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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 three parts covering the entire region are available at the following links: North Auckland Digital Elevation Model (DEM)0.5m 2024|AucklandCouncilOpneData Barrier Islands Digital Elevation Model (DEM) 0.5m - Overview 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征，属于三维表现形式，通常采用栅格形式——即由规则排布的方格或像素构成的网格——每个栅格单元存储对应位置的高程数值。DEM仅表征裸地地形表面，即剔除了树木、建筑物及其他各类地表附着物。 伍珀特公司（Woolpert）受奥克兰市议会委托，对奥克兰大区外围区域开展激光雷达（LiDAR）数据采集工作。本项目旨在与2024年奥克兰中心城区的NIWE激光雷达采集项目保持标准统一，本质是对该数据集的覆盖延伸。 此外，新西兰政府委托区域软件控股有限公司（Regional Software Holdings Limited, RSHL）聘请伍珀特公司，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数据采集工作。 覆盖整个奥克兰大区的三部分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）|奥克兰议会开放数据（AucklandCouncilOpneData） 屏障群岛0.5米分辨率数字高程模型（DEM）概览 两项勘测工作均需符合以下高标准要求： • 垂直精度：≤20厘米（95%置信区间） • 水平精度：≤100厘米（95%置信区间） • 发射脉冲密度：8个脉冲每平方米（8ppsm） • 地面分类等级：ICSM 2级 • 投影坐标系：NZTM2000 • 垂直基准面：NZVD2016 • 分幅方式：采用NZTopo50 1:1000比例尺分幅 • 总幅数：18036幅 • 数据格式：GeoTIFF • 水文平整处理 • 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：《2024年奥克兰激光雷达勘测报告》|新西兰土地信息局（LINZ）数据服务平台 《奥克兰第二部分2024年激光雷达勘测报告》|新西兰土地信息局（LINZ）数据服务平台