backend/src/sandbox/get_streets.py

@@ -13,6 +13,7 @@ from math import sin, cos, sqrt, atan2, radians
 
 EARTH_RADIUS_KM = 6373
 
+
 class ShoppingLocation(BaseModel):
     type: Literal['street', 'area']
     importance: int
@@ -21,7 +22,6 @@ class ShoppingLocation(BaseModel):
     end: Optional[list] = None
 
 
-
 # Output to frontend
 class Landmark(BaseModel) :
     # Properties of the landmark
@@ -206,7 +206,7 @@ def create_landmark(shopping_location: ShoppingLocation):
     # CachingStrategy.use(JSON, cacheDir=OSM_CACHE_DIR)
 
     # Query neighborhoods and shopping malls
-    selectors = ['"place"~"^(suburb|neighborhood|city_block)$"', '"shop"="mall"']
+    selectors = ['"place"~"^(suburb|neighborhood|neighbourhood|quarter|city_block)$"', '"shop"="mall"']
 
     min_dist = float('inf')
     new_name = 'Shopping Area'
@@ -220,22 +220,22 @@ def create_landmark(shopping_location: ShoppingLocation):
             elementType = ['node', 'way', 'relation'],
             selector = sel,
             includeCenter = True,
-            out = 'body'
+            out = 'center'
         )
 
         try:
             result = overpass.query(query)
-            # print(f'query OK with {len(result.elements())} elements')
         except Exception as e:
             raise Exception("query unsuccessful")
 
         for elem in result.elements():
 
-            location = (elem.lat(), elem.lon())
+            location = (elem.centerLat(), elem.centerLon())
 
             if location[0] is None : 
-                location = (elem.centerLat(), elem.centerLon())
+                location = (elem.lat(), elem.lon())
                 if location[0] is None : 
+                    # print(f"Fetching coordinates failed with {elem.type()}/{elem.id()}")
                     continue
 
             # print(f"Distance : {get_distance(shopping_location.centroid, location)}")
@@ -246,8 +246,6 @@ def create_landmark(shopping_location: ShoppingLocation):
                 osm_type = elem.type()              # Add type: 'way' or 'relation'
                 osm_id = elem.id()                  # Add OSM id 
 
-                # print("closer thing found")
-
                 # add english name if it exists
                 try :
                     new_name_en = elem.tag('name:en')
@@ -267,7 +265,7 @@ def create_landmark(shopping_location: ShoppingLocation):
 
 
 # Extract points
-points = extract_points('newyork_data.json')
+points = extract_points('vienna_data.json')
 
 # print(len(points))
 
@@ -311,9 +309,13 @@ axes[2].set_title('PCA Fitted Lines on Clusters')
 # Create a list of Landmarks for the shopping things
 shopping_landmarks = []
 for loc in locations :
-    axes[2].scatter(loc.centroid[0], loc.centroid[1], color='lime', marker='x', s=200, linewidth=3)
+    axes[2].scatter(loc.centroid[1], loc.centroid[0], color='red', marker='x', s=200, linewidth=3)
     landmark = create_landmark(loc)
     shopping_landmarks.append(landmark)
+    axes[2].text(loc.centroid[1], loc.centroid[0], landmark.name, 
+             ha='center', va='top', fontsize=6, 
+             bbox=dict(facecolor='white', edgecolor='black', boxstyle='round,pad=0.2'),
+             zorder=3)
     
     
 

