332 lines
14 KiB
Python
332 lines
14 KiB
Python
"""
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Geojson module parses geojson files and import the geometry into the city model structure
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SPDX - License - Identifier: LGPL - 3.0 - or -later
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Copyright © 2022 Concordia CERC group
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Project Coder Guillermo Gutierrez Guillermo.GutierrezMorote@concordia.ca
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"""
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import uuid
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import json
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import numpy as np
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from pyproj import Transformer
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import hub.helpers.constants as cte
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from hub.helpers.geometry_helper import GeometryHelper
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from hub.imports.geometry.helpers.geometry_helper import GeometryHelper as igh
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from hub.city_model_structure.attributes.polygon import Polygon
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from hub.city_model_structure.building import Building
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from hub.city_model_structure.building_demand.surface import Surface
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from hub.city_model_structure.city import City
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class Geojson:
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"""
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Geojson class
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"""
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_X = 0
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_Y = 1
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def __init__(self,
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path,
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aliases_field=None,
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extrusion_height_field=None,
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year_of_construction_field=None,
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function_field=None,
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function_to_hub=None,
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hub_crs=None
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):
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self._hub_crs = hub_crs
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if hub_crs is None :
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self._hub_crs = 'epsg:26911'
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self._transformer = Transformer.from_crs('epsg:4326', self._hub_crs)
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self._min_x = cte.MAX_FLOAT
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self._min_y = cte.MAX_FLOAT
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self._max_x = cte.MIN_FLOAT
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self._max_y = cte.MIN_FLOAT
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self._max_z = 0
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self._city = None
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self._aliases_field = aliases_field
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self._extrusion_height_field = extrusion_height_field
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self._year_of_construction_field = year_of_construction_field
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self._function_field = function_field
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self._function_to_hub = function_to_hub
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with open(path, 'r', encoding='utf8') as json_file:
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self._geojson = json.loads(json_file.read())
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def _save_bounds(self, x, y):
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if x > self._max_x:
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self._max_x = x
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if x < self._min_x:
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self._min_x = x
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if y > self._max_y:
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self._max_y = y
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if y < self._min_y:
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self._min_y = y
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@staticmethod
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def _find_wall(line_1, line_2):
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for i in range(0, 2):
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j = 1 - i
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point_1 = line_1[i]
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point_2 = line_2[j]
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distance = GeometryHelper.distance_between_points(point_1, point_2)
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if distance > 1e-2:
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return False
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return True
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def _store_shared_percentage_to_walls(self, city, city_mapped):
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for building in city.buildings:
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if building.name not in city_mapped.keys():
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for wall in building.walls:
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wall.percentage_shared = 0
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continue
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building_mapped = city_mapped[building.name]
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for wall in building.walls:
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percentage = 0
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ground_line = []
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for point in wall.perimeter_polygon.coordinates:
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if point[2] < 0.5:
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ground_line.append(point)
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for entry in building_mapped:
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if building_mapped[entry]['shared_points'] <= 2:
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continue
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line = [building_mapped[entry]['line_start'], building_mapped[entry]['line_end']]
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neighbour_line = [building_mapped[entry]['neighbour_line_start'],
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building_mapped[entry]['neighbour_line_end']]
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neighbour_height = city.city_object(building_mapped[entry]['neighbour_name']).max_height
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if self._find_wall(line, ground_line):
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line_shared = (GeometryHelper.distance_between_points(line[0], line[1]) +
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GeometryHelper.distance_between_points(neighbour_line[0], neighbour_line[1]) -
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GeometryHelper.distance_between_points(line[1], neighbour_line[0]) -
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GeometryHelper.distance_between_points(line[0], neighbour_line[1])) / 2
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percentage_ground = line_shared / GeometryHelper.distance_between_points(line[0], line[1])
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percentage_height = neighbour_height / building.max_height
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percentage_height = min(percentage_height, 1)
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percentage += percentage_ground * percentage_height
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wall.percentage_shared = percentage
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@property
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def city(self) -> City:
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"""
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Get city out of a Geojson file
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"""
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if self._city is None:
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buildings = []
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lod = 0
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for feature in self._geojson['features']:
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extrusion_height = 0
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if self._extrusion_height_field is not None:
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extrusion_height = float(feature['properties'][self._extrusion_height_field])
