Add stars layer to a leaflet map

Usage

addStarsImage(
  map,
  x,
  band = 1,
  colors = "Spectral",
  opacity = 1,
  attribution = NULL,
  layerId = NULL,
  group = NULL,
  project = FALSE,
  method = c("auto", "bilinear", "near"),
  maxBytes = 4 * 1024 * 1024,
  options = gridOptions(),
  data = getMapData(map),
  ...
)

Arguments

map: a mapview or leaflet object.
x: a stars layer.
band: the band number to be plotted.
colors: the color palette (see colorNumeric) or function to use to color the raster values (hint: if providing a function, set na.color to "#00000000" to make NA areas transparent). The palette is ignored if x is a SpatRaster with a color table or if it has RGB channels.
opacity: the base opacity of the raster, expressed from 0 to 1
attribution: the HTML string to show as the attribution for this layer
layerId: the layer id
group: the name of the group this raster image should belong to (see the same parameter under addTiles)
project: if TRUE, automatically project x to the map projection expected by Leaflet (EPSG:3857); if FALSE, it's the caller's responsibility to ensure that x is already projected, and that extent(x) is expressed in WGS84 latitude/longitude coordinates
method: the method used for computing values of the new, projected raster image. "bilinear" (the default) is appropriate for continuous data, "ngb" - nearest neighbor - is appropriate for categorical data. Ignored if project = FALSE. See projectRaster for details.
maxBytes: the maximum number of bytes to allow for the projected image (before base64 encoding); defaults to 4MB.
options: a list of additional options, intended to be provided by a call to gridOptions
data: the data object from which the argument values are derived; by default, it is the data object provided to leaflet() initially, but can be overridden.
...: currently not used.

Details

This is an adaption of addRasterImage. See that documentation for details.

Examples

# \donttest{
library(stars)
library(leaflet)

tif = system.file("tif/L7_ETMs.tif", package = "stars")
x = read_stars(tif)
leaflet() %>%
  addProviderTiles("OpenStreetMap") %>%
  addStarsImage(x, project = TRUE)
#> Warning: no_data_value not set: missing values will appear as zero values
+−
Leaflet | © OpenStreetMap contributors
# }