| Re: [geomesa-users] Spatial index optimization |
Hi José,
If you're indexing points, then the XZ index will not be used - it's only for geometries with extents (line strings, polygons, etc).
That said, I'm not sure that anyone has played around much with the resolution level. We picked a default value that seemed to work well with various data sets in our testing, but left it exposed as a configuration option in case people wanted to change it.
It's pretty mathy, but the resolution is the 'g' variable in the XZ algorithm: http://www.dbs.ifi.lmu.de/Publikationen/Papers/SSD-XZ- Order.final.pdf
It is essentially the level of recursion we use when splitting up the grid.
Thanks,
Emilio
On 03/15/2017 06:25 PM, Jose Bujalance wrote:
Hi,
I have a Geomesa store with 80 million elements containing both spatial and temporary fields. I did the ingestion into Geomesa with the default values, but I have recently learnt that it is possible to optimize the index depending on the resolution we want.
I understand how to configure the temporary index, choosing between day, week, month or year intervals. However, I don´t fully understand how to choose the resolution level for the ZX index. In my case, all my points are located in France, so I guess I don't need a large precision.
What precision level would you recommend for this case (80 million points in France) ?
Thanks for your time,
José.
_______________________________________________ geomesa-users mailing list geomesa-users@xxxxxxxxxxxxxxxx To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.locationtech.org/ mailman/listinfo/geomesa-users
_______________________________________________
geomesa-users mailing list
geomesa-users@xxxxxxxxxxxxxxxx
To change your delivery options, retrieve your password, or unsubscribe from this list, visit
https://dev.locationtech.org/mailman/listinfo/geomesa-users