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Lovely idea - but I’m not sure height of the building data is accurate enough.

For example, here in Edinburgh one of the best (indeed rare) beer gardens is the Pear Tree:

Which is notorious for the dreaded shadow of nearby Appleton Tower (8 stories, immediately to the west) curtailing an evenings imbibing..

It gets the building data from OpenStreetMap, there isn't any info on the height (so it must be guessing):

They link to a more detailed description, it isn't very prominent:

Yeh, it mostly guesses as there isn't that much height data ;)