Extract coordinate values from geometries — g

g_coords() extracts coordinate values (vertices) from the input geometries and returns a data frame with coordinates as columns.

Usage

g_coords(geom)

Arguments

geom: Either a raw vector of WKB or list of raw vectors, or a character vector containing one or more WKT strings.

Value

A data frame as returned by wk::wk_coords(): columns feature_id (the index of the feature from the input), part_id (an arbitrary integer identifying the point, line, or polygon from whence it came), ring_id (an arbitrary integer identifying individual rings within polygons), and one column per coordinate (x, y, and/or z and/or m).

Examples

dsn <- system.file("extdata/ynp_fires_1984_2022.gpkg", package="gdalraster")
lyr <- new(GDALVector, dsn)
d <- lyr$fetch(10)

vertices <- g_coords(d$geom)
head(vertices)
#>   feature_id part_id ring_id        x         y
#> 1          1       2       1 503099.4 -12893.97
#> 2          1       2       1 503169.8 -12756.37
#> 3          1       2       1 502689.8 -12131.53
#> 4          1       2       1 503098.4 -11311.95
#> 5          1       2       1 503796.8 -11250.05
#> 6          1       2       1 503950.2 -11631.99

lyr$close()