MnTopo2nd Generation Seamless Lidar DEM

Statewide Seamless 0.5m Lidar DEM, Minnesota, 2025 This data is a seamless representation of Lidar derived Digital Elevation Model (DEM) for the state of Minnesota. The data was collected between 2021 and 2023 at Lidar Acquisition Block (LABs) levels or work units within some LABs, lidar data was collected at work units level where they exist. Please see "Areas Covered" section of https://www.mngeo.state.mn.us/chouse/elevation/lidar_gen2.html for additonal information on LABs and work units. Data collection was guided by the Minnesota Lidar Plan, a collaborative effort led by the Minnesota Geospatial Advisory Council’s 3D Geomatics Committee and the Minnesota Geospatial Information Office (MnGeo), with support from federal partners such as USGS and FEMA. The plan outlines a comprehensive strategy to acquire new, high-resolution lidar data across the state to replace outdated datasets collected over a decade ago. The plan was driven by the need for more accurate elevation data to support a wide range of applications, including hydrologic modeling, infrastructure planning, forest resource assessment, and environmental monitoring. Minnesota’s lidar data collected between 2008 and 2012 (classified as QL3), no longer meets modern standards and fails to reflect significant landscape changes due to natural events and human development. The new data meets or exceeds USGS Quality Level 1 (QL1) standards, offering higher point density and improved accuracy. The seamless 0.5m Lidar DEM is made up of data only final vertical accuracy (FVA) checked Lidar data and organized by standards developed and accepted by Minnesota's 3D Geomatics Committee. The DEMs received from contractors were blended to remove overlaps that occurred between LABs and in some cases within LABs and reaggregated using GDAL tools and ArcGIS Pro. The creation of this seamless data was led by SMEs from Minnesota's Department of Natural Resources (DNR) with MnGeo's support, in collaboration with SME's from Federal, State and County agencies.明尼苏达州2025年全域无缝0.5米激光雷达（Lidar）数字高程模型（DEM）数据集。本数据集为明尼苏达州全域范围内基于激光雷达生成的无缝数字高程模型。数据采集于2021至2023年间，以激光雷达采集区块（Lidar Acquisition Blocks, LABs）为单位开展；部分区块内的作业单元亦单独完成了激光雷达数据采集。如需了解激光雷达采集区块及作业单元的详细信息，请参阅https://www.mngeo.state.mn.us/chouse/elevation/lidar_gen2.html页面的「覆盖范围」章节。 本次数据采集严格遵循《明尼苏达州激光雷达规划》实施。该规划由明尼苏达地理空间咨询委员会三维地理信息委员会与明尼苏达地理空间信息办公室（MnGeo）牵头协同制定，并获得美国地质调查局（USGS）、联邦应急管理局（FEMA）等联邦合作机构的支持。规划旨在构建一套覆盖全州的高精度激光雷达数据采集综合策略，以替代十余年前采集的老旧数据集。规划的核心动因在于亟需更为精准的高程数据，以支撑水文模拟、基础设施规划、森林资源评估与环境监测等多领域应用。 明尼苏达州2008至2012年间采集的激光雷达数据（分类等级为QL3）已无法满足现代应用标准，且未能反映自然事件与人类开发活动引发的显著地表变化。本次采集的新数据达到或超过美国地质调查局QL1质量等级标准，具备更高的点云密度与更优的精度表现。 本全域无缝0.5米激光雷达数字高程模型仅包含经过最终垂直精度（Final Vertical Accuracy, FVA）核查的激光雷达数据，并严格遵循明尼苏达州三维地理信息委员会制定并认可的标准进行组织。承包商提交的数字高程模型数据经融合处理以消除激光雷达采集区块间乃至部分区块内部的重叠区域，并通过GDAL工具与ArcGIS Pro进行重聚合。本无缝数据集的制作由明尼苏达州自然资源部（DNR）的领域专家（Subject Matter Experts, SMEs）牵头，在明尼苏达地理空间信息办公室的支持下，联合联邦、州及县级机构的领域专家共同完成。