> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/dragonfly-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/dragonfly-primer/components/6_alternativeweather/reference_epw_parameters.md).

# Reference EPW Parameters

![](/files/-Ma9gME7a-SX7nP2CYyK)

![](/files/-MihraPrmE_27v3B4_OC) - [\[source code\]](https://github.com/ladybug-tools/dragonfly-grasshopper/blob/master/dragonfly_grasshopper/src//DF%20Reference%20EPW%20Parameters.py)

Create Reference EPW Site parameters that represent the properties of the stie where rural EPW data was recorded for an Urban Weather Genrator (UWG) simulation.

## Inputs

* **obstacle\_hght**

  A number that represents the height in meters of objects that obstruct the view to the sky at the weather station site. This includes both trees and buildings. (Default: 0.1 m). 
* **veg\_cover**

  A number between 0 and 1 that represents the fraction of the  reference EPW site that is covered in grass. (Default: 0.9). 
* **temp\_hght**

  A number that represents the height in meters at which temperature is measured on the weather station. (Default: 10m, the standard measurement height for US DoE EPW files). 
* **wind\_hght**

  A number that represents the height in meters at which wind speed is measured on the weather station. (Default: 10m, the standard measurement height for US DoE EPW files). 

## Outputs

* **epw\_site**

  Reference EPW site parameters that can be plugged into the "DF UWG Simulation Parameter" component to specify the behavior of vegetation in the simulation.