Hi, I am using a polygon fishnet to divide a county into 2km tetrads and I can do that fine but the tetrads do not line up with the gridlines on an OS map. I am using British National Grid projected co-ordinates. Should I be using a different one? or something else?
Your OS map (not familiar with the term) should provide you with some way to reference the coordinate system, as well as, hopefully, some coordinates to locate your grid. You can shift the grid back and forth using the origin coordinate parameters.
