Lucene.Net排序距离点的结果

Question

我试图搜索特定半径内的结果，并根据距离点（接近第一个，最后一个）的距离对结果进行排序。 但是，返回的结果出现在相反的排序中（远远居第一位，接近尾数）。

这里是我的代码：

string name = "__Location"; 
var strategy = new PointVectorStrategy(ctx, name); 

var indexSearcher = new IndexSearcher(_dir, true); 

double radious = Double.Parse(rad); 

double lat = 33.8886290; 
double lng = 35.4954790; 

var distance = DistanceUtils.Dist2Degrees(radious, DistanceUtils.EARTH_MEAN_RADIUS_MI); 

var spatialArgs = new SpatialArgs(SpatialOperation.Intersects, ctx.MakeCircle(lng, lat, distance)); 
var spatialQuery = strategy.MakeQuery(spatialArgs); 
Point pt = ctx.MakePoint(lng, lat); 
ValueSource valueSource = strategy.MakeDistanceValueSource(pt); 


ValueSourceFilter vsf = new ValueSourceFilter(new QueryWrapperFilter(spatialQuery), valueSource, 0, distance); 
var filteredSpatial = new FilteredQuery(new MatchAllDocsQuery(), vsf); 
var spatialRankingQuery = new FunctionQuery(valueSource); 
BooleanQuery bq = new BooleanQuery(); 
bq.Add(filteredSpatial,Occur.MUST); 
bq.Add(spatialRankingQuery,Occur.MUST); 

TopDocs hits = indexSearcher.Search(bq, 10); 

我怎样才能从最近到远处的结果进行排序？

我使用：

• Lucene.Net 3.0.3

• Lucene.Net.Contrib.Spatial 3.0.3

• Spatial4n.Core 0.3

谢谢

Answer 1

这似乎是在Lucene.Net.Contrib.Spatial在MakeDistanceValueSource方法的错误，所以我写迈上了一个新DistanceValueSource类，它可以解决这个问题，叫DistanceReverseValueSource，你可以找到源类：

https://gist.github.com/aokour/088cd6484bce5e95ba83

这是我现在更新程式码：

string name = "__Location"; 
var strategy = new PointVectorStrategy(ctx, name); 

var indexSearcher = new IndexSearcher(_dir, true); 

double radious = Double.Parse(rad); 

double lat = 33.8886290; 
double lng = 35.4954790; 

var distance = DistanceUtils.Dist2Degrees(radious, DistanceUtils.EARTH_MEAN_RADIUS_MI); 

var spatialArgs = new SpatialArgs(SpatialOperation.Intersects, ctx.MakeCircle(lng, lat, distance)); 
var spatialQuery = strategy.MakeQuery(spatialArgs); 
Point pt = ctx.MakePoint(lng, lat); 
DistanceReverseValueSource valueSource = new DistanceReverseValueSource(strategy, pt, distance); 


ValueSourceFilter vsf = new ValueSourceFilter(new QueryWrapperFilter(spatialQuery), valueSource, 0, distance); 
var filteredSpatial = new FilteredQuery(new MatchAllDocsQuery(), vsf); 
var spatialRankingQuery = new FunctionQuery(valueSource); 
BooleanQuery bq = new BooleanQuery(); 
bq.Add(filteredSpatial,Occur.MUST); 
bq.Add(spatialRankingQuery,Occur.MUST); 

TopDocs hits = indexSearcher.Search(bq, 10); 

现在的结果是从最接近的排序，以farest！