SnapToPourPoint: Snap to pour point

In ECCC-MSC/Basin-Delineation: Finds upstream area and upstream stations

Description

Finds the nearest location on a stream segment to a hydrological station and returns the pourpoint as a spatialpointsdataframe with the same attributes as the input station.

Usage

SnapToPourPoint(station, in_DEM, saga_env, upstr_threshold = 35000)

Arguments

station	spatialpointsdataframe representing a hydrological station
in_DEM	character path pointing to hydrologically conditioned DEM. Must be in projected coordinate system and, at a minimum, have filled sinks.
saga_env	A SAGA geoprocessing object. Suggested version is 2.2.2.
upstr_threshold	integer, number of upstream cells required to initiate channel growth. A smaller number will yield more channels and will snap to smaller streams. Larger numbers will produce only major channel branches. For a 50k DEM, numbers between 20,000 and 50,000 are appropriate to reproduce the main channel network without many small branches.

Value

a SpatialPointsDataFrame with the same data as the input station, but located on a DEM stream branch.

ECCC-MSC/Basin-Delineation documentation built on June 9, 2019, 7:29 p.m.