getDEM {hydflood} | R Documentation |
This function downloads and patches the tiled digital elevation models (dem) along the German federal waterways Elbe and Rhine that have been published on pangaea.de.
getDEM(filename = "", ext, crs, ...)
filename |
supplies an optional in- and output filename and has to be
type |
ext |
argument of type |
crs |
argument of type |
... |
additional arguments as for |
Since the underlying tiled digital elevation models (dem) are rather
large datasets hydflood provides options to permanentely cache these
datasets. options("hydflood.datadir" = tempdir())
is the default. To
modify the location of your raster cache to your needs set the respective
options()
prior to loading the package, e.g.
options("hydflood.datadir" = "~/.hydflood");library(hydflood)
. The
location can also be determined through the environmental variable
hydflood_datadir.
Since downloads of large individual datasets might cause timeouts, it is
recommended to increase options("timeout")
.
SpatRaster
object containing elevation data for the selected
floodplain region.
Weber A (2020). “Digital elevation models of German waterway and navigation authorities - Version 0.1.0.” https://doi.org/10.5675/BfG-2011.
Weber A (2020). “Digital elevation model (DEM1) of the River Elbe floodplain between Schmilka and Geesthacht, Germany.” https://doi.org/10.1594/PANGAEA.919293.
Weber A (2020). “Digital elevation model (DEM1) of the River Rhine floodplain between Iffezheim and Kleve, Germany.” https://doi.org/10.1594/PANGAEA.919308.
options("hydflood.datadir" = tempdir())
options("timeout" = 120)
library(hydflood)
dem <- getDEM(ext = ext(c(309000, 310000, 5749000, 5750000)),
crs = st_crs("EPSG:25833"))