LIDAR DSM Time Stamped Tiles

The LIDAR DSM (Digital Surface Model) Time Stamped Tiles product is an archive of raster elevation data produced by the Environment Agency. Site specific surveys have been carried out across England since 1998, with certain areas, such as the coastal zone, being surveyed multiple times. Data is available at varying resolutions of 25cm, 50cm, 1m and 2m, depending on project requirements.

The DSM (Digital Surface Model) is produced from the last return LIDAR signal and includes heights of objects, such as vehicles, buildings and vegetation, as well as the terrain surface.

Available to download as Geotiff rasters in 5km zips, data is presented in metres, referenced to Ordinance Survey Newlyn and data aligned to the OS Grid. All LIDAR data has a vertical accuracy of +/-15cm RMSE. The transformation used on the data is specific to the time period of survey.

Please refer to the metadata index catalogue which show, for any location, what time stamped data is available, the specific dates of survey, resolution of product and what transformation and geoidal model used. Attribution statement: © Environment Agency copyright and/or database right 2019. All rights reserved.

LIDAR 数字表面模型（DSM）时间戳图块产品是由环境署生成的栅格高程数据档案。自1998年以来，在英国各地进行了特定地点的现场调查，某些区域，如海岸带，已被多次调查。数据根据项目需求，提供25cm、50cm、1m和2m等不同分辨率。数字表面模型（DSM）由最后返回的LIDAR信号生成，包括车辆、建筑物和植被等物体的高度以及地形表面。数据以Geotiff栅格形式提供，以5km压缩包下载，单位为米，参考新林测量局（Ordinance Survey Newlyn），并按OS网格对齐。所有LIDAR数据的垂直精度为±15cm均方根误差（RMSE）。所使用的数据转换针对调查的时间段特定。请参阅元数据索引目录，该目录显示了任何位置的时戳数据可用性、具体的调查日期、产品分辨率以及所使用的转换和地球椭球模型。归属声明：© 环境署版权和/或数据库权利2019。版权所有。