Mercurial Hosting > traffic-intelligence
annotate python/indicators.py @ 312:6c068047edbf
merged with Mohamed s work
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Thu, 11 Apr 2013 22:46:33 -0400 |
parents | 93d851d0d21e 8bafd054cda4 |
children | 43e62b9cb652 |
rev | line source |
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1 #! /usr/bin/env python |
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2 '''Class for indicators, temporal indicators, and safety indicators''' |
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3 |
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4 __metaclass__ = type |
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5 |
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6 import moving |
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7 |
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8 # need for a class representing the indicators, their units, how to print them in graphs... |
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9 class TemporalIndicator: |
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10 '''Class for temporal indicators |
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11 i.e. indicators that take a value at specific instants |
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12 |
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13 values should be |
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14 * a dict, for the values at specific time instants |
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15 * or a list with a time interval object if continuous measurements |
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16 |
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17 it should have more information like name, unit''' |
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18 |
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19 def __init__(self, name, values, timeInterval=None, maxValue = None): |
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20 self.name = name |
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21 self.isCosine = (name.find('Cosine') >= 0) |
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22 if timeInterval: |
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23 assert len(values) == timeInterval.length() |
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24 self.timeInterval = timeInterval |
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25 self.values = {} |
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26 for i in xrange(int(round(self.timeInterval.length()))): |
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27 self.values[self.timeInterval[i]] = values[i] |
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28 else: |
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29 self.values = values |
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30 instants = sorted(self.values.keys()) |
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31 if instants: |
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32 self.timeInterval = moving.TimeInterval(instants[0], instants[-1]) |
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33 else: |
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34 self.timeInterval = moving.TimeInterval() |
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35 self.maxValue = maxValue |
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36 |
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37 def __len__(self): |
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38 return len(self.values) |
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39 |
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40 def empty(self): |
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41 return len(self.values) == 0 |
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42 |
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43 def __getitem__(self, i): |
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44 'Returns ith value in time interval' |
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45 if i in self.values.keys(): |
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46 return self.values[i] |
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47 else: |
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48 return None |
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49 |
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50 def getIthValue(self, i): |
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51 sortedKeys = sorted(self.values.keys()) |
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52 if 0<=i<len(sortedKeys): |
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53 return self.values[sortedKeys[i]] |
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54 else: |
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55 return None |
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56 |
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57 def __iter__(self): |
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58 self.iterInstantNum = 0 # index in the interval or keys of the dict |
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59 return self |
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60 |
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61 def next(self): |
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62 if self.iterInstantNum >= len(self.values):#(self.timeInterval and self.iterInstantNum>=self.timeInterval.length())\ |
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63 # or (self.iterInstantNum >= self.values) |
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64 raise StopIteration |
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65 else: |
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66 self.iterInstantNum += 1 |
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67 return self.getIthValue(self.iterInstantNum-1) |
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68 |
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69 def getTimeInterval(self): |
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70 return self.timeInterval |
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71 |
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72 def getValues(self): |
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73 return [self.__getitem__(t) for t in self.timeInterval] |
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74 |
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75 def getAngleValues(self): |
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76 '''if the indicator is a function of an angle, |
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77 transform it to an angle (eg cos) |
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78 (no transformation otherwise)''' |
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79 from numpy import arccos |
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80 values = self.getValues() |
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81 if self.isCosine: |
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82 return [arccos(c) for c in values] |
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83 else: |
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84 return values |
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85 |
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86 def plot(self, options = '', xfactor = 1., **kwargs): |
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87 from matplotlib.pylab import plot,ylim |
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88 if self.getTimeInterval().length() == 1: |
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89 marker = 'o' |
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90 else: |
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91 marker = '' |
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92 time = sorted(self.values.keys()) |
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93 plot([x/xfactor for x in time], [self.values[i] for i in time], options+marker, **kwargs) |
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94 if self.maxValue: |
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95 ylim(ymax = self.maxValue) |
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96 |
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97 def valueSorted(self): |
312 | 98 ''' return the values after sort the keys in the indicator |
99 This should probably not be used: to delete''' | |
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100 values=[] |
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101 keys = self.values.keys() |
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102 keys.sort() |
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103 for key in keys: |
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104 values.append(self.values[key]) |
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105 return values |
312 | 106 |
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107 @staticmethod |
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108 def getDLCSS(TemporalIndicator1,TemporalIndicator2, threshold, delta= np.inf , method='min' ): |
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109 ''' compute the distance between two indicators using LCSS |
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110 two common methods are used: min or mean of the indicators length''' |
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111 l1= TemporalIndicator1.valueSorted |
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112 l2= TemporalIndicator2.valueSorted |
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113 if method = 'min': |
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114 DLCSS= 1- (LCSS(l1,l2, threshold, delta, distance))/min(len(l1),len(l2))) |
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115 if method = 'mean': |
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116 average= len(l1)+len(l2))/2 |
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117 DLCSS= 1- ((LCSS(l1,l2, threshold, delta, distance))/average) |
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118 return DLCSS |
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119 |
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120 |
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121 def computeDLCSS(indicator1, indicator2, threshold, delta = float('inf'), method= 'min'): |
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122 ''' compute the distance between two indicators using LCSS |
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123 two common methods are used: min or mean of the indicators length''' |
