To theme terrain

Terrain Themes allow you to compare terrain based on Level, Aspect, or Slope.

1. Click to open the Terrain Themes Palette.
2. In the Terrain Shading palette, click (Add a New Theme).
3. In the Theme Parameters area, do the following:
   • Enter a name for the theme.
   • For Analysis Type, select Level, Aspect, or Slope.
   • Specify the Minimum and Maximum values.

     Use these values to constrain the theme to specific areas. For example, when theming by level, enter a Minimum of 100 metres and a Maximum of 1000 metres to omit levels at sea level and those above 1000 metres.

   • For Distribution, indicate the method used to determine the theme range. For details, see the "Advanced Tips" section below.
   • Indicate the Number of Rules.
   • If you're theming by aspect, for Minimum Horizontal Slope, indicate the lowest slope degree value to consider in the theme.
4. Under Colour Range, specify the following:
   • Transparency: Use the slider to indicate how much of the underlying styling you can see once the theme is applied. A higher setting makes the theme more transparent.
   • Colour From and Colour To: InfraWorks 360 creates a colour ramp between the first colour in the theme (Colour From) and the Colour To selection. The Preview area displays the colour ramp.
   • Palette Type: For details, see the "Advanced Tips" section below.
5. Click OK to apply the theme.

Advanced Tips

If you have added contours or rasters as part of the terrain, they're included in the theme. The results are shown as soon as you apply the theme. You don't need to regenerate the model.

The Preview area at the bottom of the dialogue box shows the current theme settings.

The following distribution methods are available:

Method	Description
Equal	The difference between the high and low values is the same for every range. This method is easy to interpret and is useful for showing continuous data such as height.
Standard Deviation	Features are placed in ranges based on how much their values vary from the mean. InfraWorks 360 calculates the mean and then adds or subtracts the standard deviation to or from the mean to create the ranges.
Quantile	Each range contains an equal number of features. This method is useful for showing data in which values are evenly distributed.
Jenks (Natural Breaks)	Ranges are based on natural groupings of data values. Features with similar values are grouped. This method shows the natural groupings in the data.
Individual Values	Features are not grouped. This distribution is useful if values are not continuous, there is a fixed number of values and many features have the same value.
Logarithm	Evaluates the highest and lowest value and creates a logarithmic scale for distributing the values. This distribution is good for analysing data distributed along multi-modal and other non-normal curves.

The following palette types are available:

Palette Type	Definition	Description	Visual
HSV CCW	Hue, Saturation, Value; Counterclockwise	Determines the interim colours between the Colour From hue and the Colour To hue going counter-clockwise.
HSV CW	Hue, Saturation, Value; Clockwise	Determines the interim colours between the Colour From hue and the Colour To hue going clockwise.
RGB	Red, Green, Blue	Determines the interim colours based on their red, green and blue components.
User Defined	Click the browse button next to this field to see the Set up User Defined Colours dialogue box, where you can select individual colours for the elements in the colour ramp.