利用机载激光点云数据生产DEM的关键技术分析

着重分析了利用机载激光点云数据提取DEM的关键技术：预处理、点云滤波与分类、高精度DEM制作与质量评价技术；建立了基于机载激光点云的DEM生产技术流程，并将其应用于宁波市地理国情普查市情专项——高精度地表模型制作项目中；构建了宁波市建成区规则格网1：2000比例尺的高精度DEM模型，为宁波市地理国情普查提供了数据基础。

Key Technologies Analysis of DEM Production Based on LiDAR Data

The paper focuses on the analysis of the key steps of extracting DEM from airborne-LiDAR data， including point cloud data preprocessing, the data filtering and classification, high precision DEM manufacturing and quality evaluation.In this paper, the DEM production technology process based on airborne-LiDAR data is established, and will be used on a city situation special survey of geographical conditions: high precision surface modeling project in Ningbo. A high precision DEM model of 1∶2000 scale rule grid of Ningbo built-up area is constructed which provides a data base for the survey of geographical conditions in Ningbo.