How to calculate proportion of a line segment around a point?

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I am looking at certain variables surrounding points that represent Sea otter raft sites. The coast line surrounding the points is broken into unit lines (Essentially a polyline with attributes for various segments). For example, The unit lines have Oil Residency Index (ORI)(from 1 to 5) as well as a physical exposure proxy for each segment (segments range in length).

I want to calculate the proportion of different ORI and Exposure classes around each point (500m buffer). IE- What proportion of ORI class 1,2,3,4,5 are there around each point respectively.

I am using ArcGIS 10.2

Thoughts and ideas?



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