Available with Spatial Analyst license.
Overview
Creates a raster layer of upstream or downstream distance, or weighted distance, along the flow path for each cell.
A primary use of the Flow Length function is to calculate the length of the longest flow path within a given basin. This measure is often used to calculate the time of concentration of a basin. This is done using the Upstream option. The function can also be used to create distance-area diagrams of hypothetical rainfall and runoff events using the weight raster as an impedance to movement downslope.
This is a global raster function.
Notes
The value type for the Flow Length output raster layer is floating point.
Parameters
Parameter name | Description |
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Flow Direction Raster | The input raster that shows the direction of flow out of each cell. The flow direction raster can be created by running the Flow Direction function. |
Direction of Measurement | The direction of measurement along the flow path.
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Weight Raster | An optional input raster for applying a weight to each cell. If no weight raster is specified, a default weight of 1 will be applied to each cell. |