[MapProxy] Provide Google-style tiles using a non global spherical mercator tile source

[Josh Doe]

On Fri, Mar 11, 2011 at 8:29 AM, Oliver Tonnhofer <olt at omniscale.de> wrote:
>
> On 11.03.2011, at 14:06, Josh Doe wrote:
>> Hi Oliver,
>> Thanks for the quick response. I've edited my config to try that out,
>> but it doesn't seem to be working; no matter how much I look at it I
>> can't seem to find what's wrong with it. I've put the config file on
>> the OSM wiki [1] if you wouldn't mind taking a look at it.
>
> OSM? So you wan't to use it in JOSM? Then I would start with WMS, to make it a bit easier.

I want to use it in JOSM as well as Potlatch2, so plain old OSM-style
tiles would be best. But you're right, I need to make sure WMS works
first.

>
>> One other question: since the origin for the source is nw, when I set
>> the bbox for the grid the only critical corner is top-left, and the
>> bottom-right only has to include Virginia, right? I'm getting some
>> vertical displacement (100m) and want to rule that out as a source.
>
>
>  vbmp_grid:
>    srs: 'SR-ORG:6639'
>    tile_size: [512, 512]
>    res: [1058.33545000423, 423.334180001693, 211.667090000847, 105.833545000423, 52.9167725002117, 26.4583862501058, 12.7000254000508, 6.3500127000254, 3.1750063500127, 2.11667090000847, 1.27000254000508, 0.63500127000254, 0.31750063500127]
>    # since origin is nw, only min_x/max_y are critical,
>    # just ensure other corner is south-east of Virginia
>    bbox: [-37232800, -477758.7842, 697942.5282, 45581000]
>
> MapProxy calculates the grid always from sw, so you need to pass the complete BBOX here.

Luckily I found a multiple of the resolutions that worked (6*min_res),
but it appears that at least for the ArcGIS REST tile interface, there
is no requirement for the resolutions to have a common multiple. I
would suggest that "origin: nw" be allowed in the grids section to
signify which corner to calculate the grid from. This would save
others from figuring out the least common multiple of the resolutions,
and then calculating the other corner of the bounding box, which is
highly prone to errors as I can attest.

Thanks,
-Josh

>
> Regards,
> Oliver
>
> --
> Oliver Tonnhofer    | Omniscale GmbH & Co KG    | http://omniscale.de
> http://mapproxy.org | https://bitbucket.org/olt
>
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