[postgis-devel] Geodetic Plan

[nicklas.aven at jordogskog.no]

Maybe this is what you mean with "multi-dimensional indexing" in geodetic-plan.txt ? /Nicklas

2009-06-19 nicklas.aven at jordogskog.no wrote:

Hallo > >I have a thought about indexing. Idon't know much about them but I have read some headings from the diskussions about deviding features to get more out of the geometries.> >I guess the issues about comparing big to small will be more common when handling "the whole world".>Wouldn't it be possible to just devide the index. > >The bounding-boxes would be just like the divided features bboxes but just be indexes.> >I think one example to discuss this from is a query asking for all towns close to the atlantic oscean. With a boundingbox to the atlantic the index will give us most of the towns in the world. > >The idea is to build the index like, lets say, for example one bounding box to the representation of the atlantic in each long/lat degree.>Then the index could fist scan all towns sharing "lat/long-degree boxes" with the atlantic from some static ID of the boxes, then select from them using the smaller boundingboxes to the atlantic. > >Or maybe it would be better to!
  divide the indexes in relation to the size of the object. I don't know> >I say like Regina:>Crazy thought so feel free to knock it down.
>>or maybe it's alreagy out there.
>> >/Nicklas> >
> 2009-06-18 Paul Ramsey wrote:
>
> Folks,
> >
> >I may be getting a contract to bring in geodetic support in the next
> >little while. The challenge is to bring in this potentially big piece
> >of new functionality, and have it into a released version in around 9
> >months. I have been thinking about different ways to approach the
> >implementation and placed some thoughts here.
> >
> >files.getdropbox.com/u/1184727/geodetic-plan.txt
> >
> >I'm interested to hear your thoughts about what the most useful
> >approach would be. The client wants to see this work in the core
> >distribution, and OpenGeo has an interest in the longer term vision of
> >PostGIS, so the most expedient approach is not necessarily required,
> >we can choose something that balances our long-term vision with the
> >short-term need to have working code in a numbered release.
> >
> >Yours,
> >
> >Paul
> >_______________________________________________
> >postgis-devel mailing list
> >postgis-devel at postgis.refractions.net
> >postgis.refractions.net/mailman/listinfo/postgis-devel
> >
> >
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