windfarmGA (version 3.0.0)

viewTo: Calculate Visibility between multiple locations

Description

Check if a location is visible from multiple locations

Usage

viewTo(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 vector, indicating if xy1 is visible from all elements of xy2

See Also

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

Examples

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

matrix <- matrix(abs(rnorm(20, mean = 10, sd = 5)), nrow=5)
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)))

viewTo(r1, sample_xy[4,], sample_xy, h1=1.8, h2=3, min(raster::res(r1)),
       plot=TRUE, interpolate=TRUE, asp=0.5)
# }