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[seethefruture]

Thank you for sharing, but I not master C++. I also encounter the problem of sharing bike area. Can you share the specific algorithm when have spare time.

[freeeyes]

You can find the algorithm code you need in https://github.com/freeeyes/geohash/blob/master/GeoHash/geohash.h
The core of geohash is grid management，
The algorithm is implemented here：
https://en.wikipedia.org/wiki/Geohash

[seethefruture]

After have an eye of Geohash algorithm, it found that there are too many geohash values if it has high accuracy requirements(1m). Is it means that Geohash is not suitable for me, or whether you hava a well-optimized solutions? For example, if i need to find a gas station nearby in a city, i need to store a great amounts of geohash values.

[freeeyes]

The latitude and longitude of geohash are calculated using latitude and longitude, and the error of latitude and longitude is currently less than half a meter. Don’t worry about using geohash at all. It mainly depends on the size of your block. Generally, it is the calculation of the surrounding nine-square grid. If it doesn’t work, you can use 15-square grid. It depends on your architecture design requirements. If it is just a general coordinate positioning query, it can be completely fulfilled.

[seethefruture]

it works well, thanks