About the Plane Fit

The plane fit parameter is used to determine the 'goodness of fit' of the particular plane under consideration. The plane fit is the square root of the first eigenvalue (i.e., the standard deviation of the residuals for the fitted points). The plane fit value represents the variance of the residuals of the fitted plane. This value is used to determine if the fitted plane is a good fit where planes with values above the plane fit value would not be classified. The plane fit value is linear and the default value for this parameter is appropriate for most cases.

Effects of Increasing or Decreasing the Plane Fit

• Increasing Value: Increasing the plane fit value will result in more points being classified. Higher plane fit values will classify more points because the points under consideration are allowed more variation in respect to the orthogonal distance to the fitted plane resulting in more vegetation patches being classified. In addition, objects of interest (e.g., buildings with rough roofs) with rough surfaces might be classified by increasing the plane fit value.
• Decreasing Value: Decreasing the plane fit value will result in less points being classified. Lower plane fit values will classify less points because the points under consideration are allowed less variation in respect to the orthogonal distance to the fitted plane resulting in less vegetation patches being classified. In addition, fewer objects of interest (e.g., buildings with rough surfaces) with rough surfaces are classified by decreasing the plane fit value.

How Modify the Plane Fit

Plane Fit Box

1. On the Planar Point Filter property page, type a new Plane Fit value into the Plane Fit box.
2. Click the Apply button to commit the changes.