Area Calculation

Area Calculation

Once the data has been read the area can be calculated using the 'Calculate Area Button'.

When complete the area plot will be displayed on screen, at the Z=0 plane. The calculated area value is shown in the table:

And is also echoed to the command line:

The number in the centre is the actual low HIC area as calculated in model units.

The table contains a 'By # Points' measurement. This is simply the ratio of high/low HIC points as contained in the input file. It may be of interest but is not as accurate as the calculated value.

The tool only interpolates, it does not extrapolate.

Area Calculation Method

The steps for calculating the low HIC area % are as follows:

1. Create a 'fine' grid of points based on the grid size input parameter. This is typically 10% of the input point spacing.
2. Determine which of the fine points are within the perimeter.
3. Calculate a HIC value for each of the fine grid points by interpolating from the coarse spaced input points.
4. Calculated the ratio of fine low HIC values to the total.

Note: controls for user defined perimeters and Child WAL input can be found in the Utilities tab.