LAND4 for ARCHICAD

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Constant Gradient Interpolation

Constant Gradient Interpolation Tool

To place new Spot Levels using the Constant Gradient Interpolation tool, you need to define:

* “Fall direction” is synonymous with “flow direction” and “resulting grade”.

Start Constant Gradient Interpolation

To use Constant Gradient Interpolation:

  1. Go to:
    • LAND4/Group Palettes/Show Spot Level Palette, or
    • LAND4 Palette/Spot Levels
  2. Press Constant Gradient Interpolation button.
  3. Choose reference parent Spot Level.
  4. Enter Fall Percentage value in Fall Palette.
  5. Use Rubber Band line to indicate fall direction/flow direction/resulting grade.
  6. Place new, interpolated children Spot Levels.
  7. To exit tool, press Esc.
Constant Gradient Interpolation. Parent Spot Level marked with red, fall percentage entered in Fall Palette, and rubber band line indicating fall direction/flow direction/resulting grade.

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
Constant Gradient Interpolation. Parent Spot Level peripherally placed.
3D View
3D View of created LANDSurface. The interpolated Spot Levels are inversely proportional with the distance from the parent Spot Level.

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
Constant Gradient Interpolation main elements
Constant Gradienet Interpolation. 2D view. Parent Spot Level placed in center. Fall percentage shown in Fall Palette and rubber band line defining fall direction.
Constant Gradienet Interpolation. 2D view. Parent Spot Level placed in center.
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.
Constant Gradienet Interpolation. 3D view. Parent Spot Level placed in center.
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.

3D view of LANDSurface showing Level Lines to be perpendicular to the direction defined by the rubber band line.
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