# Terrain

![](/files/-MihrcDUcf7kOlEw4eYy)

![](/files/-Ma9gLv5Sse1NXA0BCiq) - [\[source code\]](https://github.com/ladybug-tools/dragonfly-grasshopper/blob/master/dragonfly_grasshopper/src//DF%20Terrain.py)

Create a Terrain object representing the land on which an urban area sits.

This includes both the geometry and the properties of the pavement within the urban area.

## Inputs

* **terrain\_geo \[Required]**

  An array of Breps or meshes that together represent the terrian. This should include the entire area of the site, including that beneath building footprints. 
* **albedo**

  A number between 0 and 1 that represents the albedo (reflectivity) of the pavement. (Default: 0.1, typical of fresh asphalt). 
* **thickness**

  A number that represents the thickness of the pavement material in meters. (Default: 0.5 meters). 
* **conductivity**

  A number representing the conductivity of the pavement material in W/m-K. (Default: 1 W/m-K, typical of asphalt). 
* **vol\_heat\_cap**

  A number representing the volumetric heat capacity of the pavement material in J/m3-K. This is the number of joules needed to raise one cubic meter of the material by 1 degree Kelvin. (Default: 1.6e6 J/m3-K, typical of asphalt). 

## Outputs

* **terrain**

  A Terrain object that can be plugged into the "DF Assign Model UWG Properties" component to specify the terrain of an urban area. 


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ladybug.tools/dragonfly-primer/components/6_alternativeweather/terrain.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.