Environment Agency LiDAR data has a vertical accuracy of 5-15cm +/- RMSE and a horizontal accuracy of 40cm +/- RMSE [1] These kind of accuracy measures are usu

Environment Agency LiDAR data has a vertical accuracy of 5-15cm +/- RMSE and a horizontal accuracy of 40cm +/- RMSE [1] These kind of accuracy measures are usually relative to the national datum. They can be more accurate relative to other points in the same survey. [1] http://www.getmapping.com/support/height-lidar-data/how-accurate-height-data-and-lidar http://www.getmapping.com/support/height-lidar-data/how-accu...