get_nass_cdl: Download and crop the NASS Cropland Data Layer.

In bocinsky/FedData: Download Geospatial Data Available from Several Federated Data Sources

Download and crop the NASS Cropland Data Layer.

Description

get_nass_cdl returns a SpatRaster of NASS Cropland Data Layer cropped to a given template study area.

Usage

get_nass_cdl(
  template,
  label,
  year = 2019,
  extraction.dir = paste0(tempdir(), "/FedData/"),
  raster.options = c("COMPRESS=DEFLATE", "ZLEVEL=9", "INTERLEAVE=BAND"),
  force.redo = FALSE,
  progress = TRUE
)

get_nass(template, label, ...)

get_cdl(template, label, ...)

cdl_colors()

Arguments

template	An Simple Feature or SpatRaster object to serve as a template for cropping.
label	A character string naming the study area.
year	An integer representing the year of desired NASS Cropland Data Layer product. Acceptable values are 2007–the last year.
extraction.dir	A character string indicating where the extracted and cropped NASS data should be put. The directory will be created if missing.
raster.options	a vector of options for terra::writeRaster.
force.redo	If an extraction for this template and label already exists, should a new one be created?
progress	Draw a progress bar when downloading?
...	Other parameters passed on to get_nass_cdl.

Value

A SpatRaster cropped to the bounding box of the template.

Examples

## Not run: 
# Extract data for the Mesa Verde National Park:

# Get the NASS CDL (USA ONLY)
# Returns a raster
NASS <-
  get_nass_cdl(
    template = FedData::meve,
    label = "meve",
    year = 2011
  )

# Plot with terra::plot
terra::plot(NASS)

## End(Not run)

bocinsky/FedData documentation built on June 11, 2025, 2:42 a.m.