Generate Terrain Data in Global mapper 

The first method Global Mapper offers to generate elevation grid layers is the Triangulated Irregular Network or TIN method. This method connects 3D point features or the vertices of 3D line and area features into a network of triangles. From there, the program interpolates over the triangular faces using the feature elevation and slope values to generate an elevation grid layer.
With the Lidar Module, Global Mapper not only provides point cloud classification and processing tools, but the program also provides additional methods for generating an elevation grid. These additional options are all variations on the binning method. This method is better suited for point cloud processing because not every single point in the point cloud is used to generate the output grid.