clipLevel2BVPMGeometry: Clip GEDI Canopy Cover and Vertical Profile Metrics by...

In rGEDI: NASA's Global Ecosystem Dynamics Investigation (GEDI) Data Visualization and Processing

Description

This function clips GEDI level2B derived Canopy Cover and Vertical Profile metrics within a given geometry

Usage

clipLevel2BVPMGeometry(level2BVPM, polygon_spdf, split_by)

Arguments

level2BVPM	A GEDI Level2B object (output of readLevel1B function). An S4 object of class "gedi.level2b".
polygon_spdf	Polygon. An object of class SpatialPolygonsDataFrame-class, which can be loaded as an ESRI shapefile using raster::shapefile() function in the raster package.
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 an S4 object of class data.table-class containing the Canopy Cover and Vertical Profile metrics.

See Also

https://lpdaac.usgs.gov/products/gedi02_bv001/

Examples

# Specifying the path to GEDI level2B data (zip file)
outdir = tempdir()
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)

# Extracting canopy cover and vertical profile metrics
level2BVPM<-getLevel2BVPM(level2b)

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

# Reading shapefile as SpatialPolygonsDataFrame object
library(raster)
polygon_spdf<-shapefile(polygon_filepath)

# Clipping level2BVPM by geometry
level2b_clip_geometry <- clipLevel2BVPMGeometry(level2BVPM,polygon_spdf,split_by="id")

hasLeaflet = require(leaflet)

if (hasLeaflet) {
leaflet() %>%
 addCircleMarkers(level2b_clip_geometry$longitude_bin0,
                  level2b_clip_geometry$latitude_bin0,
                  radius = 1,
                  opacity = 1,
                  color = "red")  %>%
 addScaleBar(options = list(imperial = FALSE)) %>%
 addPolygons(data=polygon_spdf,weight=1,col = 'white',
             opacity = 1, fillOpacity = 0) %>%
 addProviderTiles(providers$Esri.WorldImagery)
}

close(level2b)

rGEDI documentation built on Jan. 19, 2021, 3:01 p.m.