Display Flow Directions on ground surface by ArcGIS
Published on by Jordan Moon, GIS Engineer in Technology
Hi Water Networks Fellows,
I am a GIS Engineer. I would like to gently ask about flow directions by ArcGIS or QGIS.
I've a size of dem 0.1m by 0.1m.
I would like to draw raster file as below.
questions :
1. How to do it to generate the DEM like above?
2. All of path are arrow shapes, is it possible to generate like it?
Thanks.
Taxonomy
- GIS & Remote Sensing Technology
- GIS for network
- GIS Spatial Analysis
- GIS & Remote Sensing
- GIS Manager
2 Answers
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Hi Jordan. You can use ArcHydro tools under ArcGIS 10.1 or later to process DEM and to further analyse terrain, flow direction and many more analysis. In QGIS you can use TauDEM (Hydrology Analysis). If not clear how to work with TauDEM you can find on google many tutorials (https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=24&cad=rja&uact=8&ved=2ahUKEwi7yMmphfXfAhUj_CoKHRPrDKwQFjAXegQIChAC&url=https%3A%2F%2Fwww.engenious.com%2FContent%2FTutorial.pdf&usg=AOvVaw0M8E5dZvOuBnI1Gm6wgsM8)
Hope this is useful.
Stefan
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Hi Jordan I hope that you are using a gravity flow network and not a pressurised system. For the former you can convert ends of each element to XY points. Then use the GIS to join to the DEM. Then using simple geodatabase queries a 0 or 1 can be added to indicate the gradient direction. Use this to generate a flow arrow style. Reconstruct the poly lines and use the centre point to display the flow arrow Hope this helps