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Geohash encoder and decoder

Encode coordinates to a geohash at any precision, decode a geohash into bounds, centre, and neighbours, and compare two hashes by shared prefix.

Enter a latitude and longitude to encode them.

A geohash names one rectangular cell of the map. Each extra character halves the cell both ways, so precision is a trade: four characters is a city block or two, nine puts a point inside a building. Two hashes that share a prefix sit in neighbouring or nearby cells, but two hashes that share nothing can still be close across a cell edge, which is what the compare mode's overlap and distance figures are for. Cell sizes in metres are spherical approximations, good for choosing a precision, not for surveying.
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Canonical HTML: https://nutter.tools/data/geohash-encoder-decoder
Markdown version: https://nutter.tools/data/geohash-encoder-decoder.md
Plain-text version: https://nutter.tools/data/geohash-encoder-decoder.txt
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