mapviewOptions: Global options for the mapview package

Description Usage Arguments Value Functions Author(s) See Also Examples

View source: R/options.R

Description

To permanently set any of these options, you can add them to <your R installation>/etc/Rprofile.site>. For example, to change the default number of pixels to be visualised for Raster* objects, add a line like this: options(mapviewMaxPixels = 700000) to that file.

Usage

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mapviewOptions(
  platform,
  basemaps,
  basemaps.color.shuffle,
  raster.palette,
  vector.palette,
  verbose,
  na.color,
  legend,
  legend.opacity,
  legend.pos,
  layers.control.pos,
  leafletWidth,
  leafletHeight,
  viewer.suppress,
  homebutton,
  homebutton.pos,
  native.crs,
  raster.size,
  mapview.maxpixels,
  plainview.maxpixels,
  use.layer.names,
  trim,
  method,
  query.type,
  query.digits,
  query.position,
  query.prefix,
  maxpoints,
  maxpolygons,
  maxlines,
  pane,
  cex,
  alpha,
  default = FALSE,
  console = TRUE,
  watch = FALSE,
  fgb,
  georaster
)

mapviewGetOption(param)

Arguments

platform

character. The rendering platform to be used. Current options are "leaflet" and "mapdeck".

basemaps

character. The basemaps to be used for rendering data. See https://leaflet-extras.github.io/leaflet-providers/preview/ for possible values

basemaps.color.shuffle

logical. Should basemaps order be changed to enhance contrast based on layer coloring. Set to FALSE if you supply custom basemaps or want to ensure that "CartoDB.Positron" is always the default.

raster.palette

a color palette function for raster visualisation. Should be a function that takes an integer as input and returns a vector of colors. See colorRampPalette for details.

vector.palette

a color palette function for vector visualisation. Should be a function that takes an integer as input and returns a vector of colors. See colorRampPalette for details.

verbose

logical. Many functions in mapview provide details about their behaviour. Set this to TRUE if you want to see these printed to the console.

na.color

character. The default color to be used for NA values.

legend

logical. Whether or not to show a legend for the layer(s).

legend.opacity

opacity of the legend.

legend.pos

Where should the legend be placed? One of "topleft", "topright", "bottomleft", "bottomright".

layers.control.pos

character. Where should the layer control be placed? One of "topleft", "topright", "bottomleft", "bottomright".

leafletWidth, leafletHeight

height and width of the htmlwidget in px.

viewer.suppress

whether to render the map in the browser (TRUE) or the RStudio viewer (FALSE).

homebutton

logical, whether to add a zoom-to-layer button to the map.

homebutton.pos

character. Where should the homebutton(s) be placed? One of "topleft", "topright", "bottomleft", "bottomright".

native.crs

logical whether to reproject to web map coordinate reference system (web mercator - epsg:3857) or render using native CRS of the supplied data (can also be NA). Default is FALSE which will render in web mercator. If set to TRUE now background maps will be drawn (but rendering may be much quicker as no reprojecting is necessary).

raster.size

numeric. see the maxBytes argument in addRasterImage

mapview.maxpixels

numeric. The maximum amount of pixels allowed for Raster* objects to be rendered with mapview. Defaults to 500000. Set this higher if you have a potent machine or are patient enough to wait a little.

plainview.maxpixels

numeric. The maximum amount of pixels allowed for Raster* objects to be rendered with plainview. Defaults to 10000000. Set this higher if you have a potent machine or are patient enough to wait a little.

use.layer.names

whether to use layer names when plotting raster layers.

trim

should the raster be trimmed in case there are NAs on the edges.

method

for raster data only (raster/stars). Method used to compute values for the resampled layer that is passed on to leaflet. mapview does projection on-the-fly to ensure correct display and therefore needs to know how to do this projection. The default is 'bilinear' (bilinear interpolation), which is appropriate for continuous variables. The other option, 'ngb' (nearest neighbor), is useful for categorical variables. Ignored if the raster layer is of class factor in which case "ngb" is used.

query.type

for raster methods only. Whether to show raster value query on 'mousemove' or 'click'. Ignored if label = FALSE.

query.digits

for raster methods only. The amount of digits to be shown by raster value query. Ignored if label = FALSE.

query.position

for raster methods only. The position of the raster value query info box. See position argument of addLegend for possible values. Ignored if label = FALSE.

query.prefix

for raster methods only. a character string to be shown as prefix for the layerId. Ignored if label = FALSE.

maxpoints

numeric. Maximum number of points allowed for leaflet overlay rendering. If this number is exceeded rendering will be done using special functionality which will provide much more speed and better handling. This means that standard functionality is reduced. For example adding layers via "+" is not possible anymore.

maxpolygons

numeric. Maximum number of polygons allowed for leaflet overlay rendering. If this number is exceeded rendering will be done using special functionality which will provide much more speed and better handling. This means that standard functionality is reduced. For example adding layers via "+" is not possible anymore.

maxlines

numeric. Maximum number of lines allowed for leaflet overlay rendering. If this number is exceeded rendering will be done using special functionality which will provide much more speed and better handling. This means that standard functionality is reduced. For example adding layers via "+" is not possible anymore.

pane

name of the map pane in which to render features. See addMapPane for details. Currently only supported for vector layers. Ignored if canvas = TRUE. The default "auto" will create different panes for points, lines and polygons such that points overlay lines overlay polygons. Set to NULL to get default leaflet behaviour where allfeatures are rendered in the same pane and layer order is determined automatically/sequentially.

cex

numeric or attribute name(s) or column number(s) in attribute table of the column(s) to be used for defining the size of circles.

alpha

opacity of lines.

default

logical. If TRUE all options are set to their default values

console

logical. Should the options be printed to the console

watch

whether to watch a certain environment and automatically render changes to the list of spatial data in that environment. See mapviewWatcher for details.

fgb

if set to TRUE mapview will not use 'clasical' leaflet/htmlwidgets rendering (which embeds data directly in the html) but leverage the speed of a file format called flatgeobuf (hence, fgb). This has the added benefit that data is being streamed onto the map, which makes for a pleasant user experience. It should also help to visualise larger data sets due to a reduced memeory footprint. A note of warning, data will be attached to the html via a <src=...> call which means that the html is not selfcontained anymore (so it cannot be used without an accompanying folder).

georaster

whether to use addGeoRaster instead of addRasterImage. If set to TRUE raster image visualisation will be more performant for large raster data, but given the nearest neighbor resampling results may be slightly distorted.

param

character. parameter(s) to be queried.

Value

list of the current options (invisibly). If no arguments are provided the options are printed.

Functions

Author(s)

Tim Appelhans

See Also

rasterOptions, options

Examples

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mapview documentation built on June 5, 2021, 5:07 p.m.