LIDAR Composite Digital Terrain Model (DTM) 10m

The LIDAR Composite DTM (Digital Terrain Model) is a raster elevation model covering ~99% of England at 10m spatial resolution. The DTM (Digital Terrain Model) is produced from the last or only laser pulse returned to the sensor. We remove surface objects from the Digital Surface Model (DSM), using bespoke algorithms and manual editing of the data, to produce a terrain model of just the surface.

The digital terrain model has been resampled to 10 metres from the LIDAR Composite DTM 2m dataset using a bilinear interpolation technique.

Produced by the Environment Agency in 2022, the DTM is derived from a combination of our Time Stamped archive and National LIDAR Programme surveys, which have been merged and re-sampled to give the best possible coverage. Where repeat surveys have been undertaken the newest, best resolution data is used. Where data was resampled a bilinear interpolation was used before being merged.

The 2022 LIDAR Composite contains surveys undertaken between 6th June 2000 and 2nd April 2022. Please refer to the metadata index catalgoues which show for any location which survey was used in the production of the LIDAR composite.

The data is available to download as a single GeoTiff raster aligned to the OS National grid. The data is presented in metres, referenced to Ordinance Survey Newlyn and using the OSTN’15 transformation method. All individual LIDAR surveys going into the production of the composite had a vertical accuracy of +/-15cm RMSE. Attribution statement: © Environment Agency copyright and/or database right 2022. All rights reserved.

激光雷达（Light Detection and Ranging, LIDAR）合成数字地形模型（Digital Terrain Model, DTM）是空间分辨率为10米、覆盖英格兰约99%区域的栅格高程模型。该数字地形模型源自返回传感器的最后一束或唯一一束激光脉冲。我们通过定制化算法与人工数据编辑，从数字地表模型（Digital Surface Model, DSM）中移除地表物体，以生成仅包含地表的地形模型。

本数字地形模型由2米分辨率的LIDAR合成DTM数据集通过双线性插值法重采样至10米分辨率。

该DTM由英国环境署（Environment Agency）于2022年制作，整合了带时间戳的存档数据集与国家LIDAR计划勘测数据，经合并与重采样以实现最优覆盖范围。若存在重复勘测，则采用最新、分辨率最高的数据集。若需对数据进行重采样，则先通过双线性插值处理后再行合并。

2022版LIDAR合成数据集包含2000年6月6日至2022年4月2日期间开展的所有勘测数据。如需了解任意区域用于合成LIDAR数据集的勘测详情，请参阅元数据索引目录。

该数据可作为符合英国国家电网坐标系（OS National Grid）的单幅GeoTiff栅格文件下载。数据以米为单位，以英国地形测量局纽林基准面（Ordnance Survey Newlyn）为参考基准，并采用OSTN’15转换方法。所有用于合成该数据集的单份LIDAR勘测数据的垂直精度均为±15cm均方根误差（Root Mean Square Error, RMSE）。版权声明：© 英国环境署2022年版权及/或数据库权利，保留所有权利。