Calculating average stream length per stream order

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05-23-2012 12:48 PM
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SeanLofgren
New Contributor
I have the strahler stream order layer and a stream length raster. How can I calculate the average lenth for each stream order? Is this possible? Any help would be greatly appreciated.
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AliAkel
New Contributor
Here's one way to do it. Though I don't know if it is the "proper" way:

-First convert your stream order layer to a polyline from:
Arc Toolbox > Conversion Tools > From Raster >  Raster to Polyline.
Add your stream order layer as an input and uncheck the "simplify polylines" box.

-Next add a new field to the attribute table of your newly created layer:
Arc Toolbox > Data Management Tools > Fields > Add Field
Choose your newly created layer as the input table and enter "length" (or whatever) as the field name. choose "LONG" as the field type.

-Now open the attribute table for the layer created in the first step, right-click on the field you've created and choose "calculate geometry". Choose your units and click OK.
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SeanLofgren
New Contributor
Thank You. That worked great and was exactly what I was looking for.
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JoshuaOmereonye
New Contributor

Hello Akel, i tried exactly what you said and it didn't work. i wasn't still able to calculate the stream length

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JoshuaOmereonye
New Contributor

Is there any alternative way of solving the problem?

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