[MapProxy] Translating Proj4Leaflet config to Grids yaml

[Daniel Cheng (SDiZ)]

Hi Oliver,

Thank You!

Regards,
Daniel

On Thu, Sep 10, 2015 at 9:33 PM, Oliver Tonnhofer <olt at omniscale.de> wrote:

> Hi,
>
>
> On 10.09.2015, at 13:47, Daniel Cheng (SDiZ) <sdiz at sdiz.net> wrote:
> > grids:
> >     epsg2326:
> >         srs: EPSG:2326
> >         res: [ 42.33341800016934, 21.16670900008467, 10.583354500042335,
> 5.291677250021167, 2.6458386250105836, 1.3229193125052918,
> 0.6614596562526459, 0.33072982812632296, 0.16536491406316148 ]
> >         origin: nw
> >         bbox_srs: EPSG:4326
> >         bbox: [ 129.71179031844, -89.996752339456, -129.71179031844,
> 89.996752339456 ]
>
>
> The tile grids need to match "pixel perfect", otherwise you will get
> unexpected results. You should define the bbox in the same projection with
> the same origin values.
>
>
> When Proj4Leaflet expects the origin north/west, then the bbox of the
> first tile should look like:
> [-4786700, 8353100-42.33341800016934*256, -4786700+42.33341800016934*256,
> 8353100]
> Assuming that Proj4Leaflet calculates the tile grid with a single tile in
> the first zoom level.
>
> In MapProxy it should look like:
>
>     epsg2326:
>         srs: EPSG:2326
>         res: [ 42.33341800016934, 21.16670900008467, 10.583354500042335,
> 5.291677250021167, 2.6458386250105836, 1.3229193125052918,
> 0.6614596562526459, 0.33072982812632296, 0.16536491406316148 ]
>         origin: nw
>         bbox: [-4786700, 8342262.644991957, -4775862.644991957, 8353100]
>
> (Untested, but you get the idea)
>
>
> Regards,
> Oliver
>
> --
> Oliver Tonnhofer  | Omniscale GmbH & Co KG  | http://omniscale.com
> OpenStreetMap WMS and tile services         | http://maps.omniscale.com
>
>
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