Drainage Analysis

Function Overview

The Drainage Line Algorithm is a method used to calculate the flow paths of water in a DEM (Digital Elevation Model). This algorithm is commonly used in GIS (Geographic Information Systems) and hydrology to simulate and analyze the flow of surface water.

Usage

To use this function, a digital elevation model (DEM) must first be generated. Click Terrain > Drainage Analysis.

### Parameter Settings ### - **DEM File**:The DEM file to be input.Refer to the [DEM](DEM.md) for details。 - **Runoff Area**:The total area of water flow passing through a given pixel during surface water flow. A smaller value will extract more tributary paths, while a larger value will retain more of the main flow paths. - **Output Path**: The algorithm will output the drainage line vector results and a related analysis report. ---------- DEM data (see the image on the left) and the drainage line analysis vector results (see the image on the right).

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The white lines represent drainage lines, which simulate the flow paths of surface water. The red points indicate the positions of confluence points, where surface water flows converge to a single outlet point.

The analysis report is shown in the image below.

Drainage Analysis