Terrain

What is Terrain?

Terrain in the Tygron Platform, describes the surface and sub-surface (underground) and elevation of your project. Terrain excludes everything which is build-up on the terrain, which is described in buildings. Terrain can be edited via GEO DATA -> Terrain. For the Underground terrain the FGR data is used and in the 2019.0.0 version of the Tygron Platform the BRO data is used. The Underground Overlay shows the different types of soil in the Underground.

Surface

In the Tygron Platform there are different terrain types are available. Each land type has different predefined attributes that affect indicators and overlays such as green, livability and the rainfall flooding. All types are described in the table below.

EN	NL	Description
Concrete	Beton	This land type can mostly be found in urban and industrial areas
River Water	Boezemwater	Larger water bodies, navigable for (small) boats
Dike	Dijk	Dike is a land type that usually lays between water and constructions, or other areas which need to be protected. Dikes are constructed phenomenon, offering protection from floods and high tides
Dunes	Duinen	Dunes is a land type that usually lays between the beach and the rest of the land mass. Dunes are a natural phenomenon, a row of wind shaped sandy hills, protecting the inland from floods and high tides. Sometimes, due to erosion, dunes also occur inland and can eventually develop into a large arid region - the Sahara sand dunes.
Dike	Breakwater	Breakwater is land type designated to protect the actual coast line from waves, floods and tidal erosion.
Grasland	Grassland	All that is grass
Open land	Open land	This is the default land type for land in the Tygron Platform. If an empty world is generated, all land will have this land type
Water	Water	Small water bodies
Sand	Zand	All that is sand

Each surface terrain-type has the following attributes:

Attribute	Unit	Description
BUILDABLE		Indication if a terrain can be built upon or not.
GROUND_INFILTRATION_MD	meter per day	Limitation in capacity of ground infiltration from the surface into the sub-soil, used in the Rainfall Overlay
HEAT_EFFECT	degrees celsius	Impact of terrain on the heat stress overlay
LIVABILITY_EFFECT		Impact of terrain on the livability overlay
POLDER_WATER
SAFETY
TERRAIN_MIX
TEXTURE_TYPE
WATER		Whether this is a water-type terrain. This means constructions that can only be built on land cannot be built on this terrain. In addition, it also counts as a water terrain for overlay calculations. If 1, cells of this type will average the waterlevel, if 0, surface flow will be computed (see Rainfall Overlay)
WATER_EVAPORATION_FACTOR		Factor by which the reference evaporation (see Rainfall Overlay) is multiplied
WATER_MANNING	s/[m1/3]	Roughness of the surface, used in the surface flow computation of the Rainfall Overlay.

Underground

In the Tygron Platform there are different underground types available. Each land type has different predefined attributes that affect rainfall flooding.

EN	NL	Description
Clay	Klei	Terrain with a clay underground layer
Loess	Löss	Terrain with a loess underground layer
Unknown	Onbekend	Default underground if no data is available for your project
Peat	Veen	Terrain with a peat underground layer
Sand	Zand	Terrain with a sand underground layer
Marine clay	Zeeklei	Terrain with a marine clay underground layer

Each surface terrain-type has the following attributes:

Attribute	Unit	Description
GROUND_INFILTRATION_MD	meter per day	Limitation in capacity of ground infiltration from the surface into the sub-soil, used in the Rainfall Overlay
WATER_STORAGE_PERCENTAGE		Volume of water that can be stored per volume of soil, usually expressed as the saturated minus residual water content properties of soil

Elevation

In the terrain menu, the user can change the elevation-model in the project or import/select an elevation model Geotiff. More info on elevation can be found on the terrain height page