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# -*- coding: utf8 -*-
"""
Copyright 2014-2016 Andreas Würl
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import math
from abc import ABCMeta, abstractmethod
import pyproj
import shapely.geometry
class Geometry(object):
"""
abstract base class for geometries
"""
__metaclass__ = ABCMeta
__slots__ = ['srid']
DefaultSrid = 4326
def __init__(self, srid=DefaultSrid):
self.srid = srid
def get_srid(self):
return self.srid
def set_srid(self, srid):
self.srid = srid
@property
@abstractmethod
def env(self):
pass
class Envelope(Geometry):
"""
definition of a coordinate envelope
"""
__slots__ = ['x_min', 'x_max', 'y_min', 'y_max']
def __init__(self, x_min, x_max, y_min, y_max, srid=Geometry.DefaultSrid):
super(Envelope, self).__init__(srid)
self.x_min = x_min
self.x_max = x_max
self.y_min = y_min
self.y_max = y_max
@property
def y_delta(self):
return abs(self.y_max - self.y_min)
@property
def x_delta(self):
return abs(self.x_max - self.x_min)
def contains(self, point):
return (point.x >= self.x_min) and \
(point.x <= self.x_max) and \
(point.y >= self.y_min) and \
(point.y <= self.y_max)
@property
def env(self):
return shapely.geometry.LinearRing(
[(self.x_min, self.y_min), (self.x_min, self.y_max), (self.x_max, self.y_max),
(self.x_max, self.y_min)])
def __repr__(self):
return 'Envelope(x: %.4f..%.4f, y: %.4f..%.4f)' % (
self.x_min, self.x_max, self.y_min, self.y_max)
class Grid(Envelope):
""" grid characteristics"""
__slots__ = ['x_div', 'y_div', '__x_bin_count', '__y_bin_count']
def __init__(self, x_min, x_max, y_min, y_max, x_div, y_div, srid=Geometry.DefaultSrid):
super(Grid, self).__init__(x_min, x_max, y_min, y_max, srid)
self.x_div = x_div
self.y_div = y_div
self.__x_bin_count = None
self.__y_bin_count = None
def get_x_bin(self, x_pos):
return int(math.ceil(float(x_pos - self.x_min) / self.x_div)) - 1
def get_y_bin(self, y_pos):
return int(math.ceil(float(y_pos - self.y_min) / self.y_div)) - 1
@property
def x_bin_count(self):
if not self.__x_bin_count:
self.__x_bin_count = self.get_x_bin(self.x_max) + 1
return self.__x_bin_count
@property
def y_bin_count(self):
if not self.__y_bin_count:
self.__y_bin_count = self.get_y_bin(self.y_max) + 1
return self.__y_bin_count
def get_x_center(self, cell_index):
return self.x_min + (cell_index + 0.5) * self.x_div
def get_y_center(self, row_index):
return self.y_min + (row_index + 0.5) * self.y_div
def __repr__(self):
return 'Grid(x: %.4f..%.4f (%.4f, #%d), y: %.4f..%.4f (%.4f, #%d))' % (
self.x_min, self.x_max, self.x_div, self.x_bin_count,
self.y_min, self.y_max, self.y_div, self.y_bin_count)
class GridFactory(object):
WGS84 = pyproj.Proj(init='epsg:4326')
__slots__ = ['min_lon', 'max_lon', 'max_lat', 'min_lat', 'coord_sys', 'grid_data']
def __init__(self, min_lon, max_lon, min_lat, max_lat, coord_sys):
self.min_lon = min_lon
self.max_lon = max_lon
self.min_lat = min_lat
self.max_lat = max_lat
self.coord_sys = coord_sys
self.grid_data = {}
@staticmethod
def fix_max(minimum, maximum, delta):
return minimum + math.floor((maximum - minimum) / delta) * delta
def get_for(self, base_length):
if base_length not in self.grid_data:
ref_lon = (self.min_lon + self.max_lon) / 2.0
ref_lat = (self.min_lat + self.max_lat) / 2.0
utm_x, utm_y = pyproj.transform(self.WGS84, self.coord_sys, ref_lon, ref_lat)
lon_d, lat_d = pyproj.transform(self.coord_sys, self.WGS84, utm_x + base_length, utm_y + base_length)
delta_lon = lon_d - ref_lon
delta_lat = lat_d - ref_lat
max_lon = self.fix_max(self.min_lon, self.max_lon, delta_lon)
max_lat = self.fix_max(self.min_lat, self.max_lat, delta_lat)
self.grid_data[base_length] = Grid(self.min_lon, max_lon, self.min_lat, max_lat,
delta_lon, delta_lat,
Geometry.DefaultSrid)
return self.grid_data[base_length]
class GridElement(object):
"""
raster data entry
"""
__slots__ = ['count', 'timestamp']
def __init__(self, count, timestamp):
self.count = count
self.timestamp = timestamp
def __gt__(self, other):
return self.count > other.count
def __repr__(self):
return "GridElement(%d, %s)" % (self.count, str(self.timestamp))
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