tidycensus

To update or populate a providers.json file with current provider information, you can access the providers object from the L.TileLayer.Provider.providers namespace and stringify it. This is useful for inspecting the available tile provider configurations.

var providers = L.TileLayer.Provider.providers;
JSON.stringify(providers, null, "  ");

Install tidycensus from CRAN using the standard R installation command. This package allows you to interface with US Census Bureau APIs and retrieve data in tidyverse-ready data frames, with optional support for spatial geometry via sf.

install.packages("tidycensus")

Leaflet-providers is an extension for Leaflet that provides configurations for various tile providers. You can add a tile layer to your map by passing a provider[.<variant>] string to the L.tileLayer.provider constructor. This returns a standard L.TileLayer instance.

// add Stamen Watercolor to map.
L.tileLayer.provider('Stamen.Watercolor').addTo(map);

Using tidycensus requires a free Census API key.

1. Obtain a key at: https://api.census.gov/data/key_signup.html
2. Register the key in your R session using census_api_key(). Setting install = TRUE will save the key to your .Renviron file so you don't have to provide it in every session.

library(tidycensus)
census_api_key("YOUR API KEY GOES HERE", install = TRUE)

You can install tidycensus from CRAN for the stable version, or from GitHub to access the latest updates.

To install the stable version from CRAN:

install.packages("tidycensus")

To install the latest development version from GitHub:

remotes::install_github("walkerke/tidycensus")

By default, Leaflet-providers attempts to use https:// if your web page is served over HTTPS and the provider supports it. If you need to force the use of http://, pass force_http: true in the options argument of the L.tileLayer.provider call.

L.tileLayer.provider('Provider.Name', {
    force_http: true
}).addTo(map);

To support retina displays, you can use a placeholder in the URL and provide a value in the options. If L.Browser.retina is true, the placeholder is replaced by your provided value; otherwise, it is replaced by an empty string.

1. In the URL pattern, add {retina} (e.g., -----{retina}.png).
2. In the options object, set retina to the desired suffix (e.g., '@2x').

To use HERE layers, you must register at the HERE developer portal to obtain an app_id and app_code. These must be passed in the options object.

L.tileLayer.provider('HERE.terrainDay', {
    app_id: '<insert ID here>',
    app_code: '<insert ID here>'
}).addTo(map);

To use Mapbox, you must register at Mapbox and obtain a map id and an accessToken from your Mapbox projects. Pass these via the options object.

L.tileLayer.provider('MapBox', {
    id: 'ID',
    accessToken: 'ACCESS_TOKEN'
}).addTo(map);

A full list of free-to-use tile layers (including OpenStreetMap, Stamen, Esri, and OpenWeatherMap) can be previewed online. The preview page provides the exact string to use with leaflet-providers.js and the code required to use them without dependencies.

http://leaflet-extras.github.io/leaflet-providers/preview/index.html