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From "Mattmann, Chris A (388J)" <>
Subject Re: [spatial] Cartesian "Tiers" nomenclature
Date Tue, 29 Dec 2009 06:22:37 GMT
Hi Patrick,

Interesting. It seems like there is a precedent already in the Local Lucene
and Local SOLR packages that define "CartesianTier" as lingua franca.

Like I said in an earlier email it depends on who you talk to regarding the
preference of what to call these Tiles/Grids/Tiers, etc., and that seems to
be further evidenced by your research.

I for one donĀ¹t really have a preference but precedent matters to me and if
Tiers have been used to date then there should be strong consideration to
use that nomenclature and +1 from me.


On 12/28/09 9:25 PM, "patrick o'leary" <> wrote:

> So trying no to drag this out, the most frequent generic term used in GIS
> software is 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 <> 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 <>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 <
>>>> 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).

Chris Mattmann, Ph.D.
Senior Computer Scientist
NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
Office: 171-266B, Mailstop: 171-246
Adjunct Assistant Professor, Computer Science Department
University of Southern California, Los Angeles, CA 90089 USA

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