The Trace Downstream tool, provided by Esri, utilizes a hosted digital elevation model (DEM) to trace downstream flow paths based on precomputed hydrologic information using standard hydrologic models. The output is a hosted feature layer representing the downstream trace path.
This tool is useful for identifying the source of water entering storm drains, which could potentially carry pollutants downstream to rivers, lakes, oceans, or other waterways. The tool's input layer requires point features to serve as starting locations for each downstream trace line. The downstream path settings allow users to configure parameters such as split distance, maximum downstream trace distance, units for distance measurements, and clipping options using a polygon feature layer. The result layer parameters include specifying the output polyline feature layer's name, ensuring it is unique within the organization, and specifying a folder in "My Content" to save the results.
Limitations of the tool include a maximum input limit of 1,000 point features, and it can only process point features as input. Additionally, the tool's analysis environment settings can be modified to affect its results.
The tool honors specific analysis environments, providing flexibility in its application.
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