Barrier Islands Digital Elevation Model (DEM) 0.5m

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, 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: North Auckland Digital Elevation Model (DEM) 0.5m 2024 South Auckland and Waiheke Digital Elevation Model (DEM) 0.5m 2024 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，每个栅格单元存储对应点位的高程数值。该DEM仅表达裸地地形表面，即剔除了树木、建筑物及其他地表附着物。 Woolpert受奥克兰议会（Auckland Council）委托，采集奥克兰大区外围区域的激光雷达（LiDAR）数据。本项目旨在与2024年针对奥克兰中部的NIWE激光雷达采集项目保持标准统一，本质上是将该数据集扩展至全覆盖奥克兰大区的无缝采集作业。 此外，区域软件控股有限公司（Regional Software Holdings Limited, RSHL）代表新西兰政府，委托Woolpert对包括奥克兰在内的多个受风暴损毁区域开展机载激光雷达采集作业。 本DEM产品是奥克兰议会此前在开放数据门户发布的前代DEM的升级、校正与优化版本。覆盖全区域的另外两个数据集可通过以下链接获取： • 北奥克兰2024年0.5米分辨率数字高程模型（DEM） • 南奥克兰与怀希基2024年0.5米分辨率数字高程模型（DEM） 两项测绘作业均需满足以下高标准要求： • 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（每平方米8个脉冲） • 地面分类：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格式 • 已完成水文平坦化处理 • 栅格分辨率：0.5米每单元 • 辅助文件格式：ESRI Shapefile格式 元数据：可通过以下链接获取详细项目报告： 奥克兰激光雷达测绘报告（2024） | LINZ数据服务 奥克兰第二部分激光雷达测绘报告2024 | LINZ数据服务