Mercurial > hg > GlobalNeighbors

annotate globalneighbors/grid.py @ 10:21ed15391e8a

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add a placeholder view for a city based on geoid
author Jeff Hammel <k0scist@gmail.com>
date Sun, 25 Jun 2017 12:28:36 -0700
parents 638fad06e556
children d1b99c695511
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1 import math
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2
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3 class LatLonGrid(object):
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5 lat_range = (-90., 90)
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6 lon_range = (-180., 180) # however, this wraps around
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8 def __init__(self, nlat, nlon):
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9 self.n = (nlat, nlon)
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10 self.range = (self.lat_range, self.lon_range)
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11 self.d = ((self.lat_range[-1] - self.lat_range[0])/self.n[0],
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12 (self.lon_range[-1] - self.lon_range[0])/self.n[1])
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13 self.create_grid()
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14
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15 def create_grid(self):
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16 self.grid = []
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17 for _ in xrange(self.n[0]):
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18 self.grid.append([set() for _ in xrange(self.n[-1])])
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20 def add(self, geoid, lat, lon):
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21 latlon = (lat, lon)
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22 self[self.index(lat, lon)].add(geoid)
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23
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24 def __getitem__(self, index):
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25 """
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26 index -- 2-tuple or list of i and j indices
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27 """
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28 return self.grid[index[0]][index[1]]
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29
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30 def index(self, lat, lon):
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31 return [int(math.floor((val-self.range[i][0])/self.d[i]))
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32 for i, val in enumerate((lat, lon))]
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33
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34 def neighbors(self, i, j):
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35 """
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36 return neighbors of points i, j
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37 """
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38 imat = [i]
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39 jmat = [j]
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40
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41 # latitude
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42 if i:
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43 imat.append(i-1)
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44 if i < self.n[0]-1:
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45 imat.append(i+1)
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46
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47 # longitude: wraps around
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48 if j:
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49 jmat.append(j-1)
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50 else:
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51 jmat.append(self.n[-1] - 1)
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52 if j == self.n[-1] - 1:
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53 jmat.append(0)
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54 else:
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55 jmat.append(j+1)
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56
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57 return [(_i, _j) for _i in imat for _j in jmat
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58 if (_i,_j) != (i,j)]
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59
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60 def neighbor_points(self, i, j):
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61 """return all points in a lat-lon box"""
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62 geoids = set()
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63 geoids.update(self[(i,j)])
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64 for ii, jj in self.neighbors(i,j):
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65 geoids.update(self[ii,jj])
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66 return geoids
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68 class GriddedLocations(object):
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70 def __init__(self,