X Axis: Resolution. Y Axis: When the image was taken. Our notion of technology: Perfect arrow going up at y=x. I was mapping this park area. I looked at 5 different Satellites. The highest quality Satellite Imagery did not show a sidewalk that a the rest of the low resolution maps showed. I had two thoughts: 1. They ripped out a perfectly good map (Nope). 2. The low quality imagery is more recent.