delineate_valley {rcrisp} | R Documentation |
Extract the river valley from the DEM
Description
The slope of the digital elevation model (DEM) is used as friction (cost) surface to compute the cost distance from any grid cell of the raster to the river. A characteristic value (default: the mean) of the cost distance distribution in a region surrounding the river (default: a buffer region of 2 km) is then calculated, and used to threshold the cost-distance surface. The resulting area is then "polygonized" to obtain the valley boundary as a simple feature geometry.
Usage
delineate_valley(dem, river)
Arguments
dem |
Digital elevation model of the region |
river |
A simple feature geometry representing the river |
Value
River valley as a simple feature geometry
Examples
bucharest_osm <- get_osm_example_data()
bucharest_dem <- get_dem_example_data()
delineate_valley(bucharest_dem, bucharest_osm$river_centerline)
[Package rcrisp version 0.1.4 Index]