South Auckland and Waiheke Digital Elevation Model (DEM) 0.5m 2024

A Digital Elevation Model (DEM) is a digital representation of the elevation data for a given topographic surface. It is a 3D representation, typically in the form of a raster (a grid of regularly spaced squares or pixels), where each cell holds a value representing the elevation at that point. The DEM is a representation of the bare-earth topographic surface, meaning it excludes trees, buildings, and any other surface objects. Woolpert was contracted by Auckland Council to collect LiDAR data over the outer parts of the Auckland Region. This project was designed to be consistent with the 2024 NIWE LiDAR capture over central Auckland, essentially extending that data set. Separately, Regional Software Holdings Limited (RSHL), on behalf of the New Zealand Government, hired Woolpert to capture aerial LiDAR over storm-damaged areas in multiple regions, including Auckland. The other two parts covering the entire region are available at the following links: North Auckland Digital Elevation Model (DEM) 0.5m 2024 Barrier Islands Digital Elevation Model (DEM) 0.5m Both surveys were required to meet high-quality standards: • Vertical Accuracy: ≤20cm (95% CI) • Horizontal Accuracy: ≤100cm (95% CI) • Emitted Pulse Density: 8ppsm • Ground Classification: ICSM level 2 • Projection: NZTM2000 • Vertical datum: NZVD2016 • Tiling: NZTopo50 1:1000 tiles • Number of tiles: 18,036 • Format: GeoTIFF • Hydro-flattened • Resolution: 0.5m cell • Ancillary files in ESRI Shapefile format • Metadata: You can access the detailed project reports at the following links Auckland LiDAR Survey Report (2024) | LINZ Data Service Auckland Part 2 LiDAR Survey Report 2024 | LINZ Data Service数字高程模型（Digital Elevation Model, DEM）是对指定地形表面高程数据的数字化表达。它属于三维表达形式，通常以栅格（由规则排布的方格或像素构成的网格）形式呈现，每个栅格单元存储对应位置的高程数值。DEM所表征的是裸土地形表面，即剔除了树木、建筑物及其他各类地表附着物的地表形态。 伍珀特（Woolpert）受奥克兰议会委托，负责采集奥克兰大区外围区域的激光雷达（LiDAR）数据。本项目与2024年NIWE激光雷达扫描覆盖奥克兰中部的项目标准保持一致，本质上是对该数据集的延伸覆盖。 另有一项独立项目：区域软件控股有限公司（Regional Software Holdings Limited, RSHL）代表新西兰政府，委托伍珀特对包括奥克兰在内的多个受风暴损毁区域开展航空激光雷达数据采集工作。 覆盖整个大区的另外两部分数据集可通过以下链接获取： 1. 北奥克兰数字高程模型（DEM）0.5米 2024 2. 屏障群岛数字高程模型（DEM）0.5米 两项勘测工作均需满足以下高质量标准： • 垂直精度：≤20厘米（95%置信区间（Confidence Interval, CI）） • 水平精度：≤100厘米（95%置信区间（Confidence Interval, CI）） • 发射脉冲密度：8ppsm • 地面分类等级：ICSM 2级 • 投影坐标系：NZTM2000 • 垂直基准面：NZVD2016 • 分幅规则：采用NZTopo50 1:1000比例尺分幅 • 总幅数：18036幅 • 数据格式：GeoTIFF • 已完成水文平整处理 • 栅格分辨率：0.5米/单元 • 辅助文件格式：ESRI Shapefile • 元数据：可通过以下链接获取详细项目报告： 奥克兰激光雷达勘测报告（2024） | LINZ数据服务 奥克兰第二部分激光雷达勘测报告2024 | LINZ数据服务