-
Notifications
You must be signed in to change notification settings - Fork 33
/
proximityhash.py
162 lines (110 loc) · 4.92 KB
/
proximityhash.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
import geohash2
import georaptor
import math
import time
import argparse
from clint.textui import puts, indent, colored
def in_circle_check(latitude, longitude, centre_lat, centre_lon, radius):
x_diff = longitude - centre_lon
y_diff = latitude - centre_lat
if (math.pow(x_diff, 2) + math.pow(y_diff, 2) <= math.pow(radius, 2)):
return True
return False
def get_centroid(latitude, longitude, height, width):
y_cen = latitude + (height / 2)
x_cen = longitude + (width / 2)
return (x_cen, y_cen)
def convert_to_latlon(y, x, latitude, longitude):
pi = 3.14159265359
r_earth = 6371000
lat_diff = (y / r_earth) * (180 / pi)
lon_diff = (x / r_earth) * (180 / pi) / math.cos(latitude * pi/180)
final_lat = latitude+lat_diff
final_lon = longitude+lon_diff
return (final_lat, final_lon)
def create_geohash(latitude, longitude, radius, level, georaptor_flag=False, minlevel=1, maxlevel=12):
x = 0.0
y = 0.0
points = []
geohashes = []
grid_width = [5009400.0, 1252300.0, 156500.0, 39100.0, 4900.0, 1200.0, 152.9, 38.2, 4.8, 1.2, 0.149, 0.0370]
grid_height = [4992600.0, 624100.0, 156000.0, 19500.0, 4900.0, 609.4, 152.4, 19.0, 4.8, 0.595, 0.149, 0.0199]
height = (grid_height[level - 1])/2
width = (grid_width[level-1])/2
if (latitude > 60 or latitude < -60):
height = (grid_height[level - 1])/8
width = (grid_width[level - 1])/8
if (latitude > 82 or latitude < -82):
height = (grid_height[level - 1])/32
width = (grid_width[level - 1])/32
if (latitude > 89 or latitude < -89):
height = (grid_height[level - 1])/256
width = (grid_width[level - 1])/256
lat_moves = int(math.ceil(radius / height)) #4
lon_moves = int(math.ceil(radius / width)) #2
for i in range(0, lat_moves):
temp_lat = y + height*i
for j in range(0,lon_moves):
temp_lon = x + width*j
if in_circle_check(temp_lat, temp_lon, y, x, radius):
x_cen, y_cen = get_centroid(temp_lat, temp_lon, height, width)
lat, lon = convert_to_latlon(y_cen, x_cen, latitude, longitude)
points += [[lat, lon]]
lat, lon = convert_to_latlon(-y_cen, x_cen, latitude, longitude)
points += [[lat, lon]]
lat, lon = convert_to_latlon(y_cen, -x_cen, latitude, longitude)
points += [[lat, lon]]
lat, lon = convert_to_latlon(-y_cen, -x_cen, latitude, longitude)
points += [[lat, lon]]
#print("Points: "+ str(points))
for point in points:
geohashes += [geohash2.encode(point[0], point[1], precision=level)]
if georaptor_flag:
georaptor_out = georaptor.compress(set(geohashes), int(minlevel), int(maxlevel))
return ','.join(georaptor_out)
else:
return ','.join(set(geohashes))
def main():
start_time = time.time()
georaptor_flag = False
minlevel = 1
maxlevel = 12
# Fetch input arguments
parser = argparse.ArgumentParser()
parser.add_argument('latitude', help='latitude of the center point')
parser.add_argument('longitude', help='longitude of the center point')
parser.add_argument('radius', help='radius of coverage in metres')
parser.add_argument('precision_level', help='geohash precision level')
parser.add_argument('--georaptor', default=False,
help='georaptor flag to compress the output (default: false)')
parser.add_argument('--minlevel', default=1,
help='minimum level of geohash if georaptor set to true(default: 1)')
parser.add_argument('--maxlevel', default=12,
help='maximum level of geohash if georaptor set to true(default: 12)')
args = parser.parse_args()
latitude = args.latitude
longitude = args.longitude
radius = args.radius
precision_level = args.precision_level
if 'georaptor' in args:
georaptor_flag = args.georaptor
if 'minlevel' in args:
minlevel = args.minlevel
if 'maxlevel' in args:
maxlevel = args.maxlevel
puts(colored.green('\nGenerating geohashes for\n'))
puts(colored.red('latitude: ' + latitude))
puts(colored.red('longitude: ' + longitude))
puts(colored.red('radius: ' + radius))
puts(colored.red('precision_level: ' + precision_level))
if georaptor_flag:
puts(colored.red('georaptor: ' + str(georaptor_flag)))
puts(colored.red('minlevel: ' + str(minlevel)))
puts(colored.red('maxlevel: ' + str(maxlevel)))
puts('\n')
puts(colored.red('Output:'))
print(create_geohash(float(latitude), float(longitude), float(radius), int(precision_level), georaptor_flag, int(minlevel), int(maxlevel)))
et = time.time() - start_time
puts(colored.green('\nTotal execution time: ' + str(et) + ' seconds\n'))
if __name__ == "__main__":
main()