backend/src/utils/cluster_processing.py

@@ -0,0 +1,165 @@
+import logging, yaml
+from typing import Optional, Literal
+
+import numpy as np
+from sklearn.cluster import DBSCAN
+from sklearn.decomposition import PCA
+from pydantic import BaseModel
+from OSMPythonTools.overpass import Overpass, overpassQueryBuilder
+from OSMPythonTools.cachingStrategy import CachingStrategy, JSON
+
+from ..structs.landmark import Landmark
+from ..structs.preferences import Preferences
+from ..utils.get_time_separation import get_distance
+from ..constants import AMENITY_SELECTORS_PATH, LANDMARK_PARAMETERS_PATH, OPTIMIZER_PARAMETERS_PATH, OSM_CACHE_DIR
+
+
+class ShoppingLocation(BaseModel):
+    type: Literal['street', 'area']
+    importance: int
+    centroid: tuple
+    start: Optional[list] = None
+    end: Optional[list] = None
+
+
+class ShoppingManager:
+
+    logger = logging.getLogger(__name__)
+
+
+    def __init__(self) -> None:
+
+        with OPTIMIZER_PARAMETERS_PATH.open('r') as f:
+                parameters = yaml.safe_load(f)
+                self.walking_speed = parameters['average_walking_speed']
+                self.detour_factor = parameters['detour_factor']
+
+        self.overpass = Overpass()
+        CachingStrategy.use(JSON, cacheDir=OSM_CACHE_DIR)
+
+
+    def generate_landmarks_list(self, center_coordinates: tuple[float, float], preferences: Preferences) :
+
+        max_walk_dist = (preferences.max_time_minute/2)/60*self.walking_speed*1000/self.detour_factor
+        reachable_bbox_side = min(max_walk_dist, self.max_bbox_side)
+
+        # use set to avoid duplicates, this requires some __methods__ to be set in Landmark
+        shopping_landmarks = set()
+
+        # Create a bbox using the around technique.
+        bbox = tuple((f"around:{reachable_bbox_side/2}", str(center_coordinates[0]), str(center_coordinates[1])))
+        # list for sightseeing
+
+
+def get_clusters(points: list) -> tuple:
+    """
+    Apply DBSCAN to find clusters.
+    """
+    if len(points) > 400 :
+        dbscan = DBSCAN(eps=0.00118, min_samples=15, algorithm='kd_tree')  # for large cities
+    else :
+        dbscan = DBSCAN(eps=0.00075, min_samples=10, algorithm='kd_tree')  # for small cities
+
+    labels = dbscan.fit_predict(points)
+
+    # Separate clustered points and noise points
+    clustered_points = points[labels != -1]
+    clustered_labels = labels[labels != -1]
+
+    return clustered_points, clustered_labels
+
+
+
+def filter_clusters(cluster_points, cluster_labels):
+    """
+    Remove clusters of less importance.
+    """
+    label_counts = np.bincount(cluster_labels)
+
+    # Step 3: Get the indices (labels) of the 5 largest clusters
+    top_5_labels = np.argsort(label_counts)[-5:]  # Get the largest 5 clusters
+
+    # Step 4: Filter points to keep only the points in the top 5 clusters
+    filtered_cluster_points = []
+    filtered_cluster_labels = []
+
+    for label in top_5_labels:
+        filtered_cluster_points.append(cluster_points[cluster_labels == label])
+        filtered_cluster_labels.append(np.full((label_counts[label],), label))  # Replicate the label
+
+    # Concatenate filtered clusters into a single array
+    return np.vstack(filtered_cluster_points), np.concatenate(filtered_cluster_labels)
+
+
+def fit_lines(points, labels):
+    """
+    Fit lines to identified clusters.
+    """
+    all_x = []
+    all_y = []
+    lines = []
+    locations = []
+
+    for label in set(labels):
+        cluster_points = points[labels == label]
+
+        # If there's not enough points, skip
+        if len(cluster_points) < 2:
+            continue
+
+        # Apply PCA to find the principal component (i.e., the line of best fit)
+        pca = PCA(n_components=1)
+        pca.fit(cluster_points)
+
+        direction = pca.components_[0]
+        centroid = pca.mean_
+
+        # Project the cluster points onto the principal direction (line direction)
+        projections = np.dot(cluster_points - centroid, direction)
+
+        # Get the range of the projections to find the approximate length of the cluster
+        cluster_length = projections.max() - projections.min()
+
+        # Now adjust `t` so that it scales with the cluster length
+        t = np.linspace(-cluster_length / 2.75, cluster_length / 2.75, 10)
+
+        # Calculate the start and end of the line based on min/max projections
+        start_point = centroid[0] + t*direction[0]
+        end_point = centroid[1] + t*direction[1]
+        
+        # Store the line
+        lines.append((start_point, end_point))
+
+        # For visualization, store the points
+        all_x.append(min(start_point))
+        all_x.append(max(start_point))
+        all_y.append(min(end_point))
+        all_y.append(max(end_point))
+
+        if np.linalg.norm(t) <= 0.0045 :
+            loc = ShoppingLocation(
+                type='area',
+                centroid=tuple((centroid[1], centroid[0])),
+                importance = len(cluster_points),
+            )
+        else :
+            loc = ShoppingLocation(
+                type='street',
+                centroid=tuple((centroid[1], centroid[0])),
+                importance = len(cluster_points),
+                start=start_point,
+                end=end_point
+            )
+
+        locations.append(loc)
+
+    xmin = min(all_x)
+    xmax = max(all_x)
+    ymin = min(all_y)
+    ymax = max(all_y)
+    corners = (xmin, xmax, ymin, ymax)
+
+    return corners, locations
+
+
+

backend/src/utils/landmarks_manager.py

@@ -1,7 +1,4 @@
-import math
-import yaml
-import logging
-
+import math, yaml, logging
 from OSMPythonTools.overpass import Overpass, overpassQueryBuilder
 from OSMPythonTools.cachingStrategy import CachingStrategy, JSON
 
@@ -79,7 +76,7 @@ class LandmarkManager:
         # use set to avoid duplicates, this requires some __methods__ to be set in Landmark
         all_landmarks = set()
 
-        # Create a bbox using the around
+        # Create a bbox using the around technique
         bbox = tuple((f"around:{reachable_bbox_side/2}", str(center_coordinates[0]), str(center_coordinates[1])))
         # list for sightseeing
         if preferences.sightseeing.score != 0:
@@ -219,7 +216,7 @@ class LandmarkManager:
                 selector = sel,
                 conditions = query_conditions,        # except for nature....
                 includeCenter = True,
-                out = 'body'
+                out = 'center'
                 )
             self.logger.debug(f"Query: {query}")