Contains the weights,durations,distances of EdgeBasedNodes.
tar -tvf nevada-latest.osrm.enw
-rw-rw-r-- 0/0 8 1970-01-01 00:00 osrm_fingerprint.meta
-rw-rw-r-- 0/0 8 1970-01-01 00:00 /extractor/edge_based_node_weights.meta
-rw-rw-r-- 0/0 2914988 1970-01-01 00:00 /extractor/edge_based_node_weights
-rw-rw-r-- 0/0 8 1970-01-01 00:00 /extractor/edge_based_node_durations.meta
-rw-rw-r-- 0/0 2914988 1970-01-01 00:00 /extractor/edge_based_node_durations
-rw-rw-r-- 0/0 8 1970-01-01 00:00 /extractor/edge_based_node_distances.meta
-rw-rw-r-- 0/0 2914988 1970-01-01 00:00 /extractor/edge_based_node_distances
Edge based node weights/durations/distances data will be constructed and write into .osrm.enw file during extracting. As below processing in Extractor::run(), the data will be generated when build edge expanded graph.
int Extractor::run(ScriptingEnvironment &scripting_environment)
{
// ...
// [Jay] the data write to .osrm.enw file
std::vector<EdgeWeight> edge_based_node_weights;
std::vector<EdgeDuration> edge_based_node_durations;
std::vector<EdgeDistance> edge_based_node_distances;
// ...
// [Jay] construct the data when build edge expanded graph
const auto number_of_edge_based_nodes =
BuildEdgeExpandedGraph(node_based_graph,
coordinates,
node_based_graph_factory.GetCompressedEdges(),
barrier_nodes,
traffic_signals,
turn_restrictions,
conditional_turn_restrictions,
segregated_edges,
name_table,
unresolved_maneuver_overrides,
turn_lane_map,
scripting_environment,
edge_based_nodes_container,
edge_based_node_segments,
edge_based_node_weights,
edge_based_node_durations,
edge_based_node_distances,
edge_based_edge_list,
ebg_connectivity_checksum);
// ...
// [Jay] Write the data to .osrm.enw file
util::Log() << "Saving edge-based node weights to file.";
TIMER_START(timer_write_node_weights);
extractor::files::writeEdgeBasedNodeWeightsDurationsDistances(config.GetPath(".osrm.enw"),
edge_based_node_weights,
edge_based_node_durations,
edge_based_node_distances);
// ...
More specificly, the data will be constructed from compressed node based graph but renumberred, see EdgeBasedGraphFactory::LabelEdgeBasedNodes(). The mapping bewteen compressed_node_based_edge and edge_based_node will be generated in EdgeBasedGraphFactory::InsertEdgeBasedNode, which will be written in to .osrm.cnbg_to_ebg eventually.
One more special thing in .osrm.enw is that the weight value might be negative, which is a little counter-intuitive. It becauses the MSB - Most significant bit of weight will be used to distinguish oneway street in implementation.
// ⚠ Use the sign bit of node weights to distinguish oneway streets:
// * MSB is set - a node corresponds to a one-way street
// * MSB is clear - a node corresponds to a bidirectional street
// Before using node weights data values must be adjusted:
// * in contraction if MSB is set the node weight is INVALID_EDGE_WEIGHT.
// This adjustment is needed to enforce loop creation for oneways.
// * in other cases node weights must be masked with 0x7fffffff to clear MSB
if (nbe_to_ebn_mapping[edge_id_1] != SPECIAL_NODEID &&
nbe_to_ebn_mapping[edge_id_2] == SPECIAL_NODEID)
m_edge_based_node_weights[nbe_to_ebn_mapping[edge_id_1]] |= 0x80000000;