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