Almost an endless source of such photographs is Google Earth, as well as any other available sources of aerial photos (aerial archaeologists may find a lot through their archives).
Halos isang walang katapusang pinagmulan ng dry litrato Google Earth, pati na rin ang anumang iba pang mga magagamit na mapagkukunan ng panghimpapawid na larawan (aerial archaeologists ay maaaring makahanap ng maraming sa pamamagitan ng kanilang mga archive).