Tool Name	Maximum Flow Path Length
Tool ID	27
Library ID	ta_hydrology
Version	1.0
Author(s)	O.Conrad (c) 2016

Description

This tool calculates the maximum upstream or downstream distance or weighted distance along the flow path for each cell based on 'Deterministic 8 (D8)' (O'Callaghan and Mark 1984) flow directions.

References

O'Callaghan, J.F. & Mark, D.M. (1984): The extraction of drainage networks from digital elevation data. Computer Vision, Graphics and Image Processing, 28:323-344. doi:10.1016/S0734-189X(84)80011-0

Parameters

Name	Type	Identifier	Description	Constraints
Input
Elevation	grid, input	ELEVATION
Weights	grid, input, optional	WEIGHTS
Sinks	grid, input, optional	SINKS	A grid indicating sink (terminal) cells. Cells with valid values (i.e. not NoData) act as sinks that capture all incoming flow and sediment and do not route anything downslope.
Output
Flow Path Length	grid, output	DISTANCE
Options
Direction of Measurement	choice	DIRECTION		Available Choices: [0] downstream [1] upstream Default: 0