Hi xander_bakker, blake.terhune, dkwiens, Sorry for the late reply. I just found out the Geonet has moved my post to this page. My overall goal is to compare the polygons by the population by showing arrowhead along the boundaries. In my original shapefile, there were hundreds of polygons. Because I didn't know how to do it at that time, so, I ended up doing this manually in Auto cad. I overlaid a grid layer on the polygons, then placed the arrow heads one by one in each grid, so there were arrow heads along the polygon's boundaries evenly. I have done something similar to the xander_bakker's suggestion. The only problem was our client wanted the arrow head in cad format. I had all those arrow heads pointing to the boundary perpendicularly in the shapefile. However, when I converted it to cad, something went wrong and the orientation of those arrow heads were all messed up. I also tried to save them as the annotation but it didn't work out during the conversion. So I had to do it manually instead. I had suggested blake.terhune suggestion to our client when I first started on this project, however, they only wanted the arrow heads. I will try dkwiens suggestion. Thanks for showing me how to remove the duplicated line. When I was brainstorming this earlier, I thought about doing something like that, but I couldn't figure out how to remove the duplicated line at that time. We have to deliver the arrowhead whenever there is a boundary changed. I will denitely try our your approach. Thank you so much!
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