Diapositives - transparencies on stable based film.
Photo mosaics involve joining together several aerial photos to form a single non-rectified image.
Generally, the mosaic is re-photographed and enlarged to your specifications. This enables large areas to be covered by one image similar to a satellite image . Orthophotos are photo mosaics with some text annotation. They are available over selected areas. Prints may be ordered individually or in blocks to give either plain cover or stereoscopic cover.