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Conditional Statement in Hydrology

Question asked by icemannn1989 on Apr 27, 2015

Hello, I am delineating streams using the hydrology tools in the arc toolbox and I have an issue. It is not that I dont know how to do it or what tool to use, but it is a threshold decision. The "conditional statement" defines the minimum number of pixels that are required to "flow" into another pixel in order for that pixel to be delineated as a stream. I have a 2m, high resolution DEM spanning 164 km2.

 

My question is, if I can put in what ever value I want, how can I remove the subjectivity from that decision? I am currently using a conditional statement of 13,000 pixels (an area of about .1 km). How can I validate this or is there even a way to validate this?

 

Thank you for your time, Michael

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