Detailed st_mapalgebra reference?

[Robert Burgholzer]

Thanks Scott!


On Tue, Jul 30, 2024 at 3:09 PM Scott <public at postholer.com> wrote:

> st_mapalgebra has to variants, expression and callback.
>
> With the callback version you can specify a user created pgsql function
> that can use any math function available in Postgres. It's far more
> flexible than the expression.
>
> Callback version:
> https://postgis.net/docs/RT_ST_MapAlgebra.html
>
> On 7/30/24 11:09, Robert Burgholzer wrote:
> > We are doing a ton of precip raster analysis and rectification, and we
> > are struggling to find details on the algebraic expressions that we can
> > use, ie, "[rast1] + [rast2]" is great if we are adding, but we are also
> > interested in boolean calculations etc.
> >
> > The basic postgis reference page is great for understanding syntax but I
> > am looking for recipes or a large raster calculator reference.
> >
> > Thanks on advance,
> > Robert
> >
> > --
> > Robert W. Burgholzer
> >   'Making the simple complicated is commonplace; making the complicated
> > simple, awesomely simple, that's creativity.'  - Charles Mingus
>
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