# Low density areas

Areas where a lower density of Wildfire Sensors are expected. They are usually areas of low (or lower) human activity or even no human activity. For example, they can be areas off-limits to human activity, remote areas or forested areas that may have pathways running through them.

<figure><img src="/files/Suz4UHqGwHmF403kpgNL" alt="" width="563"><figcaption><p>Area defined</p></figcaption></figure>

## Draw an area

1. **Start area:**\
   Start creating a new area by clicking on the map where you want the area to start and continue drawing the outline of the area.
2. **End area:**\
   End the area by double-clicking on the map where you want the area to end.
3. **Add settings:**\
   See [Area settings](/dryad-documentation/site-planning/coverage-estimation.md#area-settings) below.
4. Save the project.

## Area Settings

Select an area to access the **Area Settings** panel.

* **Name:**\
  Give the area a descriptive name.
* **Surface covered:**\
  Automatically generated.
* **Accessible:**\
  The slider defines the area as accessible or inaccessible. Making the area inaccessible prevents any sensors or gateways placed in this area. For example, it can be used to indicate areas which are physically or legally not accessible for your deployment.
* **Protection Level:**\
  Default settings is Mid level (200 m between sensors). Use the slider to adjust sensor density. Low density is 500 m between each sensor, while high density is 100 m between each sensor.
* **Distance between sensors:**\
  Setting is based on the Protection Level slider. It can be set manually.

## Edit areas

After making an area, you can alter the dimensions of the area through the use of the perimeter dots.

Two types of dots make up the perimeter:

* **White dots**:\
  Key points in the perimeter that can be moved to change the dimensions of the area. They can be deleted to reduce the area dimension.
* **Yellow dots**:\
  Mid-points between white dots. Selecting a yellow dot converts them into white dots which adds other mid-point yellow dots.

<figure><img src="/files/mhRsb8DYm295tjUuntO5" alt="" width="563"><figcaption><p>Edit an area</p></figcaption></figure>

{% hint style="danger" %}
Expanding the Area moves the sensors as well. It may also add sensors to accommodate the increased size of the area. Ensure the sensors are placed correctly (not over structures, in open spaces, etc.).
{% endhint %}

**Access Edit Path panel**

* Select an area from the list of paths to open the **Edit Path** panel.

**Global changes**

1. Change global settings using the **Global Coverage** tab:
   * **Name**:\
     Update the area name.
   * **Accessible slider**:\
     When selected, it removes all Sensor icons as no Sensors can be deployed in the area.
   * **Protection level**:\
     Modify the Protection level using the slider or manually change the distance between Wildfire Sensors and amount of Sensors.
2. Save the project.

**Modify areas**

1. Select the Pencil icon to make the area editiable:
   1. **Change area perimeter**:\
      Select a a white dot, then drag it to add an angle to the perimeter. New midpoints are also created.
   2. **Delete an angle in the perimeter**:\
      Select a white dot, then press **Delete** or **Backspace** to remove the angle.
   3. **Delete a dot**:\
      Select a dot, then press **Delete** or **Backspace** to remove the dot.
   4. **Delete an area**:\
      Select the **Trash** icon to delete a area.
2. Click anywhere on the map to deselect the area.
3. Save the project.

**Add a Sensor to an area**

1. Select the **Manual Planning** tab.
2. Select **Add Sensor**.
3. Drop the **Sensor icon** in a new location within the boundaries of the area.
4. Save the project.


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