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I know this is an old thread, but I think there are much easier answers to your question. If you want to classify your data by Standard Deviation, you can choose this classification option under the Symbology tab of Layer Properties. Once you do that, you can see, very rapidly, where the stdev breakpoints are, and can then use those breakpoints in any ...


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This was meant to be a comment on the above answer - sorry. Syntax would vary depending on the type of DB your Contours are stored in but the given solution seems to pick contours after rounding their values. So for example in my test this achieved a selected set that included .3 m as well as .4 m. In fact, it excluded none of the values. This equation ...


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From the look of your screen shot it looks like you have used the utility network analyst toolbar and the Trace Upstream option? So... not ArcHydro? If this is correct then click on the down arrow next to the word Analysis and select options. Under the results tab set results format to selection. This will select the polylines and you can compute the total ...



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