Arc Layer ​

Arc layers visualize connections between pairs of points on the map, making them ideal for displaying flows, routes, or relationships between locations. Common use cases include visualizing flight paths, trade flows, or migration patterns.

Adding an Arc Layer ​

1. In the Edit Map sidebar, navigate to "Map Layers"
2. Click "Add Map Layer"
3. Select "Arc Layer" as the layer type
4. Configure the data fields (see below)

Configuration ​

Required Fields ​

To create an arc layer, you need to specify both origin and destination coordinates:

• Origin Latitude Field: The field containing latitude values for the starting points
• Origin Longitude Field: The field containing longitude values for the starting points
• Destination Latitude Field: The field containing latitude values for the ending points
• Destination Longitude Field: The field containing longitude values for the ending points

Appearance Settings ​

Width Configuration ​

Arc width can be configured in two ways:

1. Static Width: Set a fixed width for all arcs

   • Width value (in meters or pixels)
   • Unit type (meters or pixels)
   • Minimum pixel width (prevents arcs from disappearing when zoomed out)

2. Data-Driven Width: Scale arc width based on a numeric field

   • Select a numeric field to determine width
   • Set a scale factor to multiply the field values
   • Choose unit type (meters or pixels)
   • Set minimum pixel width

Color Configuration ​

Arc colors can be configured in two ways:

1. Single Color: Apply one color to all arcs

   • Choose any color using the color picker
   • Set opacity level (0-100%)

2. Color Scheme: Color arcs based on data values

   • Select a field to determine colors
   • Choose a color scheme (e.g., "Oranges", "Blues")
   • For categorical fields:
     • Customize colors for each unique value
     • Control color assignments manually
   • For numeric fields:
     • Select number of color steps (3-9)
     • Choose interpolation type (value or quantile)
     • Option to reverse color scheme

Visibility Settings ​

• Toggle layer visibility
• Set zoom level range for visibility
  • Show/hide layer based on current zoom level
  • Useful for performance optimization