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

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Description

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

Usage

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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

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## 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)

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