Sadly i haven't found a way. Rooftops, especially those of buildings in cities produce vary varied values so its very difficult to tell slope without just looking on google earth. I know you can use the 3D analyst tool to produce a value if you're not analyzing many buildings and want to do it manually. but still unsure what to do for a large amount. I'm currently trying to eliminate buildings from my focus area by removing listed buildings/churches/open top multistory car parks etc, and then try to come up with something for what remains.
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