Plotting new off-set points in Arcgis

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I have a task where I have plotted positions along an alignment (see red dots in images) and I need to plot two offset points (from the chainage locations) at varying distance parallel to the alignment (see image 2). I am not sure how to go about it.



I have thought about:

• working out the direction of the line and from that,
• then working out what the offsets x,y should be using trigonometry,
• create new points for the offset using the results of the trigonometry.

I was also thinking of:

• creating a 1m buffer around the points,
• using the buffer to clip the line into segments, then
• copy the line parallel on the left and right side using the specified distances
• then use feature vertices to points tool with mid as the point type to get the offset positions.

If there were only a few points, I would use the second method above, but unfortunately, I have hundreds. If anyone could provide some guidance, it would greatly be appreciated.

I am familiar with Arcgis 10.1 and have a sound understanding of Arcpy and python.



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