How to plot map layer in shiny using leaflet?

jlacko · February 20, 2020, 6:46am

What you describe is a nice, if not exactly entry level, modeling and visualization exercise.

You will find the basics of shiny integration described on RStudio's Leaflet pages.

For an example of a (very simple) map app built in Shiny using the well known & much loved North Carolina shapefile that comes with {sf} consider this example; it is turned inside out compared to your use case (the map is for clicking and text is for displaying information) but it is a start...

Shiny: Using multiple exclusive reactiveValues for filtering dataset shiny

Well, if no public dataset is available - we will have to make do with our ingenuity, and the good ol' NC shapefile from {sf} package. It's a bird? It's a plane! It's the North Carolina shapefile!!! library(dplyr) library(shiny) library(leaflet) library(sf) # NC counties - a shapefile shipped with the sf package shape <- st_read(system.file("shape/nc.shp", package ="sf")) %>% st_transform(shape, crs = 4326) %>% mutate(widgets = 300) %>% # a column of fake data group_by(widgets) %>% summarize() # three cities - note the x and y coordinates points <- data.frame(name = c("Raleigh", "Greensboro", "Wilmington"), x = c(-78.633333, -79.819444, -77.912222…