Name: LiDAR DSM Hillshade NYU 1m Dublin (ROI) ITM MH TIFF

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>LiDAR (Light Detection and Ranging) is a remote sensing technology, i.e. the technology is not in direct contact with what is being measured. From satellite, aeroplane or helicopter, a LiDAR system sends a light pulse to the ground. This pulse hits the ground and returns back to a sensor on the system. The time is recorded to measure how long it takes for this light to return. Knowing this time measurement scientists are able to create topography maps.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>LiDAR data are collected as points (X,Y,Z (x &amp; y coordinates) and z (height)). The data is then converted into gridded (GeoTIFF) data to create a Digital Terrain Model and Digital Surface Model of the earth. This LiDAR data was collected on 25th March 2015.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Digital Terrain Models (DTM) are bare earth models (no trees or buildings) of the Earth</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>s surface.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Digital Surface Models (DSM) are earth models in its current state. For example, a DSM includes elevations from buildings, tree canopy, electrical power lines and other features.</SPAN></SPAN><SPAN><SPAN> </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Hillshading is a method which gives a 3D appearance to the terrain. It shows the shape of hills and mountains using shading (levels of grey) on a map, by the use of graded shadows that would be cast by high ground if light was shining from a chosen direction.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This data shows the hillshade of the DSM.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This data was collected by New York University. All data formats are provided as GeoTIFF rasters. </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>Raster data is another name for gridded data. Raster data stores information in pixels (grid cells). Each raster grid makes up a matrix of cells (or pixels) organised into rows and columns. NYU data has a grid cell size of 1meter by 1meter. This means that each cell (pixel) represents an area of 1meter squared.</SPAN></P></DIV></DIV></DIV>

Service Item Id: 4032efb5aea34f1ea3ef60509e669051

Copyright Text: Geological Survey Ireland & New York University data licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence.

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