市场下滑13%？手机行业将有哪些因变？
Crucially, this distribution of border points is agnostic of routing speed profiles. It’s based only on whether a road is passable or not. This means the same set of clusters and border points can be used for all car routing profiles (default, shortest, fuel-efficient) and all bicycle profiles (default, prefer flat terrain, etc.). Only the travel time/cost values of the shortcuts between these points change based on the profile. This is a massive factor in keeping storage down – map data only increased by about 0.5% per profile to store this HH-Routing structure!
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The performance impact on typical applications will be much smaller, since they don’t usually present walls of icons in their UI.
Estimated shortcuts: ~91 million (a manageable number for global routing)
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