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Using ASTER DEM, I have created Flow Accumulation. However, to create stream order, I was asked to input flow accumultation and stream raster. But I cannot find how to get the stream raster. Some forums say that I should threshold flow accumulation. How do I do this? Please guide me in the right direction.

I am using ArcGIS 10.

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As you are using ArcGIS 10, search the help for the topic Identifying stream networks. As you'll discover you need to use the CON tool.

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thanks for the help! –  user2543 Jun 4 '12 at 5:47
    
That's exactly what I was looking for, Thanks! –  Czed Jan 18 '13 at 16:09

The help file entries for Hydrologic Analysis are very good, and lead you step-by-step through the processes needed to create your stream network in ArcGIS.

If you follow these steps in order you should find the answer you're looking for.

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