visual_magnitude {viewscape} | R Documentation |
visual_magnitude
Description
This function is still in progress. Visual Magnitude quantifies the extent of a visible region as perceived by an observer. It is derived from the surface's slope and angle features, alongside the observer's relative distance from the area (Chamberlain & Meitner).
Usage
visual_magnitude(viewshed, dsm)
Arguments
viewshed |
Viewshed object. |
dsm |
Raster, the digital surface / elevation model |
Value
SpatRaster
References
Chamberlain, B. C., & Meitner, M. J. (2013). A route-based visibility analysis for landscape management. Landscape and Urban Planning, 111, 13-24.
See Also
Examples
# Load a viewpoint
test_viewpoint <- sf::read_sf(system.file("test_viewpoint.shp", package = "viewscape"))
# load dsm raster
dsm <- terra::rast(system.file("test_dsm.tif", package ="viewscape"))
# Compute viewshed
viewshed <- viewscape::compute_viewshed(dsm = dsm,
viewpoints = test_viewpoint,
offset_viewpoint = 6)
# Compute visual magnitude
vm <- viewscape::visual_magnitude(viewshed, dsm)
[Package viewscape version 2.0.2 Index]