The gap filling is based on the concept that we have to calculate the depth in the point (xc, yc). We define this as the function zc = f(xc, yc). If we place our self in this point, we can divide the world up into four quadrants Q1 - Q4. From here it’s a matter of finding some points from the raw data set relatively close to this point. The search radius for all possible techniques can be entered - in grid cell distance. Points outside this distance will never be taken into account.
Figure 10.1 Definition of quadrants
