How does one select polygons that are to the left side of a polyline. I have 2 shoreline layers - (1970 & 2010). I need to know the shoreline gain and shoreline loss. So I created polygons of the areas where there is overlap - this gives me net change. But to identify which polygons are gain and which ones are loss depends on their relation to the 1970 shoreline. So I need to select polygons that are on the outisde (gain) and then those on the inside (loss). Is there a tool for this? E.g. I need to select only the red polygons in the diagram attached? Your help will be much appreciated.
So basically create a parallel line or buffer on a known side of the line a short distance from the shoreline and use that to select the polygon features on a given side. If you use the buffer option make it slightly larger than you need and then select by location with a slightly negative buffer.