[gdal-dev] GDAL_WMS/TMS with local CRS and bbox problem

[Andre Joost]

Am 15.01.2016 um 12:46 schrieb Stefan Keller:
> Hi
>
> I have a GDAL .vrt from a GDAL_WMS/TMS which was tweaked to
> projection/CRS EPSG:21781 [see below *].
>
> The problem here is, that the bbox is way too large. It should be
> Switzerland but it's larger than europe. (in 21781 it's lowerleftX
> 480000 loverleft Y 70000 upperrightX 840000 upperrightY 300000)
>
> How can I configure the correct bbox in the .vrt?
> Or is this a problem at server side config. (http://tile.osm.ch/21781/)?
> In fact I'm wondering anyhow about these current UpperLeftX/UpperLeftY
> numbers...(which somehow work)?
>
> :Stefan
>
>
> <GDAL_WMS>
>    <Service name="TMS">
>      <ServerUrl>http://tile.osm.ch/21781/${z}/${x}/${y}.png</ServerUrl>
>    </Service>
>    <DataWindow>
>      <UpperLeftX>-20037508.34</UpperLeftX>
>      <UpperLeftY>20037508.34</UpperLeftY>
>      <LowerRightX>20037508.34</LowerRightX>
>      <LowerRightY>-20037508.34</LowerRightY>

Those values are the worldwide bounds for EPSG:3857.

If you look at tile http://tile.osm.ch/21781/0/0/0.png, you see half of 
the world (without the americas). The bbox for Switzerland can be set 
smaller indeed.

HTH,
André Joost