[postgis-devel] ST_GetValues()

[Paul Ramsey]

> On Apr 16, 2021, at 1:54 AM, Sandro Santilli <strk at kbt.io> wrote:
> 
> On Fri, Apr 16, 2021 at 01:08:44AM -0400, Regina Obe wrote:
>>> Sent: Friday, April 16, 2021 1:03 AM
>>> To: 'PostGIS Development Discussion' <postgis-devel at lists.osgeo.org>
>>> Subject: RE: [postgis-devel] ST_GetValues()
>>> 
>>>> And building on that, ST_GetValues() which reads values from a raster
>>>> into the Z or M coordinates of a reference geometry.
> 
> [..]
> 
>> How about just overloading the name ST_Force3DZ, ST_Force3DM cause that's
>> essentially what you are doing here isn't it?

No, no more overloading, that just makes things less clear.

> How about ST_PopulateZ and ST_PopulateM ?

I had originally thought something like that. I'm fine w/ those. I think I had ST_CopyZ / ST_CopyM in my notes.

> Or even ST_SetZ and ST_SetM.

Not feeling these ones.

> For the latter we also have an open ticket requesting to extend
> the functionality of ST_SetZ/ST_SetM to allow getting the Z/M values
> from some other computation. In this case the computation would be
> extracting the value from a Raster, if I Understand correctly.
> 
> Or .. don't we have functions that "draw" a raster into a
> "vector/geometry canvas" ? In that case we could have them
> accept a non-empty canvas, to "draw into a pre-existing geometry",
> with some draw operation (multiply/add/replace/subtract..).
> I've some resemblance of implementing that kind of "drawing"
> in the CHIP type times...
> 
> --strk;
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