postgis - Database that supports three-dimensional spatial indexing -


i have set of 10 million documents tagged geolocation , time, growing @ rate of 100,000 per day. need way query documents nearby given latitude/longitude, want take time account (more recent documents should more highly weighted).

my current solution takes 300 ms run query , struggling under increased load, trying figure out better way it. made prototype using 3-dimensional kd-tree (on latitude, longitude, , time), , insanely fast (<1 ms). however, not @ suitable production -- required loading whole thing in memory, , more importantly there doesn't seem way write to/delete kd-tree. i'm looking production-ready database offers approaching kind of speed, supports normal insert , update operations.

i looked postgis, says supports 2-4 dimensional spatial fields. however, couldn't find conclusive information on whether or not supports >2 dimensional spatial indices. know if support 3d index, , if seem relatively performant? if not, other options out there?

thanks in advance.

after bit of googling, found this page has useful information on n-d indexing in postgis. looks postgis way go problem; i'll try build prototype tomorrow.


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