checkOverlap: checkOverlap
In fieldRS: Remote Sensing Field Work Tools

Description Usage Arguments Details Value Examples

Reports on how much two spatial objects overlap.

1	checkOverlap(x, y)

`x`	A spatial object.
`y`	A spatial object.

Uses intersect to report on the percentage of the area of x and y that coincides with their common spatial overlap.

A two element numeric vector.

{

 require(raster)
 
 # build polygons
 df1 <- data.frame(x=c(1, 5, 10, 2, 1), y=c(10, 9, 8, 7, 10))
 df2 <- data.frame(x=c(2, 6, 5, 4, 2), y=c(10, 9, 7, 4, 10))
 p <- list(Polygons(list(Polygon(df1)), ID=1), 
 Polygons(list(Polygon(df2)), ID=2))
 p <- SpatialPolygons(p)

 # check overlap %
 checkOverlap(p[1,], p[2,])

}