Mercurial > hg > GlobalNeighbors

annotate tests/test_distance.py @ 0:5dba84370182

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author Jeff Hammel <k0scist@gmail.com>
date Sat, 24 Jun 2017 12:03:39 -0700
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1 #!/usr/bin/env python
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2
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3 """
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4 test distance calculation
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5 """
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6
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7 import math
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8 import os
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9 import unittest
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10 from globalneighbors import distance
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11 from globalneighbors.constants import Rearth
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12 from globalneighbors.locations import locations
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13 from globalneighbors.read import read_city_list
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14 from globalneighbors.schema import primary_key
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15
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16 here = os.path.dirname(os.path.abspath(__file__))
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17 data = os.path.join(here, 'data')
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18 full_tsv_lines = 149092
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19
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20 class DistanceTests(unittest.TestCase):
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21
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22 # created with
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23 # head -n 10 cities1000.txt > GlobalNeighbors/tests/data/sample.tsv
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24 test_tsv = os.path.join(data, 'sample.tsv')
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25 test_tsv_lines = 10
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26
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27 # full dataset: test with caution
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28 full_tsv = os.path.join(data, 'cities1000.txt')
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29 full_tsv_lines = 149092
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30
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31 def test_haversine(self):
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32
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33 # a simple canned case
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34 # equator to pole
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35 lat1 = 0.
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36 lat2 = 90.
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37 lon2 = 70. # undefined, technically
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38 expected_distance = 0.5*math.pi
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39
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40 for lon1 in range(-135, 135, 15):
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41 radians = [distance.deg_to_rad(degrees)
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42 for degrees in (lat1, lon2, lat2, lon2)]
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43 error = (distance.haversine(*radians) == expected_distance)
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44 assert error < 1e-4
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45
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46 def test_distance(self):
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47 """test distance between two known cities"""
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48
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49 # Source:https://en.wikipedia.org/wiki/List_of_cities_by_latitude
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50 # http://www.distancefromto.net/distance-from-new-york-to-chicago-us
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51 chicago = (40.71278,
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52 -74.00594)
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53
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54 new_york = (41.85003,
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55 -87.65005)
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56 ref_distance = 1149.
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57
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58 args = [distance.deg_to_rad(i) for i in
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59 list(chicago) + list(new_york)]
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60 calculated = distance.haversine(*args, r=Rearth)
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61
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62 # Allow some error for circular projection approximation
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63 error = abs(calculated - ref_distance)/ref_distance
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64
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65 assert error < 0.01
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66
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67 def test_distances(self):
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68 """"ensure disances monotonically decay"""
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69
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70 # parse the data
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71 assert os.path.exists(self.test_tsv)
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72 cities = read_city_list(self.test_tsv)
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73 assert len(cities) == self.test_tsv_lines
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74 city_locations = locations(cities)
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75 assert len(city_locations) == self.test_tsv_lines
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76
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77 # calculate all the neighbors
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78 # WARNING: n*2 algorithm Too computationally intensive
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79 # for full data set
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80 for key, value in distance.calculate_distances(city_locations,
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81 r=Rearth):
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82 # for now, just make sure we can iterate over them
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83 pass
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84
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85 def test_neighbors(self):
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86
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87 # parse the data
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88 tsv = os.path.join(data, 'sample.tsv')
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89 assert os.path.exists(tsv)
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90 cities = read_city_list(tsv)
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91 city_locations = locations(cities)
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92
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93 # calculate the neighbors
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94 neighbors = distance.calculate_neighbors(city_locations,
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95 k=self.test_tsv_lines)
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96 assert len(neighbors) == self.test_tsv_lines
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97
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98 # ensure distance increases for each thing
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99 for src, value in neighbors.items():
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100 distances = [i[-1] for i in value]
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101 assert len(distances) == self.test_tsv_lines - 1
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102 for i in range(1, len(distances)):
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103 assert distances[i] >= distances[i-1]
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104
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105 if __name__ == '__main__':
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106 unittest.main()