Geo3D uses more "straightforward" math since it can do everything on a unit (well, slightly squashed) sphere, but the downside is it must store 3 floats in the doc values.
Whereas LatLonPoint must use Haversine, supposedly more costly, except Lucene has a rather optimized implementation, and in practice seems to be faster than the 3D math: see our nightly geo benchmarks at http://home.apache.org/~mikemccand/geobench.html That said, having competing choices in open source is very healthy. E.g. we have multiple highlighter implementations, multiple query parsers, etc. Mike McCandless http://blog.mikemccandless.com On Thu, Aug 25, 2016 at 12:09 AM, Janaka Thilakarathna < bjchathura...@gmail.com> wrote: > Hi Michael, > > I am kinda confused about the difference between LatLon and Geo3D points. > Since, Geo3D does not in fact search 3 dimensions, what is the use of it > over LatLonPoint. Why there are two Fields as LatLon and Geo3D if both do > the Planet Surface search ? > > Regards, > Janaka > > On Mon, Aug 22, 2016 at 3:19 PM, Michael McCandless < > luc...@mikemccandless.com> wrote: > >> Hi Janaka, >> >> Unfortunately, Geo3D does not in fact search three dimensions: it only >> handles the same 2D earth surface as lat/lon. It's just that, internally, >> it's using three x,y,z coordinates to do all its math. But those three >> coordinates must be on the earth's surface for the math to be correct. We >> have wanted to rename this package so it's not so confusing, but have not >> yet succeeded. I believe the x,y,z are in the "unit sphere" coordinate >> space. >> >> Mike McCandless >> >> http://blog.mikemccandless.com >> >> On Mon, Aug 22, 2016 at 2:13 AM, Janaka Thilakarathna < >> bjchathura...@gmail.com> wrote: >> >>> Hi Michael, >>> >>> I started playing with Lucene LatLon and Geo3D points. I have a problem >>> about the constructor of Geo3DPoint. >>> >>> In the other constructor, Geo3DPoint(String name, double x, double y, >>> double z) >>> <https://lucene.apache.org/core/6_1_0/spatial3d/org/apache/lucene/spatial3d/Geo3DPoint.html#Geo3DPoint-java.lang.String-double-double-double->. >>> How can I map*,* Lat, Lon and Altitude into x,y,z. If we use x,y,z >>> there should be an Axis system. For an example I have these questions, >>> >>> - Where those axises are pointed to? >>> - What are the units (km or m)? >>> >>> If you can give me an idea on that it will be really helpful. :-) >>> Thank you. >>> >>> Regards, >>> >>> Janaka. >>> >>> On Thu, Aug 18, 2016 at 9:55 AM, Janaka Thilakarathna < >>> bjchathura...@gmail.com> wrote: >>> >>>> Hi Michael, >>>> >>>> Sorry for the late reply and thank you very much for your quick >>>> respond. :-) >>>> >>>> Yeah, it looks like an interesting data set to play with, but it is >>>> really large to start. :D >>>> I will try some simple projects and get back to you if I find any >>>> trouble. >>>> >>>> Janaka. >>>> >>>> On Tue, Aug 16, 2016 at 2:49 PM, Michael McCandless < >>>> luc...@mikemccandless.com> wrote: >>>> >>>>> What a fun use case for dimensional points! I just saw NASA announce >>>>> this data set recently: https://plus.google. >>>>> com/+MichaelMcCandless/posts/h8eUtkhizKG >>>>> >>>>> And I was wondering how to play with it... 36 TB of airplane flight >>>>> routes :) >>>>> >>>>> You can easily index your data (3 spatial dims + 1 time dim) using >>>>> e.g. DoublePoint but then the only way to query those points currently is >>>>> the PointRangeQuery (4D boxes); maybe you can use that to find the >>>>> "interesting area" traversals? >>>>> >>>>> For "minimum distance between two air-planes", you might be able to >>>>> start with LatLonPoint.nearest (KNN search implementation) but generalize >>>>> it a bit to N dims not just the 2 (lat, lon) that it supports today? >>>>> >>>>> Mike McCandless >>>>> >>>>> http://blog.mikemccandless.com >>>>> >>>>> On Tue, Aug 16, 2016 at 4:29 AM, Janaka Thilakarathna < >>>>> bjchathura...