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Please note: This page is currently being updated.

After reading this page:

  • you've learned how the Tygron Platform treats terrain.
  • you've learned which terrain types are present in the Tygron Platform.
  • you've learned about the meaning of the different terrain attributes.
  • you've learned where to find and how edit terrains in a project.

What is meant by Terrain?

The Tygron Platform uses the term terrain to describe the composition of the surface, subsurface and their elevation in a project. This does not include any features built upon it, which are known as constructions.

Editor → Current Situation (Ribbon tab) → Terrain (Ribbon bar)


The Tygron Platform differentiates between various types of terrain. Each terrain type has its own predefined attributes that may have an effect on various indicators and overlays, such as green, livability and rainfall flooding. A description of all available terrain types is listed in the table below.

EN NL Description
Concrete Beton Commonly found in urban and industrial areas.
River water Boezemwater Larger water body, navigable for (small) boats.
Levee Dijk A construction usually built between a water body and low-lying land (polder) offering protection from flooding.
Dunes Duinen A naturally occurring landscape feature forming the division between the beach and the hinterland.
Breakwater Golfbreker A construction designed to protect the coastline from wave action.
Grassland Grasland Area dominated by grass vegetation.
Open land Open land The default terrain type for land surface. If an empty world is generated, this type will cover the entire map.
Water Water Small water body
Sand Zand Area largely consisting of sandy sediment.

Each surface terrain type contains the following attributes:

Attribute Unit Description
BUILDABLE Indication whether a terrain can be built upon or not.
GROUND_INFILTRATION_MD m/d Infiltration capacity of the surface soil into the subsoil. This attribute is used in calculations of the Rainfall Overlay.
HEAT_EFFECT °C Measure of impact on the heat stress overlay.
LIVABILITY_EFFECT Measure of impact on the livability overlay.
POLDER_WATER Value 1: it is possible to build a construction on top or near this terrain type. Value 0: the terrain is not buildable.
WATER Many constructions can only be built upon land, hence cannot occur on this terrain type. Water terrains play an important part in the calculations by the Water Module.
WATER_DEPTH_M m Whenever a new project is created by going through the new project wizard, the water terrains will have a value for the maximum depth. Respectively water: 2m and River water: 3m.
WATER_EVAPORATION_FACTOR Multiplication factor of the reference evaporation (see Rainfall Overlay).
WATER_MANNING s/m1/3 Measure of surface roughness, used in the surface flow computation of the Water Module.


The Tygron Platform differentiates between various types of subsurface terrain types. Subsurface terrain data was originally acquired from FGR, however, as of version 2019.0.0 this has become BRO. The Subsurface Overlay shows the different soil types composing the subsurface, each having distinctive predefined attributes. The table below shows a division into the different terrain categories, which, in turn, have their own subdivisions into multiple subsurface soil types.

EN NL Description
Gravel Grind
Clay Klei
Chalk Krijt
Loam Leem
Loess Löss
Unknown Onbekend Default, if no subsurface data is available.
Silt Silt
Peat Veen
Sand Zand
Marine clay Zeeklei

Each subsurface terrain type contains the following attributes:

Attribute Unit Description
ANGLE_OF_REPOSE angle (0-90°) 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.
BUILDABLE boolean Attribute determining whether or not the subsurface tolerates the construction of new buildings.
GROUND_INFILTRATION_MD m/d Infiltration capacity of the surface soil into the subsoil. This attribute is used in calculations of the Water Overlay.
PEAT_FRACTION fraction The fraction of the subsurface which will be considered to be peat by the Subsidence Overlay.
TOPLAYER_THICKNESS m The depth of the clay soil layer, as considered by the Subsidence Overlay
WATER_STORAGE_PERCENTAGE fraction Fraction of the volume of water that can be stored per volume of soil, usually expressed as the saturated minus residual water-content properties of the soil.


From the Terrain tab, the user can choose to manually change the current surface elevation model in the project, or to import one in the form of a GeoTIFF file. More information regarding the elevation model can be found on the terrain height page.