I plan to add Street View imagery to a list of directions in a routing
system. But many of the routes will be in places without Street View
imagery. AFAIK the only way to find that out whether the imagery
exists is to make a lot of separate
GStreetviewClient.getNearestPanorama() calls, one for each section of
the route.

Or is there another way?

If not, it seems there is a good case for a new function to ask 'is
there any Street View imagery in this polygon'. That would save a lot
of redundant server calls.
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