A12.7 LiDAR

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LiDAR (Light Detection And Ranging) is an optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target. The prevalent method to determine distance to an object or surface is to use laser pulses. Like the similar radar technology, which uses radio waves, the distance to an object is determined by measuring the time delay between transmission of a pulse and detection of the reflected signal. LiDAR therefore gives you an idea of the height of the ground surface above a given datum. This can then be plotted (see Figure A12.1) and can show old meander channel and other palaeo-features.

LiDAR elevation data can be downloaded for analysis in a GIS. Below are links to download LiDAR data

Figure A12.1 : Example of LiDAR Data