Generate Point Overlay
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 )
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'. |
Semi-transparent overlay with contours.
#Add the included `sf` object with roads to the montereybay dataset
if(all(c("sf","magick") %in% rownames(utils::installed.packages()))) {
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()
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.