# Surveys to Design

Instead of drawing walls (either manually or automatically) in the **Simulation** view, and using that as the basis for a network design, it is possible to use the results of a site survey as the basis for the simulation. The site survey data can be gathered with Hamina Onsite, or by importing site survey data from NetAlly Link-Live.

The site survey data is used to create a map of attenuation, or areas on the map that block or reduce Wi-Fi signals. If available, the attenuation map is augmented by walls that are automatically traced on the floorplan.

## Using a Survey to Create a Simulation

1. Perform a site survey using Hamina Onsite. This can either be for an existing network on the site, or by using an AP on a stick method. When performing the survey, it's a good idea to survey both sides of most walls and obstacles, and to [use the correct surveying technique](https://docs.hamina.com/onsite/basics/site-surveys).

2. Open the project in Hamina Network Planner.

3. On large projects, you will see a progress indicator that shows that the survey results are being used to teach the simulation. On small projects, this can happen so quickly that you will not see a progress indicator.<br>

   <div align="left"><figure><img src="https://1547340717-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzUQ3TfKTYBeb6nf9W8Hv%2Fuploads%2FH5Hc5QDQdMg7PNSo6b80%2Fteaching-simulation.png?alt=media&#x26;token=e694dcb2-1f71-403c-a7ee-35e326a0208a" alt="" width="563"><figcaption></figcaption></figure></div>

4. By default, Hamina Network Planner will automatically choose the best prediction mode, based on what data is available in the project. You can view which prediction model Hamina has selected in the **Global heatmap settings** popover:<br>

   <div align="left"><figure><img src="https://1547340717-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzUQ3TfKTYBeb6nf9W8Hv%2Fuploads%2FvSx2XDqbijL4OI234gnm%2Fauto-prediction-input.png?alt=media&#x26;token=7f1e4de8-8413-464a-84d7-5dbf02f2ba68" alt="" width="563"><figcaption></figcaption></figure></div>

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   To force Hamina Network Planner to use Environment Learning (with Site Surveys), disable **Auto-select prediction input**, and select **Env Learn (Survey)** for simulations.<br>

   <div align="left"><figure><img src="https://1547340717-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzUQ3TfKTYBeb6nf9W8Hv%2Fuploads%2FeWIQE4DzNYGCZX3E5LWz%2Fmanual-prediction-input.png?alt=media&#x26;token=519da9b1-2eef-414c-8c84-36632b8da6cd" alt="" width="563"><figcaption></figcaption></figure></div>

5. With the **Simulation prediction mode** set to **Env Learn (Survey)**, you can now perform a network design in the **Simulation** view using the site survey results as the basis for the simulation.