clipLevel2BGeometry: Clip GEDI Level2B data by geometry

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

Clip GEDI Level2B data by geometry

Description

This function extracts GEDI Level1B data within a given geometry

Usage

clipLevel2BGeometry(level2b, polygon, output = "", split_by = NULL)

Arguments

level2b	A GEDI Level2B object (output of readLevel2B() function). An S4 object of class "gedi.level2b".
polygon	Polygon. An object of class sf::sf, which can be loaded as an ESRI shapefile using sf::st_read function in the sf package.
output	optional character path where to save the new h5file. Default "" (temporary file).
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 objects of class "gedi.level2b" containing clipped GEDI Level2B data.

See Also

https://lpdaac.usgs.gov/products/gedi01_bv002/

Examples

outdir <- tempdir()

# Specifying the path to GEDI level2B data (zip file)
level2B_fp_zip <- system.file("extdata",
  "GEDI02_B_2019108080338_O01964_T05337_02_001_01_sub.zip",
  package = "rGEDI"
)

# Unzipping GEDI level2A data
level2Bpath <- unzip(level2B_fp_zip, exdir = outdir)

# Reading GEDI level2B data (h5 file)
level2b <- readLevel2B(level2Bpath = level2Bpath)

# 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)

# Specifying output file and path
output <- file.path(outdir, "GEDI02_B_2019108080338_O01964_T05337_02_001_01_clip")

# Clipping GEDI data by extent boundary box
level2b_clip <- clipLevel2BGeometry(level2b,
  polygon = polygon,
  output = output,
  split_by = "id"
)

close(level2b)
lapply(level2b_clip, close)

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