mapviewOptions can be used to set several plotting parameters (arguments) globally, meaning that they will be valid for as long as the session is active.
A call to mapviewOptions() will show all options and their default values in the console
##
## global options:
##
## platform : leaflet
## basemaps : CartoDB.Positron CartoDB.DarkMatter OpenStreetMap Esri.WorldImagery OpenTopoMap
## basemaps.color.shuffle : TRUE
## raster.palette : function (n)
## vector.palette : function (n)
## verbose : FALSE
## na.color : #BEBEBE80
## legend : TRUE
## legend.opacity : 1
## legend.pos : topright
## layers.control.pos : topleft
## leafletWidth :
## leafletHeight :
## viewer.suppress : FALSE
## homebutton : TRUE
## homebutton.pos : bottomright
## native.crs : FALSE
## watch : FALSE
##
## raster data related options:
##
## raster.size : 8388608
## mapview.maxpixels : 5e+05
## plainview.maxpixels : 1e+07
## use.layer.names : FALSE
## trim : TRUE
## method : bilinear
## query.type : mousemove
## query.digits : 7
## query.position : topright
## query.prefix : Layer
## georaster : FALSE
##
## vector data related options:
##
## maxpolygons : 30000
## maxpoints : 20000
## maxlines : 30000
## pane : auto
## cex : 6
## alpha : 0.9
## fgb : FALSEIn detail, these are:
platform - the rendeing platform. At the moment, only leaflet is accepted but we are planning to implement more in the futurebasemaps - the default map.types used by mapview
raster.size - the maximum number of bytes to allow for the projected raster image rendering (before base64 encoding) -> default 8MBmapview.maxpixels - the maximum number of pixels to allow for raster image rendering on the map background -> default 500kplainview.maxpixels - the maximum number of pixels to allow for plain raster image rendering without the map background -> default 1 Millionmaxpolygons - the maximum number of polygons to allow for polygon rendering using standard leaflet (package) implementation. If an object has more features than this threshold, special canvas shader rendering is used. Note that this will result in less flexible rendering as many of the standard arguments will not be available (e.g. color mapping). -> default 30kmaxpoints - as for maxpolygons but for point features -> default 20kmaxlines - as for maxpolygons but for line features -> default 30kraster.palette - the default palette used for rendering raster images -> default hcl.colors(n, palette = "Inferno")
vector.palette - the default palette used for rendering vector features -> default hcl.colors(n, palette = "viridis")
verbose - whether to print more verbose information to the console during the rendering -> default FALSE
na.color - the color to be used for rendering NA values -> default #BEBEBE80
legend - whether to plot a legend -> default FALSE
legend.pos - where to position the legend if shown -> default topright
layers.control.pos - where to position the layers control on the map -> default topleft
leafletWidth, leafletHeight - the width and height of the map widget -> defaul NULL which means that the browser will be filled if possibleTo get the current value of a certain option use mapviewGetOption()
mapviewGetOption("basemaps")## [1] "CartoDB.Positron" "CartoDB.DarkMatter" "OpenStreetMap"
## [4] "Esri.WorldImagery" "OpenTopoMap"To set certain options use mapviewOptions()
mapviewOptions(basemaps = c("Esri.WorldShadedRelief", "OpenStreetMap.DE"),
raster.palette = grey.colors,
vector.palette = colorRampPalette(c("snow", "cornflowerblue", "grey10")),
na.color = "magenta",
layers.control.pos = "topright")##
## global options:
##
## platform : leaflet
## basemaps : Esri.WorldShadedRelief OpenStreetMap.DE
## basemaps.color.shuffle : TRUE
## raster.palette : function (n, start = 0.3, end = 0.9, gamma = 2.2, alpha, rev = FALSE)
## vector.palette : function (n)
## verbose : FALSE
## na.color : magenta
## legend : TRUE
## legend.opacity : 1
## legend.pos : topright
## layers.control.pos : topright
## leafletWidth :
## leafletHeight :
## viewer.suppress : FALSE
## homebutton : TRUE
## homebutton.pos : bottomright
## native.crs : FALSE
## watch : FALSE
##
## raster data related options:
##
## raster.size : 8388608
## mapview.maxpixels : 5e+05
## plainview.maxpixels : 1e+07
## use.layer.names : FALSE
## trim : TRUE
## method : bilinear
## query.type : mousemove
## query.digits : 7
## query.position : topright
## query.prefix : Layer
## georaster : FALSE
##
## vector data related options:
##
## maxpolygons : 30000
## maxpoints : 20000
## maxlines : 30000
## pane : auto
## cex : 6
## alpha : 0.9
## fgb : FALSE
mapview(breweries, zcol = "founded", legend = TRUE)## old-style crs object detected; please recreate object with a recent sf::st_crs()
## old-style crs object detected; please recreate object with a recent sf::st_crs()These options will now be available until the current session is closed. i.e. you quit R
## Warning in wkt(projfrom): CRS object has no comment## Warning in showSRID(uprojargs, format = "PROJ", multiline = "NO", prefer_proj =
## prefer_proj): Discarded ellps WGS 84 in Proj4 definition: +proj=merc +a=6378137
## +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null
## +wktext +no_defs +type=crs## Warning in showSRID(uprojargs, format = "PROJ", multiline = "NO", prefer_proj =
## prefer_proj): Discarded datum World Geodetic System 1984 in Proj4 definition## Warning in wkt(pfrom): CRS object has no comment## Warning in rgdal::rawTransform(projfrom, projto, nrow(xy), xy[, 1], xy[, : Using
## PROJ not WKT2 strings## Warning in wkt(pfrom): CRS object has no comment## Warning in rgdal::rawTransform(projfrom, projto, nrow(xy), xy[, 1], xy[, : Using
## PROJ not WKT2 strings## Warning in rgdal::rawTransform(projto_int, projfrom, nrow(xy), xy[, 1], : Using
## PROJ not WKT2 stringsTo change these options permanently, i.e. across sessions, you could place a call to mapviewOptions in your .Rprofile so that they will be set everytime you start R
To revert to factory settings use default = TRUE
mapviewOptions(default = TRUE)
mapview(franconia)## old-style crs object detected; please recreate object with a recent sf::st_crs()
## old-style crs object detected; please recreate object with a recent sf::st_crs()