Hi Jim, I have a tree which level0 are vertices, level 1 are edges, level2 are polygons, etc, Elements on level 0 are only connected to elements in level 1, level 1 to 2 (i.e., the graph relationships).
1- In this case, shall I add only vertices (with coordinates) to the spatial index or add all objects in level 1, level 2, etc too? later I have query like subsetting, i.e., having a bounding box I want to see for instance all polygons inside it, etc. 2- Do I need to build other type of neo4j indexes i.e., non spatial indexes? Thanks, Best, Alireza On Friday, July 18, 2014 3:25:15 PM UTC+2, Jim Biard wrote: > > Alireza, > > These questions are so broad that it's hard to answer. > > If you want to be able to get all of your different nodes back from a > single query, then they must all be in the same RTree layer (accessed > through a spatial index in Cypher). If different kinds or subsets of > spatial nodes are to be queried separately, then you need a different layer > (and thus different spatial index for Cypher-based queries) for each > separate type or subset. It also depends on the type of geometry you are > using. There are three types of geometries - WKB, WKT, and simple point, > and you cannot mix these within a layer. > > As for "normal" indexes, it all depends on what you are trying to do. I > can't answer this question, except to say that indexing (some of which is > done transparently if you are using labels) will generally increase > performance. > > Grace and peace, > > Jim > > On Friday, July 18, 2014 4:04:32 AM UTC-4, Alireza Rezaei Mahdiraji wrote: >> >> >> Hi All, >> >> Assuming a graph which has 3 to four kind of spatial nodes (e.g., point, >> line, polygon), how many and what type of >> spatial indexes I should build on this graph? How about normal indexes? >> Do I need them too? >> Is there any general guideline on indexing w.r.t. performance? >> >> >> Best, >> Alireza >> >> >> >> >> -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to neo4j+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
