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add neighbors function #2

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add neighbors function #2

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2 changes: 1 addition & 1 deletion Geohash/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,4 +18,4 @@
License along with Geohash. If not, see
<http://www.gnu.org/licenses/>.
"""
from geohash import decode_exactly, decode, encode
from geohash import decode_exactly, decode, encode, neighbors, neighbor
28 changes: 28 additions & 0 deletions Geohash/geohash.py
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Expand Up @@ -107,3 +107,31 @@ def encode(latitude, longitude, precision=12):
bit = 0
ch = 0
return ''.join(geohash)

def neighbor(geohash,direction):
(lat, lon, lat_err, lon_err)=decode_exactly(geohash)
neighborLat=lat+direction[0]*lat_err*2
neighborLon=lon+direction[1]*lon_err*2
return encode(neighborLat, neighborLon, len(geohash))

def __encodeNeighbor(lat,lon,lat_err, lon_err,direction,length):
neighbor_lat = lat + direction[0] * lat_err;
neighbor_lon = lon + direction[1] * lon_err;
return encode(neighbor_lat, neighbor_lon,length )

def neighbors(geohash):
hashstringLength=len(geohash)
(lat, lon, lat_err, lon_err)=decode_exactly(geohash)

neighborHashList=[
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[-1,1],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[0,1],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[1,1],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[-1,0],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[0,0],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[1,0],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[-1,-1],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[0,-1],hashstringLength),
__encodeNeighbor(lat, lon, lat_err*2, lon_err*2,[1,-1],hashstringLength)
]
return neighborHashList