Get the area of individual polygons

Compute the area covered by polygons

Usage

# S4 method for class 'giottoPolygon'
area(x, ...)

# S4 method for class 'SpatVector'
area(x, ...)

Arguments

x

giottoPolygon

...

Arguments passed on to terra::expanse

Value

numeric vector of spatial area

Details

Giotto's methods do not hook into terra's area() generic. This is because area() in terra is deprecated in favor of expanse(). Additionally, Giotto suppresses warnings about unrecognized CRS, which are currently not as relevant for biological data.

Examples

sl <- GiottoData::loadSubObjectMini("spatLocsObj")
gpoly <- GiottoData::loadSubObjectMini("giottoPolygon")
gpoints <- GiottoData::loadSubObjectMini("giottoPoints")

# area of polygons
head(area(gpoly))
#> [1] 115.38216 137.69959  56.25879  40.22940  97.00258  45.33285

# area of the convex hull
area(hull(sl))
#> [1] 199333.6
feature_hulls <- hull(gpoints, by = "feat_ID")
head(area(feature_hulls))
#> [1] 144798.7 187046.0 188143.6 210427.2 180407.1 179525.7