Figure 9: The interpolated plot as visualized by 2D Delaunay triangulation method.
The returned interpolated values \(z_{i}\) based on test point (\(x_{q},y_{q}\)) are plotted in Figure 10. However, 2D interpolation method does not extrapolate but fill the values which are not within the input area with ’nan’ values by default, illustrated in Fig. 10 (a) as the area in white color. As can be seen in Fig. 10(b), these ‘nan’ values can be replaced by numeric ‘1’, illustrated as the area in blue color.