Question

    String loc_expr = "distance(location, geopoint(" + userLatitude + ", " + userLongitude + "))";

    // Build the SortOptions
    SortOptions sortOptions = SortOptions.newBuilder()
            .addSortExpression(SortExpression.newBuilder().setExpression(loc_expr).setDirection(SortExpression.SortDirection.ASCENDING).setDefaultValueNumeric(0))
            .setLimit(200).build();

    // Build the QueryOptions
    QueryOptions options = QueryOptions.newBuilder().addExpressionToReturn(FieldExpression.newBuilder().setExpression(loc_expr).setName("distance")).setLimit(limit)
            .setCursor(cursor).setSortOptions(sortOptions).build();

    String queryString = loc_expr + " < " + searchRadius * 1000;

    // Build the Query and run the search
    Query query = Query.newBuilder().setOptions(options).build(queryString);

    IndexSpec indexSpec = IndexSpec.newBuilder().setName("restaurants").build();
    Index index = SearchServiceFactory.getSearchService().getIndex(indexSpec);

    Results<ScoredDocument> result = index.search(query);
    if (result.getNumberFound() > 0) {
        Collection<ScoredDocument> coll = result.getResults();

        for (ScoredDocument sd : coll) {
            Key<Restaurant> key = Key.create(String.valueOf(sd.getId()));
            Restaurant rest = ofy().load().key(key).now();

            Field f = sd.getExpressions().get(0);
            log.info("distance in meter : " + f.getNumber());
        }
    }

我使用上面提到的代码来获取附近地区的餐馆。以下是我的观察： -

案例1：searchRadius = 0.5 km ---距离最大值= 0.9 km

案例2：searchRadius = 1 km ---距离最大值= 1.8 km

案例3：searchRadius = 2 km ---距离最大值= 2.8 km

案例4：searchRadius = 3 km ---距离最大值= 4.8 km

为什么我得到的距离值更多指定的半径？

注意： - 我不是靠自己计算距离。搜索API返回距离。

Answer 1

这是一个众所周知的issue。

在Google修复之前，您必须在代码中过滤结果

Google AppEngine Search API的距离函数表现得无关紧要

1 个答案: