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LiDAR is a scanning system attached to the underside of a low-flying aircraft in order to pulse laser light at the surface of the Earth. This light is reflected back up to the system, where it is measured, creating a reliable reading of the 3D shape of the ground below.
The LiDAR data for part of Dublin comes in two maps. The areas can be viewed on this image here.
This mapping is Bare Earth filtered data, mapped by surveyors and omitting buildings and other topography. This provides bare ground topography, useful for getting an overview of the contours of an area, but not providing details of height of buildings.
Remote Sensing Data
UCD School of Geography has remote sensing images for Dublin purchased from BlueSky with the following specifications:
12.5cm 4 band in GeoTIFF (red, blue, green, infrared)
1m DSM in .asc format (digital surface model)
1m DTM in .asc format (digital elevation model)
1m TIR data in GeoTIFF (thermal imagery for mostly Inner City Dublin)
All data is in ITM95 projection
Terms and conditions apply for use of this data - to find out about t&cs and accessing the data please contact Mr Tine Ningal at Tine.Ningal@ucd.ie
This record serves as an index to a suite of high density, aerial remote sensing data for a 2km² area of Dublin, Ireland obtained at an average flying altitude of 300m. Collected in March 2015, the data include aerial laser scanning (ALS) from 41 flight paths in the form of a 3D point-cloud (LAZ) and 3D full waveform ALS (LAS and Pulsewave), and imagery data including ortho-rectified 2D rasters (RGBi) and oblique images.
This viewer created by the Geological Survey of Ireland (GSI) provides access to LiDAR data from these organisations: Geological Survey Ireland, Dept of Culture, Heritage and the Gaeltacht, Discovery Programme,Transport Infrastructure Ireland,New York University,The Office of Public Works and Westmeath County Council.
This LiDAR data can be downloaded and used in a GIS system. This YouTube video shows how to download the data and create a hillshade model: https://www.youtube.com/watch?v=cxo1VnNxmcE