partial geojson implementation

imports/geometry/citygml.py

@@ -64,6 +64,9 @@ class CityGml:
             self._upper_corner = np.fromstring(envelope['upperCorner'], dtype=float, sep=' ')
           if '@srsName' in envelope:
             self._srs_name = envelope['@srsName']
+          else:
+            # If not coordinate system given assuming hub standard
+            self._srs_name = "EPSG:4326"
       else:
         # get the boundary from the city objects instead
         for city_object_member in self._gml['CityModel']['cityObjectMember']:

imports/geometry/geojson.py

@@ -0,0 +1,110 @@
+"""
+Geojson module parses geojson files and import the geometry into the city model structure
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Guillermo Gutierrez Guillermo.GutierrezMorote@concordia.ca
+"""
+
+import trimesh
+import trimesh.exchange.load
+import trimesh.geometry
+import trimesh.creation
+import trimesh.repair
+from shapely.geometry import Point
+from shapely.geometry import Polygon as ShapelyPoly
+from trimesh import Scene
+
+from city_model_structure.attributes.polygon import Polygon
+from city_model_structure.building import Building
+from city_model_structure.building_demand.surface import Surface
+from city_model_structure.city import City
+
+import helpers.constants as cte
+
+
+class Geojson:
+  """
+  GeoPandas class
+  """
+
+  def __init__(self, path):
+    """
+    """
+
+    self._srs_name = srs_name
+    self._city = None
+    self._scene = dataframe
+    self._scene = self._scene.to_crs(self._srs_name)
+    min_x, min_y, max_x, max_y = self._scene.total_bounds
+    self._lower_corner = [min_x, min_y, 0]
+    self._upper_corner = [max_x, max_y, 0]
+
+  @property
+  def scene(self) -> Scene:
+    """
+    Get GeoPandas scene
+    """
+    return self._scene
+
+  @property
+  def city(self) -> City:
+    """
+    Get city out of a GeoPandas Table
+    """
+    if self._city is None:
+      self._city = City(self._lower_corner, self._upper_corner, self._srs_name)
+      for scene_index, bldg in self._scene.iterrows():
+        geom = bldg.geom
+        polygon = ShapelyPoly(geom['coordinates'][0])
+        height = float(bldg['height_mean'])
+        building_mesh = trimesh.creation.extrude_polygon(polygon, height)
+        trimesh.repair.fill_holes(building_mesh)
+        trimesh.repair.fix_winding(building_mesh)
+        year_of_construction = int(bldg['year_built'])
+        name = str(scene_index)
+        lod = 1
+        if year_of_construction > 2000:
+          function = cte.RESIDENTIAL
+        else:
+          function = cte.INDUSTRY
+
+        surfaces = []
+        for face_index, face in enumerate(building_mesh.faces):
+          points = []
+          for vertex_index in face:
+            points.append(building_mesh.vertices[vertex_index])
+          solid_polygon = Polygon(points)
+          perimeter_polygon = solid_polygon
+          surface = Surface(solid_polygon, perimeter_polygon)
+          surfaces.append(surface)
+        building = Building(name, lod, surfaces, year_of_construction, function, self._lower_corner, terrains=None)
+        self._city.add_city_object(building)
+    return self._city
+
+  @staticmethod
+  def resize_polygon(poly, factor=0.10, expand=False) -> ShapelyPoly:
+    """
+    returns the shapely polygon which is smaller or bigger by passed factor.
+    Arguments:
+    poly {shapely.geometry.Polygon} -- an input geometry in shapely polygon format
+
+    Keyword Arguments:
+      factor {float} -- factor of expansion (default: {0.10})
+      expand {bool} -- If expand = True , then it returns bigger polygon, else smaller (default: {False})
+
+    Returns:
+      {shapely.geometry.Polygon} -- output geometry in shapely polygon format
+    """
+    xs = list(poly.exterior.coords.xy[0])
+    ys = list(poly.exterior.coords.xy[1])
+    x_center = 0.5 * min(xs) + 0.5 * max(xs)
+    y_center = 0.5 * min(ys) + 0.5 * max(ys)
+    min_corner = Point(min(xs), min(ys))
+    center = Point(x_center, y_center)
+    shrink_distance = center.distance(min_corner) * factor
+
+    if expand:
+      poly_resized = poly.buffer(shrink_distance)  # expand
+    else:
+      poly_resized = poly.buffer(-shrink_distance)  # shrink
+    return poly_resized

imports/geometry_factory.py

@@ -48,6 +48,16 @@ class GeometryFactory:
       self._data_frame = geopandas.read_file(self._path)
     return GPandas(self._data_frame).city
 
+  @property
+  def _geojson(self) -> City:
+    """
+    Enrich the city by using Geojson information as data source
+    :return: City
+    """
+    if self._data_frame is None:
+      self._data_frame = geopandas.read_file(self._path)
+    return Geojson(self._data_frame).city
+
   @property
   def _osm_subway(self) -> City:
     """