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it's an approximation of dangerous areas, catenary curves are more accurate than straight lines but you don't know the length of the cable so you don't know the droop height.

OpenPoleMap is achievable. Just don't expect local governments to subsidise the mapping of obstacles to drones of the likes of Amazon.

Most "utility pole maps" only show poles with power lines on them.

A ton of telco cables are on telco-only poles (basically just a really straight tree trunk shoved in the ground, no cross-arms at all).