FedData (version 2.4.0)

get_ned: Download and crop the 1 (~30 meter) or 1/3 (~10 meter) arc-second National Elevation Dataset.

Description

get_ned returns a RasterLayer of elevation data cropped to a given template study area.

Usage

get_ned(template, label, res = "1", raw.dir = "./RAW/NED/", extraction.dir = paste0("./EXTRACTIONS/", label, "/NED/"), force.redo = F)

Arguments

template

A Raster* or Spatial* object to serve as a template for cropping.

label

A character string naming the study area.

res

A character string representing the desired resolution of the NED. '1' indicates the 1 arc-second NED (the default), while '13' indicates the 1/3 arc-second dataset.

raw.dir

A character string indicating where raw downloaded files should be put. The directory will be created if missing. Defaults to './RAW/NED/'.

extraction.dir

A character string indicating where the extracted and cropped DEM should be put. The directory will be created if missing. Defaults to './EXTRACTIONS/NED/'.

force.redo

If an extraction for this template and label already exists, should a new one be created?

Value

A RasterLayer DEM cropped to the extent of the template.

Examples

## Not run: 
# # Extract data for the Village Ecodynamics Project 'VEPIIN' study area:
# # http://village.anth.wsu.edu
# vepPolygon <- polygon_from_extent(raster::extent(672800,740000,4102000,4170000), 
#      proj4string='+proj=utm +datum=NAD83 +zone=12')
# 
# # Get the NED (USA ONLY)
# # Returns a raster
# NED <- get_ned(template=vepPolygon, label='VEPIIN')
# 
# # Plot with raster::plot
# plot(NED)
# ## End(Not run)