Geohash: Difference between revisions

And, going the other direction (producing a min and max lat and long value for the geohash):

<syntaxhighlight lang=J>hsahoeg=: {{

bits=: |.|:0,~_2]\,(5#2)#:gdigits i.y

scale=: %2^{:$bits

lo=: scale*#.bits

hi=: scale*(2^1+1 0*2|#y)+#.bits

0.5*_180+360*lo,.hi

}}</syntaxhighlight>

This gives us:

<syntaxhighlight lang=J> hsahoeg 'gc'

50.625 56.25

_5.625 0

hsahoeg 'gcpue5hp4'

51.4337 51.4337

_0.107074 _0.107052

hsahoeg 'u4pruydqqvj'

57.6491 57.6491

5.20372 5.20372</syntaxhighlight>

Or

<syntaxhighlight lang=J> 9!:11]10 NB. display 10 digits of floating point precision

hsahoeg 'gcpue5hp4'

51.43369675 51.43373966

_0.1070737839 _0.1070523262

hsahoeg 'u4pruydqqvj'

57.64910996 57.6491113

5.203719512 5.203720182</syntaxhighlight>