How do I create a leaflet map with thousands of marks that doesn't crash my browser?

leaflet js
good leaflet map examples
mapview r
leaflet marker

I'm using the leaflet package in R to generate a map with a large number of circles on it. The goal is a map I can publish to my website. The problem I'm having is that as I increase the number of circles, the resulting map loads very slowly, I get "unresponsive script" warnings and ultimately it completely freezes up my browser.

I know this sort of thing is possible, because I've found a leaflet map that works the way I want mine to work:

http://cartologic.com/geoapps/map_viewer/5/ny-crimes-2014-dot-density-map

I notice on the above map that the circles don't appear "clickable" like the circles on my map, and that they seem to load in square chunks. I have a hunch that these things are related to my problem. Unfortunately, I'm too much of a novice at leaflet/javascript stuff to figure this out on my own.

Here is a toy example illustrating my problem:

library("leaflet")
library("htmlwidgets")

dots <- data.frame(x=c(runif(10000, -93.701281, -93.533053)),
                   y=c(runif(10000,  41.515962,  41.644369)))

m <- leaflet(dots) %>%
  addTiles('http://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}.png') %>% 
  setView(-93.617167, 41.580166, zoom = 12) %>% 
  addCircles(~x, ~y, weight = 1, radius = 5, 
             color = "#FFA500", stroke = TRUE, fillOpacity = 0.1) 

m

saveWidget(widget = m, file="example.html", selfcontained = TRUE)

mapview can help you here. It builds upon the leaflet library for smaller data sets, but uses special javascript functionality for larger data.

your example with 1 Mio. points:

library(mapview)
library(sp)

dots <- data.frame(x=c(runif(1000000, -93.701281, -93.533053)),
                   y=c(runif(1000000,  41.515962,  41.644369)))

coordinates(dots) <- ~ x + y
proj4string(dots) <- "+init=epsg:4326"

mapview(dots)

It may still take a while to render, but once rendered it should be quite responsive. Note that mapview is designed to work with spatial* objects, that is why we need the calls to set the coordinate slot and the projection.

For more information have a look here:

http://environmentalinformatics-marburg.github.io/web-presentations/20150723_mapView.html

Hope that helps.

Markers With Custom Icons - Leaflet, To make a custom icon, we usually need two images — the actual icon image and the image of its Now putting a marker with this icon on a map is easy:. Set the map's view. A Leaflet map's view property is what manages what part of of the map you see. Set your map's view to center on the coordinates [0, 0] (off the coast of central Africa): Note: Unlike the OpenLayers mapping library, Leaflet deals with coordinates in the format [latitude, longitude].


If you want to add a large number of vector objects to a map, it is rare that it can be done easily.

Notice that the raster data is broken into tiles so that all the information does not have to be shown at one time. For your vector data (in this case, circles) you have to do the same thing.

Basically what I like to do is to break the large data set into smaller (vector) tiles, with the same boundaries as the raster tiles you are showing. Duplicate the data if you want it to appear at several zoom level. As you are showing circle, imagine that you partition the circles' center points on the tile boundary.

I have an application similar to this where I basically partition my vector data on tile boundaries and store the information in geojson files. When I get an event that the raster tile has been loaded I can then load the equivalent vector file as a geojson layer (same thing when the raster tile is unloaded). In this way, you can limit the amount of vector data that has to be displayed at any one time.

If you have a lot of points, they are not really going to be visible at low zoom levels anyway, so it might be better just to show them at an appropriate zoom level (perhaps with a different representation at low zooms - like a heat map). This will keep the amount of data being shown at any one time lower.

Read Leaflet Tips and Tricks, Make your map full screen; Importing external data into leaflet.js At the time of writing there are hundreds of separate plugins that allow features openPopup() portion the popup won't be open when your map loads, but if you click on I use is to paste it into the middle line there between the speech-marks and I'm done. Leaflet is a very powerful tool, and we can create a lot of different kinds of maps. This tutorial will help you understand how to create an advanced map along with the help of React and Vanilla JS. Grasping information from a CSV or a JSON file isn’t only complicated, but is also tedious.


Since this question has a few upvotes, I'll generally describe both of the solutions I found. Maybe if I have time later I'll get all the files together on GitHub.

First, I found TileMill. Simply load a data file of coordinates into TileMill, style the way you want them to appear, and output tiles (png). Host those tiles on the web somewhere and load them with leaflet. This process was a bit too manual for my liking because TileMill kept crashing when I loaded in csv files that were too large for it to render on my machine.

I found the best solution was use Processing, adapting Robert Manduca's code here: https://github.com/rmanduca/jobmaps. I don't use Python so I rewrote those parts in R and modified the Processing code according to my specifications.

Creating An Interactive Map With Leaflet and OpenStreetMap , set up a simple map using the Leaflet JavaScript library; load marker The problem is I need to mark the hospitals and important organization in my OSM map. I'm obviously using OSM here, but I'm not getting thousands of hits a It's possible your web server doesn't like the .json extension on that file. Create your own leaflet in minutes with beautiful, easy-to-customize designs that include photos and artwork. StockLayouts ready-made design templates provide an excellent starting point to help you make a leaflet. Our designers have created thousands of layouts that are artistic and tailored for a wide selection of businesses.


Mapdeck (released on CRAN Aug 2018) uses WebGL (through Deck.gl) and is designed to handle millions of points (depending on your system's hardware of course)

library(mapdeck)

set_token("MAPBOX_TOKEN")

n <- 1e6
dots <- data.frame(x=c(runif(n, -93.701281, -93.533053)),
                   y=c(runif(n,  41.515962,  41.644369)))


dots$letter <- sample(letters, size = n, replace = T)

mapdeck(
    style = mapdeck_style('dark')
) %>%
    add_scatterplot(
        data = dots
        , lon = "x"
        , lat = "y"
        , fill_colour = "letter"
        , radius = 5
        , fill_opacity = 50
        , layer_id = "dots"
    )

Leaflet for R, Use markers to call out points on the map. It lets you create a list of (named or unnamed) makeIcon() icons, and select from that list by position or name. Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps. Weighing just about 38 KB of JS, it has all the mapping features most developers ever need. Leaflet is designed with simplicity, performance and usability in mind.


Leaflet for R - Introduction, Compose maps using arbitrary combinations of: Map tiles; Markers; Polygons; Lines; Popups; GeoJSON. Create maps right from the R console or RStudio; Embed  Brochure printing made easy. We’ll make sure your brochures look as great in person as they do on your screen. Canva Print makes brochure printing pain-free. With affordable prices and a 100% satisfaction guarantee, we’re determined to print brochures that you’ll love. We deliver to your door within 3-5 days—or choose our Express option.


The World at War (eBook), Map. of. Europe. Europe 1919: A Map Study. Following the end of World War I, known Others, however, went to the meetings ready to create a new world, one better Hundreds of thousands of leaflets were dropped from airplanes into the amounting to 132 billion gold marks, including shipments of German coal and  You create a Leaflet map with these basic steps: Create a map widget by calling leaflet(). Add layers (i.e., features) to the map by using layer functions (e.g. addTiles, addMarkers, addPolygons) to modify the map widget. Repeat step 2 as desired. Print the map widget to display it. Here’s a basic example:


Leaflet Map – WordPress plugin, Can be set per map with shortcode attributes or through the dashboard settings. Maps. Simply create a map with: [leaflet-map]. Lookup an address with: [leaflet-  Folium is a powerful Python library that helps you create several types of Leaflet maps. The fact that the Folium results are interactive makes this library very useful for dashboard building. To get an idea, just zoom/click around on the next map to get an impression.