It has been reported the origin of rice crop is going up 10,000 years ago, and also the origin of bronze product is going up 5,500 years ago in China. We researched two huge ancient archaeological sites by photo-interpretations using high-resolution satellite images and low-altitude aerial color pictures and infrared pictures taken by radio- controlled model helicopter. Low-altitude aerial photogrammetry is available to research about soil and plant marks in archaeological fields. And we also have used electromagnetic-wave research for underground archaeological remains.
"Photo-decipher (interpretation) and electromagnetism research for ancient Chinese village sites", Proc. SPIE 3174, Videometrics V, (7 July 1997); doi: 10.1117/12.279794; https://doi.org/10.1117/12.279794