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Working with Height Points
A Digital Terrain Model often consists of height points. Some of them may be insignificant and can be deleted, which is shown in the first video. Furthermore, this section demonstrates how to convert the height points to contour lines and then use them for screening. The lines can then be used for grid calculation.
Having worked through the chapter 
Basics and the section Modeling Terrain in this chapter is important for understanding the fitting of objects and the DTM.