LiDAR
LiDAR stands for Light Detection and Ranging, it is a remote sensing technology that uses laser scanning to collect height or elevation data. The Laser scanner used in OSi is an airborne Leica ALS50. The laser scanner emits 150,000 pulses every second creating a point cloud of millions of pixels collected in X,Y,Z (easting, northing and height). After capturing the raw point cloud each point is then classified into different layers i.e. Ground, Buildings and Vegetation. The final outputs from the point cloud are either a Digital Terrain Model (DTM) or a Digital Surface Model (DSM). These outputs are of high accuracy and give vertical accuracies between 15cms to 25cms depending on terrain.
Our LiDAR data is supplied in Irish Grid (IG) and Irish Transverse Mercator (ITM) in ASCll file format, at 2m posting and 25cm vertical accuracy for urban areas, and 10m posting and 50cm vertical accuracy for rural areas.
Download LiDAR coverage Index file here:
This LiDAR Index shows the areas of the country for which OSi currently has LiDAR data available. Additional information held within the file includes the name of the LiDAR tile, and the date it was flown.
This is a digital vector file held in ESRI shapefile format, and in ITM projection. It can be opened by any OGC compliant GIS software including ArcGIS, MapInfo and Cadcorp.
For more information
Please contact dominic.cronin@osi.ie or kevin.brady@osi.ie
Download a full product specification sheet below
LiDAR Lidar_prod_overview.pdf (0.37 MB, Adobe PDF)