Use GEORADIUS with Lat/Long coordinates

[Michael Kolber]

Hello,

Is it possible to use coordinates to describe the radius for a GEORADIUS command? I know I can use the Haversine formula to get an actual distance, and use that, but since I already have the latitude and longitude of the radius given to me, I would prefer to use that rather than have to calculate the radius each time.

Thank you.

[Itamar Haber]

Hello Michael,

No - presently the `GEORADIUS[BYMEMBER][_RO]` commands do not support calculating the radius from a lat/lon pair. Until this functionality is added, if at all, you should continue performing the calculation.

Note, however, that you can call `GEODIST` to obtain the radius if you add the provided coordinate temporarily to the GeoSet. This could, arguably, be wrapped into a Lua script such as:

local gs = KEYS[1]                -- the geoset

local ele = ARGV[1]               -- the element in the geoset

local lon, lat = ARGV[2], ARGV[3] -- lon and lat of the "radius"

local tmp = ARGV[4]               -- some random unique value

redis.set_repl(redis.REPL_NONE)

redis.call('GEOADD', gs, lon, lat, tmp)

local rad = redis.call('GEODIST', gs, ele, tmp)

redis.call('ZREM', gs, tmp)

return redis.call('GEORADIUSBYMEMBER', gs, ele, rad, 'm')

Cheers,

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Itamar Haber Technicalist Evangenly Phone: +972.54.567.9692

[Michael Kolber]

This is great, thank you! !תודה רבה :)