Symbolize an existing layer as a choropleth

Symbolize an existing layer as a choropleth

Usage

classify_layer(
  map,
  layer,
  column,
  class_count = 5,
  colormap = "viridis",
  scheme = c("equal-interval", "quantile")
)

Arguments

map

A GeoLibre widget.

layer

A layer id or layer name. The layer must carry inlined GeoJSON.

column

Name of the numeric feature property to classify.

class_count

Number of classes, clamped to between 2 and 12.

colormap

A color ramp name from color_ramp_names().

scheme

Classification scheme, "equal-interval" or "quantile".

Value

The modified widget.

See also

add_choropleth() to add and symbolize in one call.

Examples

counties <- list(
  type = "FeatureCollection",
  features = list(
    list(
      type = "Feature", properties = list(pop = 10),
      geometry = list(type = "Point", coordinates = c(-77, 39))
    ),
    list(
      type = "Feature", properties = list(pop = 90),
      geometry = list(type = "Point", coordinates = c(-76, 40))
    )
  )
)
map <- geolibre() |>
  add_geojson(counties, name = "Counties") |>
  classify_layer("Counties", "pop", colormap = "reds")
stopifnot(map$x$project$layers[[1]]$style$vectorStyleProperty == "pop")