Read layer extent — vapour_layer_extent • vapour

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

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)
#> [1]  412718.7  511687.5 5352612.8 5425154.3