lineLength: Line length
In SDraw: Spatially Balanced Samples of Spatial Objects

Description Usage Arguments Details Value Author(s) See Also Examples

An all-R routine that computes total length of all lines in a SpatialLines* object.

1	lineLength(x, byid = FALSE)

`x`	A spatial object inheriting from `SpatialLines`, `SpatialPolygons`, or `SpatialPoints`.
`byid`	Whether to return lengths of individual spatial objects (TRUE) or the sum of all length (FALSE).

Provides the same answer as rgeos::gLength, but is all-R (does not require rgeos Java library) and does not fire a warning if x is un-projected (i.e., lat-long).

If byid==TRUE, a vector containing the lengths of individual spatial objects (the points, lines, or polygons) is returned. If byid=FALSE, the total length of all spatial objects is returned (a single number).

If x inherits from SpatialPoints, returned value is 0. If x inherits from SpatialLines, returned value contains line lengths or the sum of line lengths in x. If x inherits from SpatialPolygons, returned value contains lengths of the perimeter of all polygons, or the sum of perimeters, in x. When x contains polygons with holes, the perimeter of the holes is included (i.e., perimeter of holes is positive, not negative).

Units of the returned value are same as units of coordinates in x. E.g., meters if coordinates in x are UTM meters, decimal degrees if coordinates in x are lat-long decimal degrees.

Trent McDonald

sp::SpatialLines-class