add_heatmap_layer: Add a heatmap layer to a Mapbox GL map

In mapgl: Interactive Maps with 'Mapbox GL JS' and 'MapLibre GL JS'

Add a heatmap layer to a Mapbox GL map

Description

Add a heatmap layer to a Mapbox GL map

Usage

add_heatmap_layer(
  map,
  id,
  source,
  source_layer = NULL,
  heatmap_color = NULL,
  heatmap_intensity = NULL,
  heatmap_opacity = NULL,
  heatmap_radius = NULL,
  heatmap_weight = NULL,
  visibility = "visible",
  slot = NULL,
  min_zoom = NULL,
  max_zoom = NULL,
  before_id = NULL,
  filter = NULL
)

Arguments

map	A map object created by the mapboxgl function.
id	A unique ID for the layer.
source	The ID of the source, alternatively an sf object (which will be converted to a GeoJSON source) or a named list that specifies type and url for a remote source.
source_layer	The source layer (for vector sources).
heatmap_color	The color of the heatmap points.
heatmap_intensity	The intensity of the heatmap points.
heatmap_opacity	The opacity of the heatmap layer.
heatmap_radius	The radius of influence of each individual heatmap point.
heatmap_weight	The weight of each individual heatmap point.
visibility	Whether this layer is displayed.
slot	An optional slot for layer order.
min_zoom	The minimum zoom level for the layer.
max_zoom	The maximum zoom level for the layer.
before_id	The name of the layer that this layer appears "before", allowing you to insert layers below other layers in your basemap (e.g. labels).
filter	An optional filter expression to subset features in the layer.

Value

The modified map object with the new heatmap layer added.

Examples

## Not run: 
library(mapgl)

mapboxgl(
    style = mapbox_style("dark"),
    center = c(-120, 50),
    zoom = 2
) |>
    add_heatmap_layer(
        id = "earthquakes-heat",
        source = list(
            type = "geojson",
            data = "https://docs.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson"
        ),
        heatmap_weight = interpolate(
            column = "mag",
            values = c(0, 6),
            stops = c(0, 1)
        ),
        heatmap_intensity = interpolate(
            property = "zoom",
            values = c(0, 9),
            stops = c(1, 3)
        ),
        heatmap_color = interpolate(
            property = "heatmap-density",
            values = seq(0, 1, 0.2),
            stops = c(
                "rgba(33,102,172,0)", "rgb(103,169,207)",
                "rgb(209,229,240)", "rgb(253,219,199)",
                "rgb(239,138,98)", "rgb(178,24,43)"
            )
        ),
        heatmap_opacity = 0.7
    )

## End(Not run)

mapgl documentation built on Nov. 1, 2024, 5:08 p.m.