[postgis-tickets] [PostGIS] #3133: ND-Distance function for KNN <<->> support

[PostGIS]

#3133: ND-Distance function for KNN <<->> support
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 Reporter:  pramsey      |      Owner:  pramsey
     Type:  enhancement  |     Status:  new
 Priority:  critical     |  Milestone:  PostGIS 2.2.0
Component:  postgis      |    Version:  trunk
 Keywords:               |
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 To allow <<->> to also partake in exact KNN support, a distance function
 that can handle, 2d, 3d and 4d inputs is needed. It should to standard 3d
 distance and 3dz distance. For 3dm cases it should find the closest points
 in m space and add that distance to the total. Same for 3dzm cases, but
 using the 3dz closest point functionality.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/3133>
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