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124 from utils import LCSS |
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125 |
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126 def distance(x, y): # lambda x,y:abs(x-y) |
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127 if x == None or y == None: |
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128 return float('inf') |
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129 else: |
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130 return abs(x-y) |
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131 |
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132 lcss = LCSS(indicator1.getValues(), indicator2.getValues(), threshold, distance, delta) |
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133 if method == 'min': |
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134 denominator = min(len(indicator1), len(indicator2)) |
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135 elif method == 'mean': |
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136 denominator = float(len(indicator1) + len(indicator2))/2 |
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137 else: |
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138 print('Unknown denominator method name') |
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139 denominator = 1. |
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140 return 1-float(lcss)/denominator |
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141 |
244
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142 class SeverityIndicator(TemporalIndicator): |
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143 '''Class for severity indicators |
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144 field mostSevereIsMax is True |
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145 if the most severe value taken by the indicator is the maximum''' |
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146 |
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147 def __init__(self, name, values, timeInterval=None, mostSevereIsMax=True, maxValue = None): |
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148 TemporalIndicator.__init__(self, name, values, timeInterval, maxValue) |
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149 self.mostSevereIsMax = mostSevereIsMax |
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150 |
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151 def getMostSevereValue(self, minNInstants=1): # TODO use scoreatpercentile |
244
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152 from matplotlib.mlab import find |
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153 from numpy.core.multiarray import array |
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154 from numpy.core.fromnumeric import mean |
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155 values = array(self.values.values()) |
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156 indices = range(len(values)) |
244
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157 if len(indices) >= minNInstants: |
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158 values = sorted(values[indices], reverse = self.mostSevereIsMax) # inverted if most severe is max -> take the first values |
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159 return mean(values[:minNInstants]) |
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160 else: |
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161 return None |
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162 |
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163 # functions to aggregate discretized maps of indicators |
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164 # TODO add values in the cells between the positions (similar to discretizing vector graphics to bitmap) |
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165 |
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166 def indicatorMap(indicatorValues, trajectory, squareSize): |
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167 '''Returns a dictionary |
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168 with keys for the indices of the cells (squares) |
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169 in which the trajectory positions are located |
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170 at which the indicator values are attached |
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171 |
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172 ex: speeds and trajectory''' |
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173 |
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174 from numpy import floor, mean |
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175 assert len(indicatorValues) == trajectory.length() |
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176 indicatorMap = {} |
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177 for k in xrange(trajectory.length()): |
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178 p = trajectory[k] |
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179 i = floor(p.x/squareSize) |
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180 j = floor(p.y/squareSize) |
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181 if indicatorMap.has_key((i,j)): |
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182 indicatorMap[(i,j)].append(indicatorValues[k]) |
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183 else: |
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184 indicatorMap[(i,j)] = [indicatorValues[k]] |
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185 for k in indicatorMap.keys(): |
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186 indicatorMap[k] = mean(indicatorMap[k]) |
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187 return indicatorMap |
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188 |
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189 def indicatorMapFromPolygon(value, polygon, squareSize): |
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190 '''Fills an indicator map with the value within the polygon |
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191 (array of Nx2 coordinates of the polygon vertices)''' |
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192 import matplotlib.nxutils as nx |
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193 from numpy.core.multiarray import array, arange |
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194 from numpy import floor |
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195 |
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196 points = [] |
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197 for x in arange(min(polygon[:,0])+squareSize/2, max(polygon[:,0]), squareSize): |
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198 for y in arange(min(polygon[:,1])+squareSize/2, max(polygon[:,1]), squareSize): |
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199 points.append([x,y]) |
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200 inside = nx.points_inside_poly(array(points), polygon) |
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201 indicatorMap = {} |
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202 for i in xrange(len(inside)): |
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203 if inside[i]: |
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204 indicatorMap[(floor(points[i][0]/squareSize), floor(points[i][1]/squareSize))] = 0 |
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205 return indicatorMap |
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206 |
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207 def indicatorMapFromAxis(value, limits, squareSize): |
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208 '''axis = [xmin, xmax, ymin, ymax] ''' |
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209 from numpy.core.multiarray import arange |
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210 from numpy import floor |
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211 indicatorMap = {} |
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212 for x in arange(limits[0], limits[1], squareSize): |
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213 for y in arange(limits[2], limits[3], squareSize): |
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214 indicatorMap[(floor(x/squareSize), floor(y/squareSize))] = value |
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215 return indicatorMap |
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216 |
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217 def combineIndicatorMaps(maps, squareSize, combinationFunction): |
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218 '''Puts many indicator maps together |
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219 (averaging the values in each cell |
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220 if more than one maps has a value)''' |
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221 #from numpy import mean |
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222 indicatorMap = {} |
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223 for m in maps: |
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224 for k,v in m.iteritems(): |
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225 if indicatorMap.has_key(k): |
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226 indicatorMap[k].append(v) |
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227 else: |
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228 indicatorMap[k] = [v] |
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229 for k in indicatorMap.keys(): |
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230 indicatorMap[k] = combinationFunction(indicatorMap[k]) |
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231 return indicatorMap |
247
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232 |
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233 if __name__ == "__main__": |
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234 import doctest |
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235 import unittest |
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236 suite = doctest.DocFileSuite('tests/indicators.txt') |
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237 unittest.TextTestRunner().run(suite) |
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238 # #doctest.testmod() |
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239 # #doctest.testfile("example.txt") |