windfarmGA (version 3.0.0)

cansee: Calculate Visibility between 2 locations

Description

Check if point 1 is visible from point 2 given a certain elevation model

Usage

cansee(r, xy1, xy2, h1 = 0, h2 = 0, reso, plot = FALSE, ...)

Arguments

r

A DEM raster

xy1

A vector/matrix with X and Y coordinates for Point 1

xy2

A vector/matrix with X and Y coordinates for Point 2

h1

A numeric giving the extra height offset for Point 1

h2

A numeric giving the extra height offset for Point 2

reso

The minimal resolution of the DEM raster. It is calculated in viewshed and passed along.

plot

Plot the process? Default is FALSE

...

Additional arguments passed to the raster plot

Value

A boolean value, indicating if the point (xy2) is visible

See Also

Other Viewshed Analysis: interpol_view(), plot_viewshed(), rasterprofile(), viewTo(), viewshed()

Examples

# NOT RUN {
library(raster)
library(sf)

matrix <- matrix(abs(sin(1:100))*10, nrow=10, byrow = TRUE)
r1 <- raster(matrix)
shape <- st_as_sf(as(extent(r1), "SpatialPolygons"))
locs = st_sample(shape, 10, type = "random");

mw <- methods::as(methods::as(r1, "SpatialPixelsDataFrame"), "SpatialPolygons")
sample_xy <- st_coordinates(st_centroid(st_as_sf(mw)))

Pt1 <- 3
for (i in 1:nrow(sample_xy)) {
  cansee(r1, 
         xy1 = st_coordinates(locs)[Pt1,], 
         xy2 = sample_xy[i,], 
         h1 = 3, 
         h2 = 1.5, 
         reso = min(res(r1)), 
         plot=TRUE)
  invisible(readline(prompt="Press [enter] to continue"))
}
# }