How to find nearest cities in a given radius?

Question

Do you know some utility or a web site where I can give US city,state and radial distance in miles as input and it would return me all the cities within that radius?

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Answer 1

Maybe this can help. The project is configured in kilometers though. You can modify these in CityDAO.java

public List findCityInRange(GeoPoint geoPoint, double distance) {
    List cities = new ArrayList();
    QueryBuilder queryBuilder = geoDistanceQuery("geoPoint")
            .point(geoPoint.getLat(), geoPoint.getLon())
            //.distance(distance, DistanceUnit.KILOMETERS) original
            .distance(distance, DistanceUnit.MILES)
            .optimizeBbox("memory")
            .geoDistance(GeoDistance.ARC);

    SearchRequestBuilder builder = esClient.getClient()
            .prepareSearch(INDEX)
            .setTypes("city")
            .setSearchType(SearchType.QUERY_THEN_FETCH)
            .setScroll(new TimeValue(60000))
            .setSize(100).setExplain(true)
            .setPostFilter(queryBuilder)
            .addSort(SortBuilders.geoDistanceSort("geoPoint")
                    .order(SortOrder.ASC)
                    .point(geoPoint.getLat(), geoPoint.getLon())
                    //.unit(DistanceUnit.KILOMETERS)); Original
                    .unit(DistanceUnit.MILES));

    SearchResponse response = builder
            .execute()
            .actionGet();


    SearchHit[] hits = response.getHits().getHits();

    scroll:
    while (true) {

        for (SearchHit hit : hits) {
            Map result = hit.getSource();
            cities.add(mapper.convertValue(result, City.class));
        }

        response = esClient.getClient().prepareSearchScroll(response.getScrollId()).setScroll(new TimeValue(60000)).execute().actionGet();
        if (response.getHits().getHits().length == 0) {
            break scroll;
        }
    }

    return cities;
}

The "LocationFinder\src\main\resources\json\cities.json" file contains all cities from Belgium. You can delete or create entries if you want too. As long as you don't change the names and/or structure, no code changes are required.

Make sure to read the README https://github.com/GlennVanSchil/LocationFinder