Expose component size variable as command-line option (this allows testing of big/small components in cucumber tests).

Add ability to pass extra parameters to  during tests.
Limit distance table search so that it doesn't return any big components if they're beyond max_distance.

extractor/extractor.cpp

@@ -436,7 +436,7 @@ void extractor::FindComponents(unsigned max_edge_id,
                          component_search.get_component_id(node.reverse_edge_based_node_id));
 
         const unsigned component_size = component_search.get_component_size(forward_component);
-        node.component.is_tiny = component_size < 1000;
+        node.component.is_tiny = component_size < config.small_component_size;
         node.component.id = 1 + forward_component;
     }
 }

extractor/extractor_options.cpp

@@ -64,7 +64,11 @@ ExtractorOptions::ParseArguments(int argc, char *argv[], ExtractorConfig &extrac
         "Number of threads to use")(
             "generate-edge-lookup",boost::program_options::value<bool>(
                                                 &extractor_config.generate_edge_lookup)->implicit_value(true)->default_value(false),
-                                 "Generate a lookup table for internal edge-expanded-edge IDs to OSM node pairs");
+                                 "Generate a lookup table for internal edge-expanded-edge IDs to OSM node pairs")(
+        "small-component-size",
+        boost::program_options::value<unsigned int>(&extractor_config.small_component_size)
+            ->default_value(1000),
+        "Number of nodes required before a strongly-connected-componennt is considered big (affects nearest neighbor snapping)");
 
 #ifdef DEBUG_GEOMETRY
         config_options.add_options()("debug-turns",

extractor/extractor_options.hpp

@@ -58,6 +58,7 @@ struct ExtractorConfig
     std::string rtree_leafs_output_path;
 
     unsigned requested_num_threads;
+    unsigned small_component_size;
 
     bool generate_edge_lookup;
     std::string edge_penalty_path;