vapour_layer_extent: Read layer extent

In vapour: Access to the 'Geospatial Data Abstraction Library' ('GDAL')

Read layer extent

Description

Extent of all features in entire layer, possibly after execution of sql query and input extent filter.

Usage

vapour_layer_extent(dsource, layer = 0L, sql = "", extent = 0, ...)

Arguments

dsource	data source name (path to file, connection string, URL)
layer	integer of layer to work with, defaults to the first (0) or the name of the layer
sql	if not empty this is executed against the data source (layer will be ignored)
extent	optional extent (xmin,xmax,ymin,ymax)
...	unused

Value

vector of numeric values xmin,xmax,ymin,ymax

See Also

vapour_read_extent vapour_layer_info

Examples

file <- "list_locality_postcode_meander_valley.tab"
## A MapInfo TAB file with polygons
mvfile <- system.file(file.path("extdata/tab", file), package="vapour")
vapour_layer_extent(mvfile)

vapour documentation built on April 11, 2023, 5:59 p.m.