# 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. --- # 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/reference_epw_parameters.md?ask= ``` 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.