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leaflet.opacity

General

leaflet.opacity extends the leaflet R package with the Leaflet.OpacityControls JavaScript plugin (LizardTech, 2013). It offers control buttons and a slider for adjusting the opacity of a layer.

Installation

You can install the released version of leaflet.opacity from CRAN with:

install.packages("leaflet.opacity")

or the latest version from GitHub with:

devtools::install_github("https://github.com/be-marc/leaflet.opacity", dependencies=TRUE)

Example

library(leaflet)
library(leaflet.opacity)
library(raster)

r <- raster(xmn = -2.8, xmx = -2.79, ymn = 54.04, ymx = 54.05, nrows = 30, ncols = 30)
values(r) <- matrix(1:900, nrow(r), ncol(r), byrow = TRUE)
crs(r) <- CRS("+init=epsg:4326")

leaflet() %>%
    addTiles() %>%
    addRasterImage(r, layerId = "raster") %>%
    addOpacitySlider(layerId = "raster")

Reference

LizardTech (2013). Leaflet.OpacityControls. Retrieved from https://github.com/lizardtechblog/Leaflet.OpacityControls