geophys (version 1.3-6)

dircheck: Check direction of polygon

Description

Check direction of polygon for Right Handed orietnation

Usage

dircheck(pol)

Arguments

pol

list of x,y

Value

• vector of signs

Details

Gets cross product of consecutive points in polygon and returns the sign of each. If most are positive, should try to reverse.

See Also

rev2RH, flipZEE

Examples

L=list()
L$x=c( 0.2188,-0.6668,-1.0992,-0.5105, 0.5106)
L$y=c( 0.76822, 0.75292,-0.01741,-0.74692,-0.48165)
dircheck(L)

K = rev2RH(L)
###  after reversing, 
dircheck(K)