/* computes the distance, in meters, along a geometry */
protected static double distanceAlongGeometry(
Geometry geometry, LinearLocation startIndex, LinearLocation endIndex) {
if (endIndex == null) {
endIndex = LinearLocation.getEndLocation(geometry);
}
double total = 0;
LinearIterator it = new LinearIterator(geometry, startIndex);
LinearLocation index = startIndex;
Coordinate previousCoordinate = startIndex.getCoordinate(geometry);
it.next();
index = it.getLocation();
while (index.compareTo(endIndex) < 0) {
Coordinate thisCoordinate = index.getCoordinate(geometry);
double distance = SphericalDistanceLibrary.fastDistance(previousCoordinate, thisCoordinate);
total += distance;
previousCoordinate = thisCoordinate;
if (!it.hasNext()) break;
it.next();
index = it.getLocation();
}
// now, last bit of last segment
Coordinate finalCoordinate = endIndex.getCoordinate(geometry);
total += SphericalDistanceLibrary.distance(previousCoordinate, finalCoordinate);
return total;
}
/** calculate the length of this street segement from its geometry */
protected void calculateLengthFromGeometry() {
double accumulatedMeters = 0;
LineString geom = getGeometry();
for (int i = 1; i < geom.getNumPoints(); i++) {
accumulatedMeters +=
SphericalDistanceLibrary.distance(geom.getCoordinateN(i - 1), geom.getCoordinateN(i));
}
length_mm = (int) (accumulatedMeters * 1000);
}
/**
* Find transfer candidates for profile routing. TODO replace with an on-street search using the
* existing profile router functions.
*/
public Map<StopCluster, Double> findNearbyStopClusters(StopCluster sc, double radius) {
Map<StopCluster, Double> ret = Maps.newHashMap();
Envelope env = new Envelope(new Coordinate(sc.lon, sc.lat));
env.expandBy(
SphericalDistanceLibrary.metersToLonDegrees(radius, sc.lat),
SphericalDistanceLibrary.metersToDegrees(radius));
for (StopCluster cluster : stopClusterSpatialIndex.query(env)) {
// TODO this should account for area-like nature of clusters. Use size of bounding boxes.
double distance = SphericalDistanceLibrary.distance(sc.lat, sc.lon, cluster.lat, cluster.lon);
if (distance < radius) ret.put(cluster, distance);
}
return ret;
}
