Calculates and returns an overlay of points for the current map.

generate_point_overlay(
  geometry,
  extent,
  heightmap = NULL,
  width = NA,
  height = NA,
  pch = 20,
  color = "black",
  size = 1,
  offset = c(0, 0),
  data_column_width = NULL
)

Arguments

geometry

An `sf` object with POINT geometry.

extent

A `raster::Extent` object with the bounding box for the height map used to generate the original map.

heightmap

Default `NULL`. The original height map. Pass this in to extract the dimensions of the resulting overlay automatically.

width

Default `NA`. Width of the resulting overlay. Default the same dimensions as height map.

height

Default `NA`. Width of the resulting overlay. Default the same dimensions as height map.

pch

Default `20`, solid. Point symbol. `0` = square, `1` = circle, `2` = triangle point up, `3` = plus, `4` = cross, `5` = diamond, `6` = triangle point down, `7` = square cross, `8` = star, `9` = diamond plus, `10` = circle plus, `11` = triangles up and down, `12` = square plus, `13` = circle cross, `14` = square and triangle down, `15` = filled square, `16` = filled circle, `17` = filled triangle point-up, `18` = filled diamond, `19` = solid circle, `20` = bullet (smaller circle), `21` = filled circle blue, `22` = filled square blue, `23` = filled diamond blue, `24` = filled triangle point-up blue, `25` = filled triangle point down blue

color

Default `black`. Color of the points.

size

Default `1`. Point size.

offset

Default `c(0,0)`. Horizontal and vertical offset to apply to the polygon, in units of `geometry`.

data_column_width

Default `NULL`. The numeric column to map the width to. The maximum width will be the value specified in `linewidth`.

Value

Semi-transparent overlay with contours.

Examples

#Add the included `sf` object with roads to the montereybay dataset
# \donttest{
if(all(length(find.package("sf", quiet = TRUE)) > 0, 
      length(find.package("magick", quiet = TRUE)) > 0)) {
 monterey_city = sf::st_sfc(sf::st_point(c(-121.893611, 36.603056)))
 montereybay %>% 
   height_shade() %>%
   add_overlay(generate_point_overlay(monterey_city, color="red", size=12, 
                                   attr(montereybay,"extent"), heightmap = montereybay))  %>%
   add_shadow(ray_shade(montereybay,zscale=50),0.3) %>%
   plot_map()
 
}

# }