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From Grant Ingersoll <>
Subject Re: [spatial] Cartesian "Tiers" nomenclature
Date Mon, 28 Dec 2009 22:56:23 GMT

On Dec 28, 2009, at 4:19 PM, patrick o'leary wrote:

> Hmm, but when you say grid, to me that's just a bunch of regularly spaced
> lines..

Yeah, I hear you.  I chose spatial tiles for the Solr patch, but spatial grid would work too.
 Or map tiles/map grids.  That anchors it into the spatial world, since we're calling Lucene's
spatial contrib/spatial and Solr's Solr Spatial.

> On Mon, Dec 28, 2009 at 1:16 PM, Grant Ingersoll <>wrote:
>> On Dec 28, 2009, at 3:51 PM, patrick o'leary wrote:
>>> So Grant here's the deal behind the name.
>>> Cartesian because it's a simple x.y coordinate system
>>> Tier because there are multiple tiers, levels of resolution.
>>> If you look at it closer:
>>> - To programmers there's a quadtree implementation
>>> - To web users who use maps these are grids / tiles.
>>> - To GIS experts this is a form of multi-resolution raster-ing.
>>> - To astrophysicists these are tiers.
>>> - To the MS folks I've talked to they have quad something or other.
>>> - To math folks Cartesian levels makes sense.
>>> Can't make all the people happy all the time,
>> Right, but as far as I can tell (and I've only done, say an hour of
>> research), I can't find anyone who calls them Cartesian Tiers other than us.
>> Personally, I think web users are the largest group (after all, aren't we
>> all web users?) out there and therefore will be the most familiar with
>> either grid or tile.  FWIW, I have tentatively called the Solr FieldType to
>> support this "SpatialTileField" as in it represents a tile in the spatial
>> sense.  I'd be fine with SpatialGridField as well (GridField seems a bit too
>> generic).

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