library(geojsonio)
library(sf)
us_cities_sf <- st_as_sf(us_cities, coords = c("long", "lat"), crs = 4326)
us_cities_sf$marker <- ifelse(us_cities_sf$capital > 0, "marker2", "marker1")
xy <- st_bbox(us_cities_sf) %>%
st_as_sfc() %>%
st_centroid() %>%
st_coordinates() %>%
as.vector()
icon_mapping <- list(
marker1 = use_icon_definition(), # default mapping
marker2 = use_icon_definition(x = 128, mask = FALSE) # use second icon on the default atlas image
)
deckgl(longitude = xy[1], latitude = xy[2], zoom = 3) %>%
add_icon_layer(
data = us_cities_sf,
iconMapping = icon_mapping,
getIcon = JS("d => d.marker"),
getPosition = ~geometry,
pickable = TRUE,
getSize = 3.5,
sizeScale = 15,
getTooltip = ~name
) %>%
add_basemap()
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