Line layers are the 2D version of arc layers. Both draw a line between two points to represent distance, but, in a line layer, the line is drawn across the shortest distance between the two points.

An example of the Line Layer.

# Settings

The following section provides help for every setting in Line Layer.

## Basic

Contains basic settings required for Line Layer configuration.

You can draw lines in two ways -- creating a line from a set of source and destination points, or from a set of points and their neighbors.

| Setting | Description |
| --- | --- |
| Layer Type | Must be **Point** to display the line layer. |
| Dataset | Required. The dataset to use for the line layer. |
| Columns | Required. The columns to use for the line layer. |
| Columns: Points | Provide a pair of source/target latitude and longitudes columns, or Hex/H3 ID columns. Optionally, include an altitude column. |
| Columns: Point and Neighbors | Provide a latitude and longitude column for a point, then a `geo` column containing one or more neighbors. Optionally, include an altitude column. |

## Color

Color settings for the line.

| Setting | Description |
| --- | --- |
| Color Based On | The field to base the line color on. |
| Color Scale | The [color scale and palette](https://docs.foursquare.com/analytics-products/docs/layers-color-scale-and-palettes) for the line color. |
| Opacity | The opacity of the line color. 100 = fully opaque, 0 = fully transparent. |

## Stroke

Color settings for the stroke, or line width.

| Setting | Description |
| --- | --- |
| Stroke Slider | The stroke width (or range of stroke width when a field is selected for "Stroke Based On"). |
| Stroke Based On | The field to base the stroke width on. |
| Stroke Scale | The scaling of the stroke width. Choose from linear, sqrt, or log. |

## Elevation Scale

Elevation settings for the Line Layer. Requires an elevation column.

| Setting | Description |
| --- | --- |
| Elevation Scale | When an altitude is defined, a multiplier applied to emphasize elevation. |

# JSON Schema

For details on how to programmatically specify layer properties, refer to the [Layer Configuration](https://docs.foursquare.com/developer/docs/studio-layer-reference#line) specification.