mapscript querybypoint未返回任何结果

我有一个使用C mapscript动态生成的映射文件,定义如下:

MAP
  EXTENT 5.91828 45.63552 5.92346 45.65051
  IMAGECOLOR 192 192 192
  IMAGETYPE png
  SIZE 256 256
  STATUS ON
  TRANSPARENT TRUE
  UNITS METERS
  NAME "GMAP_TILE"

  OUTPUTFORMAT
    NAME "png"
    MIMETYPE "image/png"
    DRIVER "GD/PNG"
    EXTENSION "png"
    IMAGEMODE "PC256"
    TRANSPARENT TRUE
  END

  SYMBOL
    NAME "circle"
    TYPE ELLIPSE
    FILLED TRUE
    POINTS
      1 1
    END
  END

  SYMBOL
    NAME ">"
    TYPE TRUETYPE
    ANTIALIAS TRUE
    CHARACTER ">"
    GAP -20
    FONT "arial"
    POSITION CC
  END

  PROJECTION
    "proj=merc"
    "a=6378137"
    "b=6378137"
    "lat_ts=0.0"
    "lon_0=0.0"
    "x_0=0.0"
    "y_0=0"
    "units=m"
    "k=1.0"
    "nadgrids=@null"
  END
  LEGEND
    IMAGECOLOR 255 255 255
    KEYSIZE 20 10
    KEYSPACING 5 5
    LABEL
      SIZE MEDIUM
      TYPE BITMAP
      BUFFER 0
      COLOR 0 0 0
      FORCE FALSE
      MINDISTANCE -1
      MINFEATURESIZE -1
      OFFSET 0 0
      PARTIALS TRUE
    END
    POSITION LL
    STATUS OFF
  END

  QUERYMAP
    COLOR 255 255 0
    SIZE -1 -1
    STATUS ON
    STYLE HILITE
  END

  SCALEBAR
    ALIGN CENTER
    COLOR 0 0 0
    IMAGECOLOR 255 255 255
    INTERVALS 4
    LABEL
      SIZE MEDIUM
      TYPE BITMAP
      BUFFER 0
      COLOR 0 0 0
      FORCE FALSE
      MINDISTANCE -1
      MINFEATURESIZE -1
      OFFSET 0 0
      PARTIALS TRUE
    END
    POSITION LL
    SIZE 200 3
    STATUS OFF
    STYLE 0
    UNITS MILES
  END

  WEB
    IMAGEPATH ""
    IMAGEURL ""
    QUERYFORMAT text/html
    LEGENDFORMAT text/html
    BROWSEFORMAT text/html
  END

  LAYER
    NAME "Troncons"
    PROJECTION
      "proj=longlat"
      "ellps=WGS84"
      "datum=WGS84"
    END
    STATUS DEFAULT
    TEMPLATE "nofile.html"
    TOLERANCE 100
    TOLERANCEUNITS METERS
    TYPE LINE
    UNITS METERS
    CLASS
      NAME "Troncons"
      STYLE
        ANGLE 360
        COLOR 0 0 255
        SIZE 5
        SYMBOL "circle"
        WIDTH 5
      END
      STYLE
        ANGLE 360
        COLOR 0 0 0
        SIZE 12
        SYMBOL ">"
        WIDTH 1
      END
    END
    FEATURE
      POINTS
        5.91828 45.63552
        5.91876 45.63611
        5.91898 45.6364
        5.91936 45.63701
        5.91952 45.63731
        5.91968 45.63762
        5.91993 45.63825
        5.92003 45.63856
        5.92018 45.63919
        5.92028 45.63983
        5.92031 45.64014
        5.92033 45.64046
        5.92034 45.64077
        5.92034 45.64108
        5.92034 45.64171
        5.92035 45.64234
        5.92035 45.6428
        5.92037 45.6433
        5.9204 45.64394
        5.92046 45.64458
        5.92056 45.64522
        5.92062 45.64554
        5.92069 45.64586
        5.92077 45.64617
        5.92097 45.64679
        5.92122 45.64739
        5.92136 45.64769
        5.92169 45.64828
        5.92207 45.64886
        5.92228 45.64914
        5.92272 45.64969
        5.92321 45.65023
        5.92346 45.65051
      END
    END
  END
END

我试图通过查询bypoint来检索clciked附近形状的索引。在下面的代码中,我做了一个具有固定点的特定测试函数,而不是通过参数传递的点,因此我确信我使用的点实际上是一个特性的一部分。在我的例子中,我使用mapfile中包含的唯一特性的第一点。

public string GetTronconId()
    {
        //_map is my dynamically created mapObj
        if (_map != null)
            for (int i = 0; i < _map.numlayers; i++)
            {
                layerObj layer = _map.getLayer(i);
                // Code never pass this point
                if (layer.queryByPoint(_map, new pointObj(5.91898, 45.6364, 0, 0), (int) MS_QUERY_MODE.MS_QUERY_MULTIPLE, 100) == (int) MS_RETURN_VALUE.MS_SUCCESS)
                {
                    int numresults = layer.getNumResults();
                    if (numresults != 0)
                    {
                        layer.open();
                        for (int j = 0; j < numresults; j++)
                        {
                            resultCacheMemberObj resultat = layer.getResult(j);
                            shapeObj shape = null;
                            if (layer.getShape(shape, resultat.tileindex, resultat.shapeindex) == (int) MS_RETURN_VALUE.MS_SUCCESS)
                                return shape.getValue(0);
                        }
                    }
                }
            }

        return null;
    }

我有一个虚拟模板集,我不需要使用公差,因为点是直接在一个形状,但QueryByPoint不断返回我的MS_失败。从我在网上的搜索来看,一切似乎都很好。有什么想法吗?