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import sys |
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import os |
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import math |
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from timeit import default_timer as timer |
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from multiprocessing import Process, Queue |
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import numpy |
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from scipy.spatial import KDTree |
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import matplotlib.pyplot as plt |
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from matplotlib.figure import Figure |
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from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas |
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import geojson |
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import geojsoncontour |
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import nsmaps |
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from nsmaps.logger import logger |
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def dotproduct(v1, v2): |
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return sum((a * b) for a, b in zip(v1, v2)) |
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def length(v): |
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return math.sqrt(dotproduct(v, v)) |
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def angle(v1, v2): |
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return math.acos(dotproduct(v1, v2) / (length(v1) * length(v2))) |
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class ContourData(object): |
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def __init__(self): |
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self.Z = None |
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self.index_begin = 0 |
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class ContourPlotConfig(object): |
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def __init__(self): |
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self.stepsize_deg = 0.005 |
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self.n_processes = 4 |
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self.cycle_speed_kmh = 18.0 |
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self.n_nearest = 20 |
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self.lon_start = 3.0 |
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self.lat_start = 50.5 |
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self.delta_deg = 6.5 |
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self.lon_end = self.lon_start + self.delta_deg |
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self.lat_end = self.lat_start + self.delta_deg / 2.0 |
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self.min_angle_between_segments = 7 |
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def print_bounding_box(self): |
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print( |
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'[[' + str(self.lon_start) + ',' + str(self.lat_start) + '],' |
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'[' + str(self.lon_start) + ',' + str(self.lat_end) + '],' |
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'[' + str(self.lon_end) + ',' + str(self.lat_end) + '],' |
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'[' + str(self.lon_end) + ',' + str(self.lat_start) + '],' |
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'[' + str(self.lon_start) + ',' + str(self.lat_start) + ']]' |
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) |
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class TestConfig(ContourPlotConfig): |
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def __init__(self): |
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super().__init__() |
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self.stepsize_deg = 0.005 |
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self.n_processes = 4 |
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self.lon_start = 4.8 |
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self.lat_start = 52.0 |
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self.delta_deg = 1.0 |
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self.lon_end = self.lon_start + self.delta_deg |
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self.lat_end = self.lat_start + self.delta_deg / 2.0 |
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self.min_angle_between_segments = 7 |
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self.latrange = [] |
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self.lonrange = [] |
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self.Z = [[]] |
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class Contour(object): |
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def __init__(self, departure_station, stations, config): |
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self.departure_station = departure_station |
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self.stations = stations |
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self.config = config |
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def create_contour_data(self): |
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logger.info('BEGIN') |
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if self.departure_station.has_travel_time_data(): |
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self.stations.travel_times_from_json(self.departure_station.get_travel_time_filepath()) |
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else: |
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logger.error('Input file ' + self.departure_station.get_travel_time_filepath() + ' not found. Skipping station.') |
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start = timer() |
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numpy.set_printoptions(3, threshold=100, suppress=True) # .3f |
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altitude = 0.0 |
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self.lonrange = numpy.arange(self.config.lon_start, self.config.lon_end, self.config.stepsize_deg) |
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self.latrange = numpy.arange(self.config.lat_start, self.config.lat_end, self.config.stepsize_deg / 2.0) |
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self.Z = numpy.zeros((int(self.lonrange.shape[0]), int(self.latrange.shape[0]))) |
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gps = nsmaps.utilgeo.GPS() |
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positions = [] |
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for station in self.stations: |
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x, y, z = gps.lla2ecef([station.get_lat(), station.get_lon(), altitude]) |
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positions.append([x, y, z]) |
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logger.info('starting spatial interpolation') |
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# tree to find nearest neighbors |
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tree = KDTree(positions) |
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111
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queue = Queue() |
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processes = [] |
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if self.config.n_nearest > len(self.stations): |
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self.config.n_nearest = len(self.stations) |
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latrange_per_process = int(len(self.latrange)/self.config.n_processes) |
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for i in range(0, self.config.n_processes): |
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begin = i * latrange_per_process |
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end = (i+1) * latrange_per_process |
