Terrain editing features are used to manipulate the DEM for numerous purposes, such as leveling undesired objects out or simulating a smooth slope. Terrain editing can always be done on a duplicated DEM for comparison. Remember that these tools can be accessed from the toolbar and from the properties panel when a polygon is selected, because any polygon can be used to apply leveling and cutting/cropping/hole filling to the DEM.
Level by Averaging
This tool allows levelling of the selected area to smooth the surface. New surface values are calculated using the Inverse Distance Weighting (IDW) interpolation method where all DEM points along the edge of selection polygon are used as the input data. As a result a brand new and smooth surface is created in the constraints of the selection (polygon). Below is an example of unleveled and leveled terrain using the averaging method.
- Level by Maximum
The tool allows levelling the selected area by elevating the surface according to the maximum vertex height value on the selected area (or polygon). Thus, the whole selected area is visually lifted to the highest point of the selection. To return to the prior state of the surface, click Undo.
Level by Minimum
This tool allows levelling the selected area by lowering the surface according to the minimum vertex height value on the selected area. Thus, the whole selected area is visually lowered to the lowest point of the selection.
Level by Offset
This tool allows levelling the selected area by entering an offset amount. The terrain will be raised up or lowered down by the amount entered while keeping the angle of the slope and all other features.
Level by Point
This tool allows leveling the surface by a perfect plane at the height of the selection. After selecting the area for leveling left click mouse button on any spot on the DEM and it will level the area to the height of the selected spot. The result will vary according to the spot that has been used for leveling but the plane itself will be flat and parallel to the gravitational plane, similarly to the minimum and maximum leveling tools. Below and example of level by point when select approximate middle height of the pile.
Level by base plane - available only in polygon properties
This tool allows leveling the polygon area using the selected base plane. For example if a fitted plane is selected the DEM will be leveled identically to that plane. Plane can be seen in white inside of each polygon. Any plane can be used for leveling.
Below and example of a polygon with the fitted plane selected and used for leveling.
DEM editing options¶
This tool allows cutting the hole in the model surface or cutting along the DEM edges to make the edges more aesthetically acceptable. To return to the prior state of the surface, click Undo.
This tool allows cropping the model according to needs. Keep in mind that whole DEM will be cropped when using this tool. To return to the prior state of the surface, click Undo.
This tool allows filling holes on the model surface in case the amount points on a definite area was insufficient during the reconstruction, and the model surface could not be reconstructed evenly. If the DEM was generated using the hole filling option, this tool may not be needed.