[postgis-users] Cut extent box2d into small regular boxes, and iterate through each box of features

[Shaozhong SHI]

Hi, Lars,

No explanation on content-balanced_grid can be found.  What is it based
on?  What does content mean in this context?  Why do so?

Regards,

David

On Mon, 28 Mar 2022 at 07:49, Lars Aksel Opsahl <Lars.Opsahl at nibio.no>
wrote:

>
>
> ------------------------------
> >From: postgis-users <postgis-users-bounces at lists.osgeo.org> on behalf of
> Mike Taves <mwtoews at gmail.com>Sent: Sunday, March 27, 2022 10:31 PMTo:
> PostGIS Users Discussion <postgis-users at lists.osgeo.org>Subject: Re:
> [postgis-users] Cut extent box2d into small regular boxes, and iterate
> through each box of features
> >
> >On Sat, 26 Mar 2022 at 02:44, Shaozhong SHI <shishaozhong at gmail.com>
> wrote:
> >> Is there a procedure to get a box2d for the extent of features?
> >> Divide the box into smaller regular boxes
> >> loop carry out geospatial operation in each box
> >
> >A few ideas to generate the small regular boxes, see:
> >- https://postgis.net/docs/ST_SquareGrid.html
> >- https://gis.stackexchange.com/q/16374/
> >
> Hi
>
> We use a lot of grids, but we have seen that using content to influence
> each grid cell size is more important than having regular sized grid cell.
> For instance, smaller cell's where it's high density of polygons and larger
> cell in other areas. When grid cells are "equal" related to content (and
> not spatial size) it also easier to run thing parallel without running into
> memory problems and so on.
>
> Here is some sample code https://github.com/larsop/content_balanced_grid
> to create grids and here some code where we use such a grid
> https://github.com/larsop/find-overlap-and-gap .
>
> Lars
>
>
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