I have a friend who does air photos. He told me if they're doing it for engineers or something, then they're not that likely to notice unless you're growing in a pot that you spraypainted neon pink, given that you surround the plants by other plants that help it blend in. If they're specifically targeting pot growers, then you better hope they don't find you. Cannabis plants are extremely UVA/UVB resistant, which is easily noticeable through their cameras.