This post is meant to show how a “good” plot picture looks like. I did the tests in my back yard.

Things to note are:

1. All the markers are completely visible.
2. The chessboard marker is completely visible when all the squares and the black margin can be seen.
3. My foot is in the shot. This should be avoided as much as possible.
4. The sphere markers have shadows facing the shot. This should be avoided if possible, but should be OK when we run the algorithm. Look for an angle to minimize this.Good Plot Picture
5. Most of the sphere is noticeable. Thought they will be close to vegetation, we must try to maximize visibility.
6. How deep you place the sphere on the ground will depend on surrounding vegetation and stability. Putting it as low as possible so it does not get blown away, but is completely visible.
7. The red chessboard goes with the red sphere markers.
8. There are no shadows on the markers. This could hinder the algorithm from correctly detecting.

Remember to take more than one picture of the same plot from different places. This will increase the possibility of getting a “good” detectable picture.