[postgis-users] How can I divide up a region into a grid of rectangles?

[Simon Greener]

It that which Regina Obe described in her article on generate_series the sort
of thing you want to do?

http://www.bostongis.com/blog/index.php?/categories/13-generate_series

regards
Simon
On Fri, 11 Nov 2011 15:19:54 +1100, Roxanne Reid-Bennett <rox at tara-lu.com> wrote:

> On 11/10/2011 7:37 PM, MarkW wrote:
>> This is kind of a simplistic approach maybe - because a simple grid
>> doesn't have to intersect with municipal features. But could you
>> simply decide on a rounding level that would give you what you wanted?
>> Round the lat/lons to a certain decimal level, then count by / group
>> on  those rounded lat/lons? Each one could represent centroid or a
>> corner of a grid.
>>
>
> Giving a very simplistic overview... Our current application creates "a
> grid" by using
> ST_SnapToGrid to collapse multiple points to one "standard" point. It
> then uses a
> polygon drawn on a map to create a "boundary".  Given a list of points
> and a polygon, using
> point && polygon [with a gist index on each] for speed
> and ST_Intersects(point,polygon) for accuracy you can collect
> whatever points are "in" the boundary ...
>
> Given a pre-defined grid size...
>
> If you don't want to hassle with boundaries right now, you can artificially
> create all the grid points within your lat/lon range, assign them a
> neighborhood, then look for "identical"
> snapped to grid points in your data with a straight equality test for
> the join
> to collect a count "in" a neighborhood.
>
> Make sure you are working with the "right" (or at least same) SRIDs.
>
> Roxanne
>
>
>
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