In the fourth of seven videos, Dr. Chris Hopkinson describes the typical workflow that is followed in processing the raw returns data into a point cloud and raster modelling to typically produce a digital elevation model. Tiling of data is required to batch process portions of the total project. Aircraft position needs to be accounted for. Quality control for flight line overlaps needs to be considered. Ground control for the project needs to be reliable and properly interpreted. Classifying the point cloud is next. DEM and canopy height models and leaf are index are output modeled products. Rasterization usually requires interpolation of LiDAR data, usually by aggregation. Dense forests and the search radius can create data voids. The raster method does impact modelling results.
This presentation was made in Lethbridge in June, 2014.
