clipLevel1BGeometry: Clip GEDI Level1B data by geometry

In carlos-alberto-silva/rGEDI: NASA's Global Ecosystem Dynamics Investigation (GEDI) Data Visualization and Processing

Clip GEDI Level1B data by geometry

Description

This function clips GEDI Level1B (geolocated waveforms) data within a given bounding geometry

Usage

clipLevel1BGeometry(level1b, polygon, output = "", split_by = NULL)

Arguments

level1b	A gedi.level1b object (output of readLevel1B() function). An S4 object of class "gedi.level1b".
polygon	Polygon or Multipolygon. An object opened with sf::st_read,
output	Optional character path where to save the new hdf5r::H5File. The default stores a temporary file only.
split_by	Polygon id. If defined, GEDI data will be clipped by each polygon using the attribute specified by split_by from the attribute table.

Value

Returns a list of S4 object of class gedi.level1b containing clipped GEDI Level1B data.

Examples

outdir <- tempdir()

# Specifying the path to GEDI level1B data (zip file)
level1B_fp_zip <- system.file("extdata",
  "GEDI01_B_2019108080338_O01964_T05337_02_003_01_sub.zip",
  package = "rGEDI"
)

# Unzipping GEDI level1B data
level1Bpath <- unzip(level1B_fp_zip, exdir = outdir)

# Reading GEDI level1B data (h5 file)
level1b <- readLevel1B(level1Bpath = level1Bpath)

# Specifying the path to shapefile
polygon_filepath <- system.file("extdata", "stands_cerrado.shp", package = "rGEDI")

# Reading shapefile as sf object
library(sf)
polygon <- sf::st_read(polygon_filepath)

# Spepecifing output file and path
output <- file.path(outdir, "GEDI01_B_2019108080338_O01964_T05337_02_003_01_clip")

# clipping GEDI Level1B data by extent boundary box
level1b_clip <- clipLevel1BGeometry(level1b,
  polygon = polygon,
  output = output,
  split_by = "id"
)

close(level1b)
lapply(level1b_clip, close)

carlos-alberto-silva/rGEDI documentation built on Oct. 18, 2024, 4:46 a.m.