Terrain Attributes

List of attributes relevant to Terrains and Terrain Types.

Icon	Attribute	Unit	Layer	Range	Description
	ANGLE_OF_REPOSE	angle (0-90°)	Ground		The different subsurface types each attain a value for the maximum slope (Dutch: talud). This value is used for creating the water edge steepness and indirect for the water depth.
	BOWEN_RATIO	ratio	Surface	0.001 to 10	The ratio between two forms of heat transfer between this terrain's surface and the atmosphere.
	BUILDABLE	boolean	Both	0 or 1	Whether it is permitted to place Buildings here
	COLOR	Color	Both		The color of the terrain.
	GROUND_INFILTRATION_MD	m/day	Surface	0.0 to 10.0	The speed at which water can flow vertically from the surface to the unsaturated zone.
	GROUND_INFILTRATION_MD	m/day	Ground	0.0 to 10.0	The speed at which water can flow vertically from the unsaturated zone to the saturated zone.
	HEAT_EFFECT	°C	Surface		Measure of impact on the Heat Stress Overlay with the UNESCO-IHE model
	HYDRAULIC_CONDUCTIVITY_MD	m/day	Ground		Hydraulic conductivity (K) is a measure of the ease with which water can move through pore spaces or fractures in a saturated medium.
	HYDRAULIC_CONDUCTIVITY_WITH_THICKNESS_MD	m2/day	Ground		This attribute represents the horizontal hydraulic conductivity (KD) of the saturated layer multiplied by the layer thickness.
	LIVABILITY_EFFECT		Surface		Measure of impact on the Livability Overlay.
	VAN_GENUCHTEN_M	fraction	Ground	0.05 to 1.0	Van Genuchten Soil Parameter M needed to calculate the Soil Water Retention Curve in the Unsaturated Zone.
	PEAT_FRACTION	fraction	Underground		The fraction of the subsurface which will be considered to be peat by the Subsidence Overlay.
	ROOT_DEPTH_M	m	Surface		The depth of the roots of the Terrain Type. This depth is used to determine whether evaporation will occur from the groundwater.
	SUBSIDENCE	boolean	Ground		Whether or not subsidence should be calculated for a terrain or in a given area. Subsidence is calculated when the value is not equal to 0.
	TERRAIN_MIX		Surface
	TEXTURE_TYPE	Integer	Surface	0 to 2	Value used to select the terrain blend color.
	TOPLAYER_THICKNESS	m	Ground		The thickness of the top layer covering the peat, for the calculation of the compaction component of subsidence, as considered by the Subsidence Overlay.
	VEGETATION_FRACTION	fraction	Surface		The amount of green which this Terrain Type provides per m².
	WATER	nominal	Surface		Whether this Terrain Type represents a form of water (and what type).
	WATER_DEPTH_M	m	Surface		The default depth of this water Terrain Type, relative to the surrounding elevation.
	WATER_TRANSPIRATION_FACTOR	factor	Surface		How fast this terrain can evaporate water from the ground. The weather's evaporation speed is multiplied by this factor to determine the rate of transpiration.
	WATER_MANNING	s/(m1/3)	Surface		The Gauckler–Manning coefficient of the terrain, which is a measure of surface roughness. Used in the surface flow computation of the Water Overlay.
	WATER_MICRORELIEF_M	m	Surface	0 - 0.255	The defined Microrelief in meters, which captures surface water. When captured, surface flow is halted until the defined threshold is reached. Evaporation and infiltration for water captured in Microrelief is still allowed.
	WATER_STORAGE_PERCENTAGE	fraction (m3/m3)	Ground		The percentage (as a fraction) of the ground layer volume which can be filled with water. A lower percentage means the ground layer will be able to store less water, and the saturated zone will rise higher with the same amount of water in the ground layer.

API Endpoints

• Api session items terraintypes
• Api session event editor terraintype set attribute
• Api session event editor terraintype set attributes