Hmm. For some reason when I was looking earlier at the vintage of imagery it told me that esri clarify was newer than bing. Now it shows otherwise. I do see the feature you are referring to in bing imagery, but i'm not sure if it's a covered up pool. Its perimeter looks too flat. I'd expect a fence or something else. To me it looks more like different paving on the ground. Maybe a volleyball court or a playground. But ultimately on the big G it is clearly visible as a pool. 😉👍
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