Historic LIDAR Archive

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 100,000 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 Natural Resources Wales composite dataset contains digital elevation data derived from surveys carried out over several years and covers approximately 70% of Wales. We are making available 25cm, 50cm, 1m and 2m datasets, supplied as terrain models (a representation of the ground level) or surface models (a representation of object heights such as vehicles, buildings and vegetation). In addition to the height information, geo-referenced, coloured, shaded relief imag
es at the same resolution as the input LiDAR data grids are available.

激光雷达探测与测距（LIDAR）是一种航空测绘技术，其通过激光测量飞机与地面之间的距离。每秒可进行高达10万次地面测量，从而在25厘米至2米的空间分辨率范围内生成高度详细的地面模型。自然资源威尔士综合数据集包含从数年间的调查中提取的数字高程数据，覆盖威尔士约70%的区域。我们提供25厘米、50厘米、1米和2米的多个数据集，这些数据集以地形模型（地面水平的表示）或表面模型（如车辆、建筑和植被高度的表示）的形式提供。除此之外，与输入LiDAR数据网格相同分辨率的地理参考、彩色、阴影的地形图像也一并提供。