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3

You have to use a projected CRS like UTM (for your part of the world) to get real circles and meters as units. Please do not use Google/Web Mercator, it does not use real meters as units (only at the aequator).


2

I don't think using Intersect is a good idea as you only have uploaded 1 point file. If you had a line layer with the roads involved, you could very easily intersect the buffers with the roads. An alternative may be to use a Query (Layer > Query...) to filter out the buffers you desire based on the Severity Index. Use something like: "VL_GRAVIDA" >= 20 ...


1

I figured it out, FYI, or rather I found the answer on ESRI help page: http://resources.arcgis.com/en/help/main/10.1/index.html#//01m60000002w000000 Clip the inner buffer in an editing session rather than with the Clip tool.


1

Choose a suitable UTM grid for your area (see https://de.wikipedia.org/wiki/UTM-Koordinatensystem#mediaviewer/File:LA2-Europe-UTM-zones.png ), probably 32 or 33 (north). Save your layer in the chosen UTM coordinate system. Use the buffer tool on the new UTM layer.



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