN) from which the contours are generated. These are engineering contours designed to closely follow the TIN and provide an accurate representation of the terrain - especially in clear ground. The contours have “Elevations” and “Type” attributes. Types are INDEX or INTER (Intermediate) – every fifth contour is designated an INDEX contour. The 5m and 1m contours have been extracted from the 0.5m contour dataset. The data is supplied by AAM NZ Ltd. to Hutt City Council Under the terms of the Creative Commons 4.0 International License