50cm LIDAR Composite DSM & DTM for Scotland

This metadata record is for Approval for Access product AfA458. Light Detection and Ranging (LIDAR) is an airborne mapping technique, which uses a laser to measure the distance between the aircraft and the ground. Up to 300,000 measurements per second are made of the ground, allowing highly detailed terrain models to be generated at spatial resolutions of between 25cm and 2 metres.
The Environment Agency’s LIDAR data archive contains digital elevation data derived from surveys carried out by the Environment Agency's specialist remote sensing team.
This dataset is derived from a combination of our full dataset which has been merged and re-sampled to give the best possible coverage. Data is available at 2m, 1m, 50cm, and 25cm resolution. The dataset can be supplied as a Digital Surface Model produced from the signal returned to the LIDAR (which includes heights of objects, such as vehicles, buildings and vegetation, as well as the terrain surface) or as a Digital Terrain Model produced by removing objects from the Digital Surface Model.
The dataset can be presented as an ESRI Binary Grid which contains height values, or as a georeferenced JPEG which is an image showing what LIDAR looks like when loaded into specialist software. Attribution statement: © Environment Agency copyright and/or database right 2016. All rights reserved.

本元数据记录针对批准访问产品 AfA458。激光雷达（LIDAR）是一种航空测绘技术，它利用激光测量飞机与地面之间的距离。每秒可进行高达30万次对地面的测量，从而能够在25厘米至2米的空间分辨率下生成高度详细的地形模型。环境署的激光雷达数据档案包含了由环境署专业遥感团队进行的调查所得的数字高程数据。本数据集由我们的完整数据集合并并重采样而成，以提供最佳覆盖范围。数据以2米、1米、50厘米和25厘米的分辨率提供。该数据集可以以激光雷达返回信号的数字表面模型（包括物体的高度，如车辆、建筑物和植被，以及地形表面）的形式提供，也可以在去除数字表面模型中的物体后生成的数字地形模型的形式提供。数据集可以呈现为包含高度值的ESRI二进制网格，或作为地理参考的JPEG图像，该图像展示了当激光雷达加载到专业软件中时的样子。版权声明：© 环境署版权和/或数据库权利2016。版权所有。