We already have findagrave.com and similar sites. They generally just have a 2D photo of the headstone. Some users have added more detail around location. I have spent an entire afternoon looking for a headstone in a large cemetery before. But you can always go to the cemetery office when they are open (I was there on a weekend when they were closed). The office can tell you exactly where the plot is located.

TLDR: we have a basic website that does this in a limited capacity. This would be a tremendous amount of work for marginal improvement.