Thanks for the replies. I saw Keith's enhancement in the 2022.01 release notes and have been anxious to put the enhancement to work.
I'm still in 2D and will give Ron Howard's method a try as in the video. I am resisting going to 3D as I really don't have the resources.
My fallback idea was to put measurements on PVC pipes, put them at different points in my yard to take depth into account, then take new pictures of my yard. Not exact but close enough.