The Elevation Void Fill function is used to create pixels where holes exist in your elevation.
Voids occur when there are no points collected within the area represented by a pixel in the resultant raster. Voids are often caused by water bodies, class type selection, or exclusion. Void filling is most commonly used when generating a ground surface.
This function uses the Plane Fitting/IDW void fill method. First a basic method is used, where the average of the eight neighboring values are calculated to fill small voids, then the plane fitting method is applied. If the error of the plane fitting method is too large, an inverse distance weighted (IDW) algorithm is applied.
There are two parameters for this function:
- Input Raster
- Max Void Width
Max Void Width
The maximum void width value is used to specify the largest size of a void that you want to fill. The units of this parameter is the same as the units used in your LAS file's spatial reference system. If the width or height of the bounding box around the void is larger than the maximum void width value, the void is not filled. If this parameter is blank or 0, no maximum width will be used, and all voids will be filled.