Add stars/raster image to a leaflet map using optimised rendering.
Add stars/raster image to a leaflet map using optimised rendering.
addGeoRaster( map, x, group = NULL, layerId = NULL, resolution = 96, opacity = 0.8, options = leaflet::tileOptions(), colorOptions = colorOptions(), project = TRUE, pixelValuesToColorFn = NULL, ... )
map |
the map to add the raster data to. |
x |
the stars/raster object to be rendered. |
group |
he name of the group this raster image should belong to. |
layerId |
the layerId. |
resolution |
the target resolution for the simple nearest neighbor interpolation. Larger values will result in more detailed rendering, but may impact performance. Default is 96 (pixels). |
opacity |
opacity of the rendered layer. |
options |
options to be passed to the layer.
See |
colorOptions |
list defining the palette, breaks and na.color to be used. |
project |
whether to project the RasterLayer to conform with leaflets
expected crs. Defaults to |
pixelValuesToColorFn |
optional JS function to be passed to the browser. Can be used to fine tune and manipulate the color mapping. See https://github.com/r-spatial/leafem/issues/25 for some examples. |
... |
currently not used. |
This uses the leaflet plugin 'georaster-layer-for-leaflet' to render raster data.
See https://github.com/GeoTIFF/georaster-layer-for-leaflet for details.
The clue is that rendering uses simple nearest neighbor interpolation on-the-fly
to ensure smooth rendering. This enables handling of larger rasters than with
the standard addRasterImage.
A leaflet map object.
if (interactive()) {
library(leaflet)
library(leafem)
library(stars)
tif = system.file("tif/L7_ETMs.tif", package = "stars")
x1 = read_stars(tif)
x1 = x1[, , , 3] # band 3
leaflet() %>%
addTiles() %>%
leafem:::addGeoRaster(
x1
, opacity = 1
, colorOptions = colorOptions(
palette = grey.colors(256)
)
)
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.