Add elevation data to a previously-extracted OSM data set, using a
pre-downloaded global elevation file from
https://srtm.csi.cgiar.org/srtmdata/. Currently only works for
SC-class objects returned from osmdata_sc.
osm_elevation(dat, elev_file)An SC object produced by osmdata_sc.
A vector of one or more character strings specifying paths
to .tif files containing global elevation data.
A modified version of the input dat with an additional z_ column
appended to the vertices.
Other transform:
osm_poly2line(),
trim_osmdata(),
unique_osmdata(),
unname_osmdata_sf()