Mercurial > hg > GlobalNeighbors

annotate globalneighbors/grid.py @ 16:4583d0d9331a

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stub command line entry for gridding neighbors
author Jeff Hammel <k0scist@gmail.com>
date Sun, 25 Jun 2017 15:03:54 -0700
parents 21095c9006e5
children 2fef925fbf37
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1 #!/usr/bin/env python
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2
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3 """
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4 grid locations, for speed and fidelity
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5 """
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6
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7 import math
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8 import sys
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9 from .cli import CitiesParser
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10 from .locations import locations
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12 class LatLonGrid(object):
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13
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14 lat_range = (-90., 90)
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15 lon_range = (-180., 180) # however, this wraps around
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17 def __init__(self, nlat, nlon):
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18 self.n = (nlat, nlon)
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19 self.range = (self.lat_range, self.lon_range)
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20 self.d = ((self.lat_range[-1] - self.lat_range[0])/self.n[0],
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21 (self.lon_range[-1] - self.lon_range[0])/self.n[1])
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22 self.create_grid()
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23
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24 def create_grid(self):
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25 self.grid = []
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26 for _ in xrange(self.n[0]):
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27 self.grid.append([set() for _ in xrange(self.n[-1])])
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29 def add(self, geoid, lat, lon):
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30 latlon = (lat, lon)
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31 self[self.index(lat, lon)].add(geoid)
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32
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33 def __getitem__(self, index):
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34 """
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35 index -- 2-tuple or list of i and j indices
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36 """
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37 return self.grid[index[0]][index[1]]
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38
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39 def index(self, lat, lon):
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40 return [int(math.floor((val-self.range[i][0])/self.d[i]))
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41 for i, val in enumerate((lat, lon))]
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42
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43 def neighbors(self, i, j):
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44 """
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45 return neighbors of points i, j
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46 """
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47 imat = [i]
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48 jmat = [j]
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49
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50 # latitude
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51 if i:
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52 imat.append(i-1)
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53 if i < self.n[0]-1:
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54 imat.append(i+1)
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55
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56 # longitude: wraps around
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57 if j:
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58 jmat.append(j-1)
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59 else:
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60 jmat.append(self.n[-1] - 1)
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61 if j == self.n[-1] - 1:
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62 jmat.append(0)
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63 else:
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64 jmat.append(j+1)
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66 return [(_i, _j) for _i in imat for _j in jmat
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67 if (_i,_j) != (i,j)]
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68
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69 def neighbor_points(self, i, j):
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70 """return all points in a lat-lon box"""
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71 geoids = set()
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72 geoids.update(self[(i,j)])
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73 for ii, jj in self.neighbors(i,j):
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74 geoids.update(self[ii,jj])
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75 return geoids
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76
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77
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78 class GriddedLocations(object):
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79
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80 def __init__(self, locations):
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81 raise NotImplementedError('TODO')
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82
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83 def main(args=sys.argv[1:]):
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84 """CLI"""
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85
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86 # parse command line
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87 parser = CitiesParser(description=__doc__)
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88 options = parser.parse_args(args)
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89
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90 # read locations
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91 city_locations = locations(parser.read_cities())
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92
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93 if __name__ == '__main__':
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94 main()
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95