Photogrammetry vs Bing

What is the difference between these two settings?

Bing Data World Graphics is the vast majority of scenery data you see in the sim and Photogrammetry are the highly detailed 3D renderings of ~450 or so special scenery areas around the world.

You need Bing data enabled to have the most realistic worldwide scenery. Photogrammetry is not necessary unless you want those special highly detailed locations. These areas required significantly more gigabytes of streamed data to render in the sim. Here’s a link to an article explaining these special areas.

Others can feel free to hop in here with their explanations as well.

Thanks. I had both turned off. Is the Bing data more useful at higher altitudes or lower?