hipchain: hipchain

In crumplecup/muddier: Analystic Tools for Debris Flow Deposits in Montate Headwaters

Description

Given a matrix representation of the channel 'chan' with cols (x,y) and rows running upstream to downstream, pulls all pts within 'inc' of 'pt' along 'chan'. If 'us' is true, then the last row of the subset matrix is 'inc' units upstream If 'us' is false, then the first row of the subset is 'inc' units downstream The function recursively calls itself using the new point position and distance remaining in place of 'pt' and 'dist' until having fully traveled the original 'dist' by increments of 'inc'.

Usage

hipchain(pt, dist, inc = 10, chan = flowline, us = T, filter = 4000)

Arguments

pt	is a coordinate pair
dist	is a numeric hipchain distance (meters along channel)
inc	is a numeric step increment
chan	is a matrix of coords delineating channel from downstream to upstream
us	is a boolean indicating up or downstream travel
filter	is a numeric buffer distance defining off-channel pts

Value

coordinate position 'dist' along 'chan' from 'pt', and distance remaining in list

crumplecup/muddier documentation built on Aug. 18, 2021, 11:02 a.m.