Example of Contour lines

In Fig. 13 you can see an example where the contour lines were calculated with the Cubic method, in intervals of 1.0 m. Main curves of height multiple of 5.0 m were drawn using a thick line. Please, see here an animated version of the steps required to achieve a similar result (5´).

Fig. 13
In Fig. 14 you can see a more complex example. In black we have presented a region where we do not want the contour lines to appear. You can define as many as you want. The red border separates a region where the interpolation method was the Cubic one, while the green one corrsponds to Kriging. The contour line themselves are indicated in blue and green.
Notice that the numbers inherit its colors from the corresponding line. Other detail worth mentioning is that the regions might share data points, both at its border or in the interior.
The contour lines will be calculated only in points which both belong to the convex polygon of the dataset (thus assuring an interpolation and not an extrapolation), to the specified region and also are external to the forbidden areas (or "holes") which could have been specified. In the upper part of the green region there is a curve which does not cut itself and does not end at the borders. Also at the right of the image there are some others. The reason in both cases is that the curve hits the border of the convex polygon (not shown), and by definition it could not go beyond that.
In more general cases, the green region might be an excavated area, where no natural morphology exist. EasyDEM has the ability to handle more than one interpolation method, so in this case it is more reasonable to choose one which allows non-continuos slope inside the green region (like the traditional Linear TIN), and different options outside, over natural ground (like the Cubic or Kriging).

Fig. 14