Constant Gradient Interpolation
Constant Gradient Interpolation Tool
To place new Spot Levels using the Constant Gradient Interpolation tool, you need to define:
- the position of a parent Spot Level,
- a fixed fall gradient,
- a fall direction.*
* “Fall direction” is synonymous with “flow direction” and “resulting grade”.
Start Constant Gradient Interpolation
To use Constant Gradient Interpolation:
- Go to:
- LAND4/Group Palettes/Show Spot Level Palette, or
- LAND4 Palette/Spot Levels
- Press Constant Gradient Interpolation button.
- Choose reference parent Spot Level.
- Enter Fall Percentage value in Fall Palette.
- Use Rubber Band line to indicate fall direction/flow direction/resulting grade.
- Place new, interpolated children Spot Levels.
- To exit tool, press Esc.
Parent Spot Level, peripheral
Illustrated below, is an example of how the z-values of the interpolated children Spot Levels are distributed if the reference point, the parent Spot Level, is located on the outer border of a selected area.
2D View
3D View
Parent Spot Level, centered
Illustrated below, is an example of how the z-values of the interpolated children Spot Levels are distributed if the parent Spot Level is placed in the middle of the selected area:
2D View
3D View
When a parent Spot Level is placed in center of an area:
- z-values of the interpolated Spot Levels to the left of the parent Spot Level will be directly proportional to their distance from the parent.
- z-values of the children Spot Levels to the right of parent Spot Level will be inversely proportional.
Level Lines
Using Level Lines is another way to present the result. The Level Lines depicted on the LANDSurface below are red and featuring an equidistance of 1 m.
They are perpendicular to the fall direction (the rubber band direction) used for generating the new Spot Levels and indicate the steepness of the created surface.
