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Date: Mon, 28 Dec 2009 21:25:20 -0800
Message-ID: <1e33aedb0912282125k2f6dc673u98584f8ea24854c3@mail.gmail.com>
Subject: Re: [spatial] Cartesian "Tiers" nomenclature
From: "patrick o'leary" <pjaol@pjaol.com>
To: general@lucene.apache.org
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So trying no to drag this out, the most frequent generic term used in GIS
software is SRID
http://en.wikipedia.org/wiki/SRID

Again this provides just a basic nomenclature for the high level element,
somewhat the blackbird of objects rather than the defining the magpie (sorry
for the CS 101 reference)

But it should show that every implementation is unique in some format.
Perhaps as unique as CartesianTier's ( sorry Ted ! )


On Mon, Dec 28, 2009 at 5:26 PM, patrick o'leary <pjaol@pjaol.com> wrote:

> Hmm, depends, tiles indicate to me a direct correlation between the id and
> a map tile, which will depend upon using the right projection
> with the cartesian plotter
>
>
> On Mon, Dec 28, 2009 at 2:56 PM, Grant Ingersoll <gsingers@apache.org>wrote:
>
>>
>> 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 <gsingers@apache.org
>> >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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