extent_vrt: Extents from VRT (virtual raster data set of GDAL)

In vaster: Tools for Raster Grid Logic

Extents from VRT (virtual raster data set of GDAL)

Description

Get extent from index values in VRT text, these are the individual footprints of raster windows in a VRT. These can be arbitrary to a specific grid, but generally are used for tiled mosaics.

Usage

extent_vrt(x)

Arguments

x	url or file path to VRT file

Details

Each VRT raster element records it's relative position within the grid, so we grid logic to expand the actual extent of each element, and return those as a matrix of xmin,xmax,ymin,ymax.

Value

a matrix of 4 columns, xmin,xmax,ymin,ymax

Examples

#src <- "https://opentopography.s3.sdsc.edu/raster/NASADEM/NASADEM_be.vrt"
src <- gzfile(system.file("extdata/NASADEM_be.vrt.gz", package = "vaster"), "rt")
## read VRT from a URL or file (we use a connection here to keep package example small)
ex <- extent_vrt(src)
close(src)
plot_extent(ex)

vaster documentation built on March 10, 2026, 5:08 p.m.