Settings

Elevate Boundary

Elevate Boundary is a function found in the "Input" chunk - see. "Fundamentals" for more details.

The function requires a set of closed polygons as input. Polygons with an area less than the value given here, will be filtered away from the selection set. The option has it's primary use to exclude small sized buildings that are insignificant to the analysis. This will also help improve on the overall calculation speed.

Fillsink

Filling sinks refers to the process of modifying the terrain grid to remove depressions or pits that do not drain to any other cell - see the section "Fundamentals" for more details.

To further avoid flat areas the fillsink operation will incrementally rise the elevation with the given value until it reaches an elevation that secures water to find a way out.

Drainage Lines

When calculating and displaying Drainage Lines the amount of data can seriously affect the performance and calculation time on a computer.  To reduce the amount of data involved, the function is equipped with two filters - Strahler Order and Flow Accumulation Filtering. They can be applied separately or combined.

When applying Flow Accumulation (FA) Filtering - Drainage Lines will not be displayed when the FA value of a grid cell is below the selected option.

To simplify the use of the filter, the function uses a drop-down-list that can be tailored in this setup. The filter will remove grid cells when the FA value is below the percentage relative to the Max value in the model - displayed above the table.

Example:
If the Max FA value i 50 000, using a 1% filter will remove grid cells with a value of 500 and below.

Tip:
If you want to only use Strahler Order for filtering, set all the "Default" values to None.

Grid Elevation

Grid Elevation is a function found in the "Tools" chunk and displays elevations as labels on the screen by picking locations. This option give two methods to how the elevation is calculated.

Use nearest grid point
Finds the nearest grid point and extracts the elevation value. A fast method and with acceptable accuracy when the grid size is small.

Use interpolation
Calculates an exact elevation using a weighted interpolation in four directions (north, south, east and west).