In addition to viewing three-dimensional maps and generating contour lines, DEM data can also be used for hydrological analysis. Here I will introduce how to use ArcGIS Pro to extract river network water systems through hydrological analysis. I hope it will be helpful to you.
Data Sources
The data used in this tutorial is DEM data downloaded from the Shuijing micromap. In addition to DEM data, common GIS data can be downloaded from the Shuijing micromap. You can follow the public account "Shuijing Note GIS" and then You can get the software download address by replying "Micro Picture" in the background . Of course, you can also download it directly from the official website of Shuijingzhu GIS.
Miniature map of water meridian
Fill grid
Click "Spatial Analyst Tools\Hydrological Analysis\Fill" in the toolbox to call the fill tool, as shown in the figure below.
Call the fill tool
In the displayed filling dialog box, the input surface raster is the DEM data to be processed, and the output surface raster is set, as shown in the figure below.
Fill settings
Calculation flow
Click "Spatial Analyst Tools\Hydrological Analysis\Flow Direction" in the toolbox to call the flow direction tool, as shown in the figure below.
Call flow tool
In the displayed flow direction dialog box, the input surface raster is the raster obtained by filling in the previous step, and sets the output flow direction raster, as shown in the figure below.
Flow settings
Calculate traffic
Click "Spatial Analyst Tools\Hydrological Analysis\Flow" in the toolbox to call the flow tool, as shown in the figure below.
Call traffic tools
In the displayed flow dialog box, the input flow direction raster is the flow direction raster obtained in the previous step, and sets the output accumulation raster data, as shown in the figure below.
Traffic settings
Raster calculation
Click "Spatial Analyst Tools\Map Algebra\Raster Calculator" in the toolbox to call the raster calculator tool, as shown in the figure below.
Call the raster calculator tool
In the displayed raster calculator dialog box, enter the following formula Con("FlowAcc_Flow1">900,1), which means that flow cells with accumulation greater than 900 are set to 1, as shown in the figure below.
Raster calculator settings
River network vectorization
Click "Spatial Analyst Tools\Hydrological Analysis\Raster River Network Vectorization" in the toolbox to call the raster river network vectorization tool, as shown in the figure below.
Call the raster river network vectorization tool
In the displayed raster river network vectorization dialog box, the input river raster is the raster calculated from the previous raster step, the input flow direction raster data is the flow direction raster, and the output polyline elements are set, as shown in the figure below.
Raster river network vectorization settings
Click Run to get the vectorized river network data. The extracted river network data is shown in the figure below.
Extracted river network data