[postgis-users] ST_CreateOverview doesn't honor tilesize

[Senshi]

Thanks, seems it's a long standing issue that sadly nobody has tackled yet.

It seems ST_CreateOverview has even more issues, such as occasionally
generating empty pixel rows/columns at tile edges.

I uploaded an example of this issue for better understanding:
http://imgur.com/a/izlZX

I really would have loved to use PostGIS as a low level  WMTS server, but
these issues are making it difficult :( .

best regards
Senshi

On Wed, Aug 30, 2017 at 8:45 PM, Mateusz Loskot <mateusz at loskot.net> wrote:

> On 30 August 2017 at 14:52, Senshi <tassilo.m at gmail.com> wrote:
> > Hello,
> >
> >
> > when creating an overview, the tilesize of the original tiles is not
> fully
> > respected.
> >
> > If you have a 2x2 grid of tiles with 256x256 pixels each, and then
> create an
> > overview with a scale of 3,  the resulting single tile will end up as 171
> > pixels wide/tall.
>
> Overview with factor = 3 are 'special'.
>  Have a look at discussion here
> https://trac.osgeo.org/postgis/ticket/1764
>
> Best regards,
> --
> Mateusz Loskot, http://mateusz.loskot.net
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> postgis-users at lists.osgeo.org
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