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lod = 1
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self._max_z = max(self._max_z, extrusion_height)
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year_of_construction = None
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if self._year_of_construction_field is not None:
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year_of_construction = int(feature['properties'][self._year_of_construction_field])
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function = None
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if self._function_field is not None:
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function = str(feature['properties'][self._function_field])
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if self._function_to_hub is not None:
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# use the transformation dictionary to retrieve the proper function
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if function in self._function_to_hub:
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function = self._function_to_hub[function]
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geometry = feature['geometry']
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building_aliases = []
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if 'id' in feature:
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building_name = feature['id']
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elif 'id' in feature['properties']:
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building_name = feature['properties']['id']
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else:
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building_name = uuid.uuid4()
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if self._aliases_field is not None:
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for alias_field in self._aliases_field:
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building_aliases.append(feature['properties'][alias_field])
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if str(geometry['type']).lower() == 'polygon':
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buildings.append(self._parse_polygon(geometry['coordinates'],
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building_name,
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building_aliases,
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function,
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year_of_construction,
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extrusion_height))
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elif str(geometry['type']).lower() == 'multipolygon':
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buildings.append(self._parse_multi_polygon(geometry['coordinates'],
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building_name,
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building_aliases,
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function,
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year_of_construction,
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extrusion_height))
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else:
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raise NotImplementedError(f'Geojson geometry type [{geometry["type"]}] unknown')
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self._city = City([self._min_x, self._min_y, 0.0], [self._max_x, self._max_y, self._max_z], self._hub_crs)
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for building in buildings:
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# Do not include "small building-like structures" to buildings
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if building.floor_area >= 25:
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self._city.add_city_object(building)
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self._city.level_of_detail.geometry = lod
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for building in self._city.buildings:
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building.level_of_detail.geometry = lod
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if lod > 0:
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lines_information = GeometryHelper.city_mapping(self._city, plot=False)
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self._store_shared_percentage_to_walls(self._city, lines_information)
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return self._city
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def _polygon_coordinates_to_3d(self, polygon_coordinates):
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transformed_coordinates = ''
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for coordinate in polygon_coordinates:
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transformed = self._transformer.transform(coordinate[self._Y], coordinate[self._X])
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self._save_bounds(transformed[self._X], transformed[self._Y])
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transformed_coordinates = f'{transformed_coordinates} {transformed[self._X]} {transformed[self._Y]} 0.0'
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return transformed_coordinates.lstrip(' ')
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def _parse_polygon(self, coordinates, building_name, building_aliases, function, year_of_construction, extrusion_height):
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surfaces = []
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for polygon_coordinates in coordinates:
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points = igh.points_from_string(
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igh.remove_last_point_from_string(
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self._polygon_coordinates_to_3d(polygon_coordinates)
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)
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)
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points = igh.invert_points(points)
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polygon = Polygon(points)
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polygon.area = igh.ground_area(points)
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surface = Surface(polygon, polygon)
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if surface.type == cte.GROUND:
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surfaces.append(surface)
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else:
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distance = cte.MAX_FLOAT
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hole_connect = 0
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surface_connect = 0
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for hole_index, hole_coordinate in enumerate(polygon.coordinates):
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for surface_index, ground_coordinate in enumerate(surfaces[-1].solid_polygon.coordinates):
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current_distance = GeometryHelper.distance_between_points(hole_coordinate, ground_coordinate)
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if current_distance < distance:
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distance = current_distance
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hole_connect = hole_index
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surface_connect = surface_index
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hole = polygon.coordinates[hole_connect:] + polygon.coordinates[:hole_connect] + [polygon.coordinates[hole_connect]]
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prefix_coordinates = surfaces[-1].solid_polygon.coordinates[:surface_connect+1]
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trail_coordinates = surfaces[-1].solid_polygon.coordinates[surface_connect:]
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coordinates = prefix_coordinates + hole + trail_coordinates
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polygon = Polygon(coordinates)
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polygon.area = igh.ground_area(coordinates)
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surfaces[-1] = Surface(polygon, polygon)
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building = Building(f'{building_name}', surfaces, year_of_construction, function)
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for alias in building_aliases:
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building.add_alias(alias)
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if extrusion_height == 0:
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return building
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volume = 0
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for ground in building.grounds:
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volume += ground.solid_polygon.area * extrusion_height
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roof_coordinates = []
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# adding a roof means invert the polygon coordinates and change the Z value
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for coordinate in ground.solid_polygon.coordinates:
