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geo_code长度和距离的对照表
| geohash length | width | height |
|---|---|---|
| 1 | 5,009.4km | 4,992.6km |
| 2 | 1,252.3km | 624.1km |
| 3 | 156.5km | 156km |
| 4 | 39.1km | 19.5km |
| 5 | 4.9km | 4.9km |
| 6 | 1.2km | 609.4m |
| 7 | 152.9m | 152.4m |
| 8 | 38.2m | 19m |
| 9 | 4.8m | 4.8m |
| 10 | 1.2m | 59.5cm |
| 11 | 14.9cm | 14.9cm |
| 12 | 3.7cm | 1.9cm |
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