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latrange_part = self.latrange[begin:end] |
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process = Process(target=self.interpolate_travel_time, args=(queue, i, self.stations.stations, tree, gps, latrange_part, |
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self.lonrange, altitude, self.config.n_nearest, self.config.cycle_speed_kmh)) |
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processes.append(process) |
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for process in processes: |
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process.start() |
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# get from the queue and append the values |
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for i in range(0, self.config.n_processes): |
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data = queue.get() |
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index_begin = data.index_begin |
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begin = int(index_begin*len(self.latrange)/self.config.n_processes) |
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end = int((index_begin+1)*len(self.latrange)/self.config.n_processes) |
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self.Z[0:][begin:end] = data.Z |
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for process in processes: |
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process.join() |
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end = timer() |
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logger.info('finished spatial interpolation in ' + str(end - start) + ' [sec]') |
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logger.info('END') |
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@property |
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def data_filename(self): |
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return 'data/contour_data_' + self.departure_station.get_code() + '.npz' |
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def load(self): |
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with open(self.data_filename, 'rb') as filein: |
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self.Z = numpy.load(filein) |
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def save(self): |
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with open(self.data_filename, 'wb') as fileout: |
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numpy.save(fileout, self.Z) |
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def create_geojson(self, filepath, stroke_width=1, levels=[], norm=None, overwrite=False): |
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if not overwrite and os.path.exists(filepath): |
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logger.error('Output file ' + filepath + ' already exists. Will not override.') |
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return |
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159
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figure = Figure(frameon=False) |
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FigureCanvas(figure) |
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ax = figure.add_subplot(111) |
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# contours = plt.contourf(lonrange, latrange, Z, levels=levels, cmap=plt.cm.plasma) |
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contours = ax.contour( |
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self.lonrange, self.latrange, self.Z, |
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levels=levels, |
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norm=norm, |
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cmap=plt.cm.jet, |
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linewidths=3 |
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) |
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ndigits = len(str(int(1.0 / self.config.stepsize_deg))) + 1 |
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logger.info('converting contour to geojson file: ' + filepath) |
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geojsoncontour.contour_to_geojson( |
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contour=contours, |
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geojson_filepath=filepath, |
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contour_levels=levels, |
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min_angle_deg=self.config.min_angle_between_segments, |
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ndigits=ndigits, |
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unit='min', |
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stroke_width=stroke_width |
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) |
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183
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cbar = figure.colorbar(contours, format='%d', orientation='horizontal') |
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cbar.set_label('Travel time [minutes]') |
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# cbar.set_ticks(self.config.colorbar_ticks) |
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ax.set_visible(False) |
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figure.savefig( |
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filepath.replace('.geojson', '') + "_colorbar.png", |
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dpi=90, |
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bbox_inches='tight', |
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pad_inches=0, |
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transparent=True, |
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) |
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@staticmethod |
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def interpolate_travel_time(q, position, stations, kdtree, gps, latrange, lonrange, altitude, n_nearest, cycle_speed_kmh): |
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# n_nearest: check N nearest stations as best start for cycle route |
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logger.info('interpolate_travel_time') |
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Z = numpy.zeros((int(latrange.shape[0]), int(lonrange.shape[0]))) |
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for i, lat in enumerate(latrange): |
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if i % (len(latrange) / 10) == 0: |
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logger.debug(str(int(i / len(latrange) * 100)) + '%') |
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for j, lon in enumerate(lonrange): |
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x, y, z = gps.lla2ecef([lat, lon, altitude]) |
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distances, indexes = kdtree.query([x, y, z], n_nearest) |
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min_travel_time = sys.float_info.max |
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for distance, index in zip(distances, indexes): |
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if stations[index].travel_time_min is None: |
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continue |
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travel_time = stations[index].travel_time_min + distance / 1000.0 / cycle_speed_kmh * 60.0 |
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if travel_time < min_travel_time: |
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min_travel_time = travel_time |
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Z[i][j] = min_travel_time |
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data = ContourData() |
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data.index_begin = position |
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data.Z = Z |
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q.put(data) |
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logger.info('end interpolate_travel_time') |
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return |
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bartromgens /
nsmaps
