[postgis-users] ST_CreateOverview doesn't honor tilesize
tassilo.m at gmail.com
Thu Aug 31 00:34:54 PDT 2017
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:
I really would have loved to use PostGIS as a low level WMTS server, but
these issues are making it difficult :( .
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
> > 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
> Best regards,
> Mateusz Loskot, http://mateusz.loskot.net
> postgis-users mailing list
> postgis-users at lists.osgeo.org
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