You can intersect SpatVectors with each other or with a SpatExtent. Intersecting points with points uses the extent of
y to get the intersection. Intersecting of points and lines is not supported because of numerical inaccuracies with that. You can use
buffer, to create polygons from lines and use these with intersect.
You can also intersect two SpatExtents.
When intersecting two SpatRasters these need to be aligned (have the same origin and spatial resolution). The values of the returned SpatRaster are
TRUE where both input rasters have values,
FALSE where one has values, and
NA in all other cells.
When intersecting a SpatExtent and a SpatRaster, the SpatExtent is first aligned to the raster cell boundaries.
crop for the intersection of a SpatRaster with a SpatExtent (or the extent of a SpatRaster or SpatVector) if you want a SpatRaster (not a SpatExtent) as output.
# S4 method for SpatVector,SpatVector intersect(x, y) # S4 method for SpatVector,SpatExtent intersect(x, y) # S4 method for SpatExtent,SpatVector intersect(x, y) # S4 method for SpatExtent,SpatExtent intersect(x, y) # S4 method for SpatRaster,SpatRaster intersect(x, y) # S4 method for SpatRaster,SpatExtent intersect(x, y) # S4 method for SpatExtent,SpatRaster intersect(x, y)
e1 <- ext(-10, 10, -20, 20) e2 <- ext(0, 20, -40, 5) intersect(e1, e2) #> SpatExtent : 0, 10, -20, 5 (xmin, xmax, ymin, ymax) f <- system.file("ex/lux.shp", package="terra") v <- vect(f) e <- ext(5.6, 6, 49.55, 49.7) x <- intersect(v, e) p <- vect(c("POLYGON ((5.8 49.8, 6 49.9, 6.15 49.8, 6 49.6, 5.8 49.8))", "POLYGON ((6.3 49.9, 6.2 49.7, 6.3 49.6, 6.5 49.8, 6.3 49.9))"), crs=crs(v)) values(p) <- data.frame(pid=1:2, area=expanse(p)) y <- intersect(v, p) r <- s <- rast(ncol=5, nrow=5, xmin=1, xmax=5, ymin=1, ymax=5) r[5:20] <- 5:20 s[11:20] <- 11:20 rs <- intersect(r, s) u <- shift(r, .8) us <- intersect(u, s)