ggRasterly: ggRasterly

In rasterly: Easily and Rapidly Generate Raster Image Data with Support for 'Plotly.js'

Description

Display large data set in ggplot.

Usage

ggRasterly(
  data = NULL,
  mapping = aes(),
  ...,
  plot_width = 600,
  plot_height = 600,
  x_range = NULL,
  y_range = NULL,
  background = "white",
  color = NULL,
  show_raster = TRUE,
  drop_data = FALSE,
  variable_check = FALSE,
  alpha = 0.5,
  shape = 15,
  point_size = 0.5
)

Arguments

data	Dataset to use for generating the plot. If not provided, data must be supplied in each layer of the plot. For best performance, particularly when processing large datasets, use of data.table is recommended.
mapping	Default list of aesthetic mappings to use for plot. The same with ggplot2 aes. See details.
...	Other arguments which will be passed through to layers.
plot_width	Integer. The width of the image to plot; must be a positive integer. A higher value indicates a higher resolution.
plot_height	Integer. The height of the image to plot; must be a positive integer. A higher value indicates a higher resolution.
x_range	Vector of type numeric. The range of x; it can be used to clip the image. For larger datasets, providing x_range may result in improved performance.
y_range	Vector of type numeric. The range of y; it can be used to clip the image. For larger datasets, providing y_range may result in improved performance.
background	Character. The background color of the image to plot.
color	Vector of type character. It will determine this color vector is a color_map or color_key automatically. color_map: It has Color(s) used to draw each pixel. The color_map is extended by linear interpolation independently for RGB. The darkness of the mapped color depends upon the values of the aggregation matrix. color_key: Vector of type character. The color_key is used for categorical variables; it is passed when the color aesthetic is provided.
show_raster	Logical. Should the raster be displayed?
drop_data	Logical. When working with large datasets, drops the original data once processed according to the provided aes() parameters, using the remove() function. See details for additional information.
variable_check	Logical. If TRUE, drops unused columns to save memory; may result in reduced performance.
alpha	The transparency of points, from 0 to 1.
shape	The shape of points, see pch.
point_size	The size of points.

Value

a 'ggplot' object

See Also

plotRasterly, plot.rasterly

Examples

## Not run: 
if(requireNamespace("ggplot2") && requireNamespace("data.table") && 
  requireNamespace("lubridate")) {
 # Load data
 url1 <- "https://raw.githubusercontent.com/plotly/datasets/master/uber-rides-data1.csv"
 ridesRaw_1 <-  url1 %>%
   data.table::fread(stringsAsFactors = FALSE)
 url2 <- "https://raw.githubusercontent.com/plotly/datasets/master/uber-rides-data2.csv"
 ridesRaw_2 <-  url2 %>%
   data.table::fread(stringsAsFactors = FALSE)
 url3 <- "https://raw.githubusercontent.com/plotly/datasets/master/uber-rides-data3.csv"
 ridesRaw_3 <-  url3 %>%
   data.table::fread(stringsAsFactors = FALSE) 
   
 ridesDf <- list(ridesRaw_1, ridesRaw_2, ridesRaw_3) %>%
   data.table::rbindlist()
   
 time <- lubridate::ymd_hms(ridesDf$`Date/Time`)
 ridesDf <-  ridesDf[, 'Date/Time':=NULL][, list(Lat,
                                                 Lon,
                                                 hour = lubridate::hour(time),
                                                 month = lubridate::month(time),
                                                 day = lubridate::day(time))]
                                                 
 # continuous variable legend
 ggRasterly(data = ridesDf, 
            mapping = aes(x = Lat, y = Lon),
            color = fire_map
 )
 # discreate variable legend
 ggRasterly(data = ridesDf, 
            mapping = aes(x = Lat, y = Lon, color = hour),
            color = hourColors_map
 ) + 
 ggplot2::labs(title = "New York Uber",
               subtitle = "Apr to Sept, 2014",
               caption = 
                 "https://raw.githubusercontent.com/plotly/datasets/master")
 }

## End(Not run)

rasterly documentation built on July 2, 2020, 2:12 a.m.