View extent/bbox of spatial objects interactively

This function produces an interactive view of the extent/bbox of the supplied spatial object

Usage

viewExtent(
  x,
  map = NULL,
  popup = NULL,
  layer.name = NULL,
  alpha.regions = 0.2,
  label = NULL,
  ...
)

Arguments

x

either a Raster*, sf* or Spatial* object

map

a leaflet or mapview map the extent should be added to. If NULL standard background layers are created.

popup

a list of HTML strings with the popup contents, usually created from popupTable. See addControl for details.

layer.name

the name of the layer to be shown on the map.

alpha.regions

opacity of the fills or the raster layer(s).

label

a character vector of labels to be shown on mouseover. See addControl for details.

...

Arguments passed on to leaflet::addRectangles

layerId: the layer id
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
group: the name of the group the newly created layers should belong to (for clearGroup and addLayersControl purposes). Human-friendly group names are permitted–they need not be short, identifier-style names. Any number of layers and even different types of layers (e.g. markers and polygons) can share the same group name.
options: a list of extra options for tile layers, popups, paths (circles, rectangles, polygons, ...), or other map elements
popupOptions: A Vector of popupOptions to provide popups
labelOptions: A Vector of labelOptions to provide label options for each label. Default NULL
stroke: whether to draw stroke along the path (e.g. the borders of polygons or circles)
color: stroke color
weight: stroke width in pixels
opacity: stroke opacity (or layer opacity for tile layers)
fill: whether to fill the path with color (e.g. filling on polygons or circles)
fillColor: fill color
fillOpacity: fill opacity
dashArray: a string that defines the stroke dash pattern
highlightOptions: Options for highlighting the shape on mouse over.
smoothFactor: how much to simplify the polyline on each zoom level (more means better performance and less accurate representation)
noClip: whether to disable polyline clipping
lng1,lat1,lng2,lat2: latitudes and longitudes of the south-west and north-east corners of rectangles

Author

Tim Appelhans

Examples

library(leaflet)

viewExtent(breweries)
viewExtent(franconia) + breweries
mapview(franconia) %>% leafem::addExtent(franconia, fillColor = "yellow")

leaflet() %>% addProviderTiles("OpenStreetMap") %>% leafem::addExtent(breweries)

leaflet() %>% addProviderTiles("OpenStreetMap") %>% leafem::addExtent(breweries)