LiDAR is processed automatically to seperate the returns into
ground and vegetation files. This allows us to create 'bare earth'
models without buildings or trees. The LiDAR can be processed
in order to produce a variety of products including contour maps,
cross-sections and digital elevation models (explained in information
bar on the right). Once the point cloud has been processed into
grid format (DEM), a variety of maps can be made, including shaded
relief maps, vector maps (showing water flow), 3D perspective
maps, slope maps, hillshade maps and ortho-drape maps. We can
also compute volumes from the DEM's and have analysed differences
between DEM's on beaches to quantify changes in beach volume.
In combination with cross sections, we were able to show how wave
action was affecting the beach profile.
AND GEOID / ELLIPSOID MODELLING - Aerial
laser scanner systems compute positions and heights using GPS.
The GPS system uses the WGS84 ellipsoid to reference it's heights.
If you want to accurately convert these heights to a more usable
geoidal height (eg height above sea level), then you need an accurate
model of the geoid, local to your area of interest. Accuratemaps Survey
Partnership have developed software solutions that allow for the
conversion of huge data quantities from one co-ordinate system