[MapProxy] Fixing or working around #583 (export using the existing image format of a source cache)?

[Johannes Kröger (WhereGroup)]

Hello again!

As we currently don't have the capacity to tackle it on our own, we are 
interested in financially sponsoring bugfixing this issue. Any 
developers interested? :))

PS: Seeding worked well as a *temporary* workaround, I documented that 
in the issue itself so other can use that way as well.

Cheers, Hannes

Am 22.06.22 um 10:19 schrieb Johannes Kröger (WhereGroup):
> Hi there!
>
> I recently discovered a bug with mapproxy-util export, where it would 
> export tiles in the wrong format (PNG instead of JPEG): 
> https://github.com/mapproxy/mapproxy/issues/583
>
> Basically it seems that when there is a cache B, using another cache A 
> as its source with the same grid, an export with mapproxy-util will 
> ignore the image format defined for the cache B but instead blindly 
> use the tiles from cache A.
>
> There are some prior reports of similar issues, marked fixed already:
> https://github.com/mapproxy/mapproxy/issues/94
> https://github.com/mapproxy/mapproxy/issues/52
>
> I might potentially get some capacity to look into this but would be 
> fairly lost at first. Does someone have any pointers where one could 
> start looking or how to most easily understand the concepts and code 
> paths around this?
>
> Alternatively, maybe there are some hacky workarounds. I wonder if I 
> could specify another grid that is for all intents and purposes 
> identical, not not identical to MapProxy, so that it would not lead to 
> this issue? :> Another idea would be using seeding to a file instead 
> of export but I'd like to avoid that approach for now (mostly because 
> I am not sure if the issue would not happen there as well).
>
> Cheers, Hannes
>
-- 
Johannes Kröger / GIS-Entwickler/-Berater

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