[postgis-users] hexagonal grid

[Randall, Eric]

You are the Man, Stan!

Eric

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net]On Behalf Of
Sufficool, Stanley
Sent: Thursday, May 29, 2008 4:21 PM
To: PostGIS Users Discussion
Subject: RE: [postgis-users] hexagonal grid


Generate a hexagonal grid of 64x128 hexes, then follow the slice/dice from bostongis at step 4.

Substitute the values in generate series with your datasource min/max X/Y extents.

===============================

create table hex_grid (gid serial not null primary key, the_geom geometry not null);

INSERT INTO hex_grid (the_geom)
SELECT translate(the_geom, x_series, y_series)
from generate_series(0 - 128, 10000 + 128, 128) as x_series,
generate_series(0 - 128, 10000 + 128, 256) as y_series,
(
	SELECT 'POLYGON((0 0,64 64,64 128,0 192,-64 128,-64 64,0 0))'::geometry as the_geom
	UNION SELECT translate('POLYGON((0 0,64 64,64 128,0 192,-64 128,-64 64,0 0))'::geometry, 64, 128)  as the_geom
) as one_hex

===============================


-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Matias Massigoge
Sent: Thursday, May 29, 2008 12:58 PM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] hexagonal grid


Thanks Paul!!

On Thu, May 29, 2008 at 4:42 PM, Paul Ramsey <pramsey at cleverelephant.ca> wrote:
> Try this:
>
> http://www.bostongis.com/blog/index.php?/archives/35-Map-Dicing-and-ot
> her-stuff.html
>
> P.
>
> On Thu, May 29, 2008 at 12:34 PM, Matias Massigoge 
> <matias.massigoge at agerpro.com.ar> wrote:
>> Hi all,
>>
>> I'm looking for something similar but squared.
>> This theme have been covered in the past?
>> Sorry, I'm newby.
>> Thanks all.
>>
>> Matías
>>
>>
>>
>> On Thu, May 29, 2008 at 12:42 PM, Brent Wood <pcreso at pcreso.com> 
>> wrote:
>>>
>>>> On Thu, May 29, 2008 at 7:08 AM, Randall, Eric 
>>>> <ERandall at eriecountygov.org>
>>> wrote:
>>>> > Has anyone created a method for generating a hexagonal grid over 
>>>> > a polygon
>>>> envelope using postgis? Thought I'd ask before setting out.  
>>>> Thanks.
>>>
>>> Hi Eric
>>>
>>> I haven't specifically done this in PostGIS, but have briefly looked 
>>> into something similar with a colleague who uses R extensively, and 
>>> was looking at cellular automata modelling over a hexagonal grid. He 
>>> was using such a dataset in R, & there were a few ways this could be 
>>> transferred to PostGIS, including the R:gdal package, or a 
>>> dump/parse/reformat/import script.
>>>
>>> Cheers,
>>>
>>>   Brent Wood _______________________________________________
>>> postgis-users mailing list
>>> postgis-users at postgis.refractions.net
>>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>>
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