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roof_coordinate = np.array([coordinate[0], coordinate[1], extrusion_height])
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# insert the roof rotated already
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roof_coordinates.insert(0, roof_coordinate)
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roof_polygon = Polygon(roof_coordinates)
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roof_polygon.area = ground.solid_polygon.area
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roof = Surface(roof_polygon, roof_polygon)
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surfaces.append(roof)
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# adding a wall means add the point coordinates and the next point coordinates with Z's height and 0
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coordinates_length = len(roof.solid_polygon.coordinates)
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for i, coordinate in enumerate(roof.solid_polygon.coordinates):
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j = i + 1
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if j == coordinates_length:
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j = 0
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next_coordinate = roof.solid_polygon.coordinates[j]
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wall_coordinates = [
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np.array([coordinate[0], coordinate[1], 0.0]),
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np.array([next_coordinate[0], next_coordinate[1], 0.0]),
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np.array([next_coordinate[0], next_coordinate[1], next_coordinate[2]]),
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np.array([coordinate[0], coordinate[1], coordinate[2]])
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]
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polygon = Polygon(wall_coordinates)
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wall = Surface(polygon, polygon)
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surfaces.append(wall)
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building = Building(f'{building_name}', surfaces, year_of_construction, function)
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for alias in building_aliases:
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building.add_alias(alias)
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building.volume = volume
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return building
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def _parse_multi_polygon(self, polygons_coordinates, building_name, building_aliases, function, year_of_construction, extrusion_height):
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surfaces = []
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for coordinates in polygons_coordinates:
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for polygon_coordinates in coordinates:
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points = igh.points_from_string(
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igh.remove_last_point_from_string(
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self._polygon_coordinates_to_3d(polygon_coordinates)
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)
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)
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points = igh.invert_points(points)
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polygon = Polygon(points)
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polygon.area = igh.ground_area(points)
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surface = Surface(polygon, polygon)
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if surface.type == cte.GROUND:
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surfaces.append(surface)
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else:
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distance = cte.MAX_FLOAT
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hole_connect = 0
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surface_connect = 0
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for hole_index, hole_coordinate in enumerate(polygon.coordinates):
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for surface_index, ground_coordinate in enumerate(surfaces[-1].solid_polygon.coordinates):
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current_distance = GeometryHelper.distance_between_points(hole_coordinate, ground_coordinate)
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if current_distance < distance:
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distance = current_distance
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hole_connect = hole_index
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surface_connect = surface_index
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hole = polygon.coordinates[hole_connect:] + polygon.coordinates[:hole_connect]
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prefix_coordinates = surfaces[-1].solid_polygon.coordinates[:surface_connect]
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trail_coordinates = surfaces[-1].solid_polygon.coordinates[surface_connect:]
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coordinates = prefix_coordinates + hole + [hole[0]] + trail_coordinates
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polygon = Polygon(coordinates)
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polygon.area = igh.ground_area(coordinates)
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surfaces[-1] = Surface(polygon, polygon)
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building = Building(f'{building_name}', surfaces, year_of_construction, function)
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for alias in building_aliases:
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building.add_alias(alias)
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if extrusion_height == 0:
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return building
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volume = 0
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for ground in building.grounds:
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volume += ground.solid_polygon.area * extrusion_height
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roof_coordinates = []
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# adding a roof means invert the polygon coordinates and change the Z value
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for coordinate in ground.solid_polygon.coordinates:
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roof_coordinate = np.array([coordinate[0], coordinate[1], extrusion_height])
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# insert the roof rotated already
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roof_coordinates.insert(0, roof_coordinate)
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roof_polygon = Polygon(roof_coordinates)
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roof_polygon.area = ground.solid_polygon.area
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roof = Surface(roof_polygon, roof_polygon)
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surfaces.append(roof)
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# adding a wall means add the point coordinates and the next point coordinates with Z's height and 0
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coordinates_length = len(roof.solid_polygon.coordinates)
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for i, coordinate in enumerate(roof.solid_polygon.coordinates):
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j = i + 1
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if j == coordinates_length:
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j = 0
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next_coordinate = roof.solid_polygon.coordinates[j]
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wall_coordinates = [
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np.array([coordinate[0], coordinate[1], 0.0]),
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np.array([next_coordinate[0], next_coordinate[1], 0.0]),
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np.array([next_coordinate[0], next_coordinate[1], next_coordinate[2]]),
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np.array([coordinate[0], coordinate[1], coordinate[2]])
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]
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polygon = Polygon(wall_coordinates)
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wall = Surface(polygon, polygon)
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surfaces.append(wall)
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building = Building(f'{building_name}', surfaces, year_of_construction, function)
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for alias in building_aliases:
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building.add_alias(alias)
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building.volume = volume
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return building
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