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The black line on your fence is a shadow.
Its caused by 3 things........1. the plane/satellite isn't directly over the top of your house, 2. sun angle(must not be below 30deg) and 3. technical mumbo jumbo that sounds impressive when you say Parallax...it has to do with the 60% overlap of the photos that gives it the 3D shape, that allows them to determine elevations in post processing.
-remove nerd hat
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