Get Terrain Products — get_terrain • exploreRGEE

This function takes the USGS NED (National Elevation Dataset) or SRTM (Shuttle Radar Topography Mission) and gets a handful of terrain indices. This is good for downloaded areas for further analysis or passing on for some quick stats.

get_terrain(
  aoi,
  method = "NED",
  param = "slope",
  mask = FALSE,
  m.low = NULL,
  m.high = NULL,
  az = 270,
  el = 45
)

Arguments

aoi: A sf object indicating the extent of the geom.
method: character indicating what method to use, e.g. 'NED', 'SRTM'.
param: character indicating terrain type, e.g. 'dem', 'FA', 'TWI', 'TRI', 'TPI', 'aspect', 'slope', 'cos', 'sin', 'hillshade', 'complete'.
mask: logical whether to mask out certain ranges
m.low: numeric low value for mask, e.g. greater than 'm.low'
m.high: numeric high value for mask, e.g. less than 'm.high'
az: numeric The illumination azimuth in degrees from north.
el: numeric The illumination elevation in degrees.

Value

A list of Earth Engine Objects and arguments.

Examples

if (FALSE) {
# Load Libraries

library(rgee)
rgee::ee_intialize()
library(exploreRGEE)

# Bring in data
huc <- exploreRGEE::huc

# get terrain

twi <- get_terrain(huc, method = 'NED', param = 'TWI')
}