geCheck: geCheck
In fieldRS: Remote Sensing Field Work Tools

Description Usage Arguments Details Value See Also Examples

Finds overlaps between polygons in the same shapefile.

1	geCheck(x)

`x`	An object of class SpatialPolygons or SpatialPolygonsDataFrame.

compares all elements of x and returns a a list containing:

overlap.df - data.frame where each row shows the indices of which two polygons overlap.
overlap.shp - SpatialPointsDataFrame with the actual overlap for each row in overlap.df.

A list.

spCentroid ecDistance

{

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
co <- geCheck(p)

# show distance matrix
plot(p)
plot(co$overlap.shp, col="red", add=TRUE)

}