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

[Even Rouault]

Le vendredi 15 janvier 2016 12:46:33, Stefan Keller a écrit :
> 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)?

You have to figure out/find somewhere what is the extent at zoom level 0 in 
EPSG:21781 (thus representing a large part of the world) and put it in the 
GDAL_WMS definition.

Then you can create a view on Switzerland with gdal_translate -srcwin -of VRT.

> 
> :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>
>     <TileLevel>18</TileLevel>
>     <TileCountX>1</TileCountX>
>     <TileCountY>1</TileCountY>
>     <YOrigin>top</YOrigin>
>   </DataWindow>
>   <Projection>EPSG:21781</Projection>
>   <BlockSizeX>256</BlockSizeX>
>   <BlockSizeY>256</BlockSizeY>
>   <BandsCount>3</BandsCount>
>   <Cache />
> </GDAL_WMS>
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