plot_scatter: Extract values from a raster to produce a scatterplot

In shinyscholar: A Template for Creating Reproducible 'shiny' Applications

Extract values from a raster to produce a scatterplot

Description

Called by the plot_scatter module in the example app and samples values from a raster along with either the x or y coordinates of the points sampled

Usage

plot_scatter(raster, sample, axis, name, logger = NULL)

Arguments

raster	SpatRaster. Raster to be sampled
sample	numeric. Number of points to sample
axis	character. Which axis coordinates of the raster to return
name	character. The name of the raster variable
logger	Stores all notification messages to be displayed in the Log Window. Insert the logger reactive list here for running in shiny, otherwise leave the default NULL

Value

a function that generates a scatterplot

Author(s)

Simon Smart [e-mail]

Examples

if (check_suggests(example = TRUE)) {
  raster <- terra::rast(ncol = 8, nrow = 8)
  raster[] <- sapply(1:terra::ncell(raster), function(x){
     rnorm(1, ifelse(x %% 8 != 0, x %% 8, 8), 3)})
  scatterplot <- plot_scatter(raster, sample = 10, axis = "Longitude", name = "Example")
  scatterplot()
} else {
  message('reinstall with install.packages("shinyscholar", dependencies = TRUE)
  to run this example')
}

shinyscholar documentation built on Sept. 9, 2025, 5:52 p.m.