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I need a way of automating this whole process rather than measuring the angle manually.

I want to calculate the largest viewing angle from each of the viewpoints (red dots) in relation to the locations (yellow dots).

From the example the below, i have identified the furthest left and right point, the yellow triangle vertices, in the cluster. Then measuring the angle using the measure tool, its 71.93 degrees.

However, i need to do this for all viewpoints and want to automate the process to possible create 3 attributes in the viewpoint shapefile; LEFT_ID, RIGHT_ID and ANGLE.

Any ideas?

Viewpoint looking out at the locations

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    Jun 24 at 8:05

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