Display Flow Directions on ground surface by ArcGIS

Published on by 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. 

question.png

 

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

2 Answers

  1. 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

  2. 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