I found this headstone while visiting the Plainfield Township Cemetery in Plainfield, Illinois. It was lying on the ground next to a tree. While inspecting the headstone I saw that it was almost impossible to read. I placed the headstone against the tree and took both videos and photos of the headstone. I used the videos to create a 3D image of the headstone. As you can see, a lot of the details were hidden due to wear.

This is the headstone for Johann Ruffer located at the Saint John's UCC Cemetery in Cottleville, Missouri.

This is the headstone for Anna M. located in the All Saint's Cemetery in Saint Peters, Missouri.

The input to photogrammetry is photographs, and the output is typically a map, a drawing, a measurement, or a 3D model of some real-world object or scene. Many of the maps we use today are created with photogrammetry and photographs taken from aircraft.