I have a set of ortho slides (SID format) for my city. The slides do not overlap, and cover the entire city and immediate environs. What I want to do is create a grid-like polygon layer with separate polygons for each raster slide. All are equal in size (6k feet by 4k feet), so I would assume that this would involve creating a fishnet, right? The problem I am encountering is how to create the polygon in the first place. Would I create a larger polygon that would encase all the slides, and then create the fishnet from there?
Working with ArcMap Desktop v10.3.