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vector; 2) a rectangular grid of equal-spaced corner/point heights; or,
                  3)  an irregularly  spaced  set  of points  connected as triangles  (TIN  –
                  Triangular Irregular Network).
























                             Figure 3.2. Contour lines superimposed on grid DTM

























                               Figure 3.3. Grid DTM terrain relief representation
























                                   Figure 3.4. TIN terrain relief representation

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