Even signs of handling, like crop marks, add to their value.
"I was convinced they would not be interested because most of our prints, like most newspaper prints, have various marks: retouching marks, crop marks, various annotations on the back," he said.
The oldest site on the list is a Neolithic henge at Northorpe in Yorkshire, completely ploughed out at ground level, but still visible from the air as crop marks in a field.
Signs of it were first detected in northern Africa in the 1830s, through surviving crop marks and roads, and have since (especially through air photography) been traced in the environs of Trier and Homs (Syria) and large areas of northern Italy, Tunisia, and elsewhere.
Comparing the resulting maps with an aerial photograph revealing the location of the ice-wedges through polygonal crop marks, showed that MPS reconstructed the polygonal patterns much better.
Ancient camps, ovens, rubbish pits and ditches show up from the air as crop marks, where plants grow differently - often invisible from the ground.
In this rugged, Apennine area, traditional aerial archaeology approaches have in the past failed to yield good results as regards the detection and documentation of subsurface structures through crop marks.
The image was segmented into three competing regions to improve the visibility of buried remains showing in the image as crop marks (i.e. centuriations, agricultural allocations, ancient roads, etc).
The moderate to excellent spatial consistency (R2 0.19–0.82) of ECa patterns and LAI crop marks that indicate a higher water storage capacity as well as the increased correlations between large-offset ECa data and the subsoil clay content and soil profile depth, implies that along this buried paleo-river structure the subsoil is mainly responsible for better crop development in drought periods.
All are one-of-a-kind originals, complete with crop marks and photographer's captions.
Try using the Golden Ratio crop marks.
