Official comment
The overlap looks OK but smooth metal roofs have nearly 0 features on them to match. The combination of the repeating pattern of the ribs and the featureless middle makes this kind of roof very hard to map well.
From the Data Collection guidelines that are agreed to at the time of upload:
"Repeating Patterns - Since our processing relies on matching similar features, target areas with repeating patterns such as roofs or crops can confuse the system and make poor quality outputs."
Also:
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