rescale_measures: Rescale reachcode measure to comid flowline measure

In nhdplusTools: NHDPlus Tools

Rescale reachcode measure to comid flowline measure

Description

Given a reachcode measure and the from and to measure for a comid flowline, returns the measure along the comid flowline. This is a utility specific to the NHDPlus data model where many comid flowlines make up a single reachcode / reach. "Measures" are typically referenced to reaches. Flowlines have a stated from-measure / to-measure. In some cases it is useful to rescale the measure such that it is relative only to the flowline.

from is downstream – 0 is the outlet to is upstream – 100 is the inlet

Usage

rescale_measures(measure, from, to)

Arguments

measure	numeric reach measure between 0 and 100
from	numeric flowline from-measure relative to the reach
to	numeric flowline to-measure relative to the reach

Value

numeric rescaled measure

Examples

rescale_measures(40, 0, 50)
rescale_measures(60, 50, 100)

nhdplusTools documentation built on March 31, 2023, 7:16 p.m.