Github user dsmiley commented on a diff in the pull request:

    https://github.com/apache/lucene-solr/pull/246#discussion_r138331920
  
    --- Diff: 
lucene/spatial-extras/src/java/org/apache/lucene/spatial/spatial4j/Geo3dShapeFactory.java
 ---
    @@ -125,7 +125,12 @@ public Point pointXY(double x, double y) {
     
       @Override
       public Point pointXYZ(double x, double y, double z) {
    --- End diff --
    
    x,y,z here is horizontal (longitude), vertical (latitude), and some 
user-defined value.  It's not geo-centric coordinates as is found commonly in 
Geo3d.  This method is called by the WKT parser (and perhaps GeoJSON?) if the 
input format has a 3rd dimension to it.


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