This function unions all polygons in a layer into a single geometry. The result is added as a source to the map, which can then be styled using add_fill_layer(), etc.
Arguments
- map
A mapboxgl, maplibre, mapboxgl_proxy, or maplibre_proxy object.
- layer_id
The ID of a layer or source to union (mutually exclusive with data).
- data
An sf object to union (mutually exclusive with layer_id).
- source_id
The ID for the new source containing the union result. Required.
- input_id
Optional. Character string specifying the Shiny input ID suffix for storing results. If NULL (default), no input is registered. For proxy operations, the result will be available as
input[[paste0(map_id, "_turf_", input_id)]].