[MapProxy] Problems with TMS and grid _skip_first_level

[G. Allegri]

Thanks Olivier, I missed that singularity of the TMS spec, because
TileStache and Mapcache don't adhere strictly to it.

And I thought that the tiles service was working for cached tiles, not for
"live caching".
Maybe it would be useful to have a specific paragraph for this service with
a reference to the "XYZ" tile format (as OL and many others call it).

Cheers,
Giovanni

Il 20 giu 2017 08:26, "Oliver Tonnhofer" <olt at omniscale.de> ha scritto:

> Hi,
>
> the TMS spec comes with its own definition of a mercator tile grid and
> this starts with four tiles in zoom level 0.
>
> You need to use the /tile or /wmts endpoint. Please read
> https://mapproxy.org/docs/nightly/services.html#tiled-map-services-tms
> for more information
>
> Regards,
> Oliver
>
> --
> Oliver Tonnhofer  | Omniscale GmbH & Co KG  | https://omniscale.com
> OpenStreetMap WMS and tile services         | https://maps.omniscale.com
>
>
>
>
>
> > On 14.06.2017, at 09:46, G. Allegri <giohappy at gmail.com> wrote:
> >
> > Hi,
> > I'm using OL 3/4 for an application where a TMS layer is defined:
> >
> > new ol.layer.Tile({
> >    source: new ol.source.XYZ({
> >       url: "http://localhost:8080/tms/1.0.0/mylayer/webmercator/{z}/{
> x}/{-y}.png",
> >    })
> > })
> >
> > (the inverted "y" in a XYZ layer makes it behave as a TMS layer).
> >
> > The map is EPSG:3857 and the layer source (WMS service) is also EPSG:3857
> >
> > This OL app works perfectly with other cache tools, like mapcache, with
> a standard mercator grid.
> > When I use it with MapProxy things get wrong becasue TileServiceGrid
> skips the first level for GLOBAL_(WEB)MERCATOR :
> https://github.com/mapproxy/mapproxy/blob/master/mapproxy/
> service/tile.py#L381
> >
> > If self._skip_first_level is forced to False everything goes fine.
> >
> > I noticed that even in you OpenLayers 2 Demo you start resolutions from
> 78271.516964, which is the second level of the the classical mercator grid.
> >
> > My questions are:
> >
> >  - why is the first level skipped?
> >  - how could I define a GLOBAL_WEBMERCATOR grid without skipping the
> first level? I don't want to force it at level of (internal) code,
> obviusoly.
> >
> > Thanks so much,
> > Giovanni
> >
> > _______________________________________________
> > MapProxy mailing list
> > MapProxy at lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/mapproxy
>
>
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