North Auckland Digital Elevation Model (DEM) 0.5m 2024

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, 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 to cover the entire Auckland region in one seamless acquisition. 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. This DEM product is an upgraded, corrected, and improved version of the previous DEM published by Auckland Council on the Open Data portal. The other two parts covering the entire region are available at the following links: South Auckland and Waiheke 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 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）是对特定地形表面高程数据的数字化表达，属于三维表征形式，通常以栅格（raster）格式存储，每个栅格单元的数值即代表该位置的高程。该DEM表征的是裸土地形表面，即剔除了树木、建筑及其他各类地表附着物。 伍尔珀特（Woolpert）受奥克兰委员会（Auckland Council）委托，开展奥克兰区域外围的激光雷达（LiDAR）数据采集工作。本项目与2024年NIWE针对奥克兰中部开展的激光雷达采集项目保持一致，本质上是将该数据集扩展至整个奥克兰区域，实现无缝覆盖。 此外，区域软件控股有限公司（Regional Software Holdings Limited，简称RSHL）代表新西兰政府，委托伍尔珀特对包括奥克兰在内的多区域受风暴损毁区域开展航空激光雷达数据采集。本次DEM产品是奥克兰委员会此前在开放数据门户发布的旧版DEM的升级、校正与优化版本。覆盖全区域的另外两部分数据集可通过以下链接获取：南奥克兰与怀赫科岛数字高程模型（DEM）0.5米 2024、屏障群岛数字高程模型（DEM）0.5米。 两项测量工作均需满足高标准要求： • 垂直精度：≤20厘米（95%置信区间，CI） • 水平精度：≤100厘米（95%置信区间，CI） • 发射脉冲密度：8个脉冲每平方米（ppsm） • 地面分类：ICSM 2级 • 投影坐标系：NZTM2000 • 垂直基准面：NZVD2016 • 分幅方式：NZTopo50 1:1000分幅 • 分幅总数：18036幅 • 数据格式：GeoTIFF • 已进行水文平坦化处理 • 栅格分辨率：0.5米每单元 • 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： 奥克兰激光雷达测量报告（2024） | LINZ数据服务 奥克兰第二部分激光雷达测量报告2024 | LINZ数据服务 奥克兰激光雷达测量报告（2024） | LINZ数据服务 奥克兰第二部分激光雷达测量报告2024 | LINZ数据服务