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# Common

This page is intended for the description of *properties* that are used across area monitoring system.

## Common properties

### `scope`

The `scope` identifier primarily serves as a reference data differentiator. It can be:

* a country identifier ([ISO 3166-1 alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2)) + year of data (for example, `SI22`) or

* internal classifier (for example, `DEMO`), if the country scope is not applicable, that can be constructed of:

  * uppercase letters `[A-Z]` *(English alphabet only)*
  * numbers `[0-9]`
  * underscore `_`

## Common React props objects

### `geometry`

A `geometry` element is a *[GeoJSON](https://geojson.org/) object* (CRS: WGS84). Holes are allowed.

| Property        | Type     | Description                                                                                      |
| --------------- | -------- | ------------------------------------------------------------------------------------------------ |
| `type`\*        | `string` | The type of shape to be rendered. The supportive geometry types are `Polygon` or `MultiPolygon`. |
| `coordinates`\* | `array`  | The coordinates that set the position of the drawn shape’s outline.                              |

*\* indicates mandatory properties*

### `style`

A `style` element is an object that defines how [geometry](#geometry) will be displayed.

| Property        | Description                                                                                                                |
| --------------- | -------------------------------------------------------------------------------------------------------------------------- |
| `strokeColor`\* | The color (one of [CSS legal color values](https://www.w3schools.com/cssref/css_colors_legal.asp)) of the shape's outline. |
| `lineWidth`\*   | The width of the outline in pixels.                                                                                        |

*\* indicates mandatory properties*