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Between scheduling hassles, roof diversity, and dealing with trees, solar surveying is difficult enough as it is. Then you add roof obstructions. Often built to blend in, these obstructions are difficult to manually measure, and you need to get the 3D measurements to optimize your shading analysis. Plus, you’re climbing up on the roof unless you have a drone. On most roofs, there are eight types of obstructions to watch for. Here’s what you can do about them.