Create a SpatVectorCollection
svc.RdMethods to create a SpatVectorCollection. This is an object to hold "sub-datasets", each a SpatVector, perhaps of different geometry type.
Usage
# S4 method for missing
svc(x)
# S4 method for SpatVector
svc(x, ...)
# S4 method for list
svc(x)
# S4 method for character
svc(x, layer="", query="", extent=NULL, filter=NULL)Arguments
- x
SpatVector, character (filename), list with SpatVectors, or missing
- ...
Additional
SpatVectors- layer
character. layer name to select a layer from a file (database) with multiple layers
- query
character. An query to subset the dataset in the OGR-SQL dialect
- extent
Spat* object. The extent of the object is used as a spatial filter to select the geometries to read. Ignored if
filteris notNULL- filter
SpatVector. Used as a spatial filter to select geometries to read (the convex hull is used for lines or points). It is guaranteed that all features that overlap with the extent of filter will be returned. It can happen that additional geometries are returned
Examples
f <- system.file("ex/lux.shp", package="terra")
v <- vect(f)
x <- svc()
x <- svc(v, v[1:3,], as.lines(v[3:5,]), as.points(v))
length(x)
#> [1] 4
x
#> class : SpatVectorCollection
#> length : 4
#> geometry : polygons (12)
#> polygons (3)
#> lines (3)
#> points (3983)
#> crs (first) : lon/lat WGS 84 (EPSG:4326)
#> names : , , ,
# extract
x[3]
#> class : SpatVector
#> geometry : lines
#> dimensions : 3, 6 (geometries, attributes)
#> extent : 5.74414, 6.239243, 49.69933, 50.03632 (xmin, xmax, ymin, ymax)
#> coord. ref. : lon/lat WGS 84 (EPSG:4326)
#> names : ID_1 NAME_1 ID_2 NAME_2 AREA POP
#> type : <num> <chr> <num> <chr> <num> <int>
#> values : 1 Diekirch 3 Redange 259 18664
#> 1 Diekirch 4 Vianden 76 5163
#> 1 Diekirch 5 Wiltz 263 16735
# replace
x[2] <- as.lines(v[1,])