THE BENEFITS OF TERRESTRIAL LASER SCANNING AND HYPERSPECTRAL DATA FUSION PRODUCTS
Other literature type
Buckley, S. J.
Kurz, T. H.
(issn: 2194-9034, eissn: 2194-9034)
Close range hyperspectral imaging is a developing method for the analysis and identification of material composition in many
applications, such as in within the earth sciences. Using compact imaging devices in the field allows near-vertical topography to be
imaged, thus bypassing the key limitations of viewing angle and resolution that preclude the use of airborne and spaceborne
platforms. Terrestrial laser scanning allows 3D topography to be captured with high precision and spatial resolution. The
combination of 3D geometry from laser scanning, and material properties from hyperspectral imaging allows new fusion products to
be created, adding new information for solving application problems. This paper highlights the advantages of terrestrial lidar and
hyperspectral integration, focussing on the qualitative and quantitative aspects, with examples from a geological field application.
Accurate co-registration of the two data types is required. This allows 2D pixels to be linked to the 3D lidar geometry, giving
increased quantitative analysis as classified material vectors are projected to 3D space for calculation of areas and examination of
spatial relationships. User interpretation of hyperspectral results in a spatially-meaningful manner is facilitated using visual methods
that combine the geometric and mineralogical products in a 3D environment. Point cloud classification and the use of photorealistic
modelling enhance qualitative validation and interpretation, and allow image registration accuracy to be checked. A method for
texture mapping of lidar meshes with multiple image textures, both conventional digital photos and hyperspectral results, is
described. The integration of terrestrial laser scanning and hyperspectral imaging is a valuable means of providing new analysis
methods, suitable for many applications requiring linked geometric and chemical information.