G14 · Design Google Maps Tile Service G14 · 设计 Google 地图瓦片服务
Verified source经核实出处
Maps interview classic at Google. Credibility A.
Key decisions关键决策
- **Pyramidal tiling (z, x, y)** in Mercator projection.**金字塔瓦片 (z, x, y)** Mercator 投影。
- **Vector tiles at high zoom**; raster for low zoom static views.**高缩放用矢量瓦片**；低缩放用栅格。
- **Aggressive edge caching**: content-addressed tiles with versioned URLs.**强边缘缓存**：瓦片内容寻址；URL 版本化。
- **Diff-based updates** for changed features.**差分更新**：底层特征变化时增量重建。
Follow-ups追问
- Traffic overlay freshness? separate tile layer updated every 60 s.路况图层？独立瓦片层每 60 s 更新。