@gmail.com> wrote: >>>>> >>>>>> Hi everyone, >>>>>> >>>>>> I am from University of Moratuwa. I have a quite understanding in >>>>>> Lucene's >>>>>> Text Search, Geo3DPoint >>>>>> <https://lucene.apache.org/core/6_0_0/spatial3d/org/apache/l >>>>>> ucene/spatial3d/Geo3DPoint.html#newShapeQuery-java.lang.Stri >>>>>> ng-org.apache.lucene.spatial3d.geom.GeoShape->, >>>>>> LatLonPoint >>>>>> <https://lucene.apache.org/core/6_0_0/sandbox/org/apache/luc >>>>>> ene/document/LatLonPoint.html#newPolygonQuery-java.lang.Stri >>>>>> ng-double:A-double:A-> >>>>>> but I have never used Lucene for multi dimentional space search. >>>>>> >>>>>> The idea is to use multi dimensional space search on 4 dimensional >>>>>> space(3 >>>>>> physical dimensions and time as another dimension) to calculate >>>>>> results for >>>>>> following queries. >>>>>> >>>>>> - minimum distance between two air-planes >>>>>> - whether air planes goes through and interesting area. (For a >>>>>> example: >>>>>> A forbidden air space) >>>>>> >>>>>> Paths of air-planes can be represented by arrays of 4D points. >>>>>> (time,x,y,z). In other words I have different x,y,z coordinates for >>>>>> different time values. My idea is to index these points and query for >>>>>> above >>>>>> results. >>>>>> >>>>>> Since there is no much tutorials on this new feature on Lucene 6, I am >>>>>> quite confused where to start the project. I am really glad if >>>>>> someone can >>>>>> help me with this. >>>>>> >>>>>> I just want to know whether I can use Lucene for this use-case. >>>>>> Further if >>>>>> you can point me out a place to start developing, it will be really >>>>>> help >>>>>> full. >>>>>> >>>>>> Thank you! >>>>>> >>>>>> Regards >>>>>> >>>>>> -- >>>>>> *Janaka Chathuranga Thilakarathna* >>>>>> Undergraduate at Computer Science and Engineering Department, >>>>>> UNIVERSITY OF Moratuwa, Sri Lanka*.* >>>>>> >>>>>> mobile :(+94)* 713315725 **| *email : *janaka...@cse.mrt.ac.lk* >>>>>> <janaka...@cse.mrt.ac.lk>*, bjchathura...@gmail.com >>>>>> <bjchathura...@gmail.com>* >>>>>> skype : *janaka.chathurangat* | website : janakact.wordpress.com >>>>>> >>>>>> my public profiles : [image: Facebook] >>>>>> <http://www.facebook.com/bjchathuranga> [image: LinkedIn] >>>>>> <http://lk.linkedin.com/pub/janaka-chathuranga-thilakarathna >>>>>> /78/2a8/807/> >>>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> *Janaka Chathuranga Thilakarathna* >>>> Undergraduate at Computer Science and Engineering Department, >>>> UNIVERSITY OF Moratuwa, Sri Lanka*.* >>>> >>>> mobile :(+94)* 713315725 **| *email : *janaka...@cse.mrt.ac.lk* >>>> <janaka...@cse.mrt.ac.lk>*, bjchathura...@gmail.com >>>> <bjchathura...@gmail.com>* >>>> skype : *janaka.chathurangat* | website : janakact.wordpress.com >>>> >>>> my public profiles : [image: Facebook] >>>> <http://www.facebook.com/bjchathuranga> [image: LinkedIn] >>>> <http://lk.linkedin.com/pub/janaka-chathuranga-thilakarathna/78/2a8/807/> >>>> >>> >>> >>> >>> -- >>> *Janaka Chathuranga Thilakarathna* >>> Undergraduate at Computer Science and Engineering Department, >>> UNIVERSITY OF Moratuwa, Sri Lanka*.* >>> >>> mobile :(+94)* 713315725 **| *email : *janaka...@cse.mrt.ac.lk* >>> <janaka...@cse.mrt.ac.lk>*, bjchathura...@gmail.com >>> <bjchathura...@gmail.com>* >>> skype : *janaka.chathurangat* | website : janakact.wordpress.com >>> >>> my public profiles : [image: Facebook] >>> <http://www.facebook.com/bjchathuranga> [image: LinkedIn] >>> <http://lk.linkedin.com/pub/janaka-chathuranga-thilakarathna/78/2a8/807/> >>> >> >> > > > -- > *Janaka Chathuranga Thilakarathna* > Undergraduate at Computer Science and Engineering Department, > UNIVERSITY OF Moratuwa, Sri Lanka*.* > > mobile :(+94)* 713315725 **| *email : *janaka...@cse.mrt.ac.lk* > <janaka...@cse.mrt.ac.lk>*, bjchathura...@gmail.com > <bjchathura...@gmail.com>* > skype : *janaka.chathurangat* | website : janakact.wordpress.com > > my public profiles : [image: Facebook] > <http://www.facebook.com/bjchathuranga> [image: LinkedIn] > <http://lk.linkedin.com/pub/janaka-chathuranga-thilakarathna/78/2a8/807/> >
