So I have yet to do so, but this weekend I plan on going through all my diamond quilt projection maps and re-categorizing them by rotation (0 & 45 degrees). I have yet to make any quilts that are wholly asymmetric. I have thought about making one or two, but for some reason I just don’t like the way they look. I guess it’s a sense of balance I am after and when I have one seam going horizontally across the page and add another seam that is 25 degrees rotated, it just looks awkward. I’d rather have clouds, than an asymmetric map.
As for this map, the seam makes an interesting reflection on the Pennsylvania Convention Center. What I also discovered last night, and is something I look forward to doing some more research on, is how there is a secondary texture that is being created in these maps.
When an aerial photograph or satellite image is taken there is usually some degree of distortion embedded into the orthorectified (defined as correcting distortions in an aerial image to produce a more accurate depiction of surface features) photograph. This distortion is usually caused by the angle at which the photograph was taken (directly above- nadir or at an angle- oblique). Thus if you take a photograph overhead at nadir (0 distortion at the center), then the buildings at the center will only show their tops, and the buildings at the edge will show their sides due to the angle of viewing. The interesting thing I discovered was the way the angles change with the seams. If you look closely at the details below, this angle creates an embedded texture of rotating the angle in which the buildings show. Essentially, its oblique alterations in the fabric of the quilt, and I think they make the tessellations even more intricate.