This module allows you to generate TIN (Triangulated Irregular Network) DTM from random points (with elevation data) or contour lines.
Unlike the DTM Grid module which performs smooth grid interpolation to generate the DTM surface, the TIN module relies on original data to generate the surface. This method produces DTM in the original form in accordance with the existing data conditions. This TIN approach is very suitable for technical work such as calculating volumes or generating original contour lines.
To generate TIN surface, make sure you already have points (with elevation data) or contour data on your maps and click DTM menu or tap anywhere on the maps. You can try to download sample txt file here to be imported on TIN module as DTM data source.
After successfully generated TIN surface, additional Tools menu will show up, this Tool is used to generate extra DTM points using Delaunay Refinement or Grid methods, calculate Cut And Fill Volume or generate dynamic Surface Elevation Profile.
This tool will densify the TIN points by interpolate centroid point on every TIN triangle and then regenerate the TIN surface, the process will iterate according to the desired number of iterations. To avoid “too dense” point on some area, you can ask to skip small triangle by defining minimum triangle size to process.
Please note that Delaunay Refinement is a heavy calculation process, higher number of iteration will increase calculating times and perhaps will make your device crash or running out of memory.
Grid Interpolation From TIN Surface
This tool generate regular 3D DTM grid point with elevation interpolate from TIN surface.