[MapProxy] EPSG:4326 grid not compatible with WMTS?

[John Bryant]

Hi, I'm having trouble with my MapProxy configuration and wondering if
anyone has any sage advice. I'm pretty new to MapProxy so please forgive my
newbness.

My config YAML file defines a WMS and a WMTS service. I've defined 2 grids,
based on EPSG:900913 and 4326. The second grid was implemented because
otherwise, requests including the south pole (-90S) caused a python error.

However, now that I've put this grid in, MapProxy gives a warning, for
every single layer, every time it's called, like this:

WARNING - mapproxy.service.wmts - skipping layer 'layer18_250k.ecw' for
WMTS, grid 'WGS84' of cache 'cacheA' is not compatible with WMTS

These warnings are coming through by the thousand and making for some very
unreadable logs. Also I'm concerned that it may be impacting performance...

I've tried modifying the grid definition a dozen different ways, what it
seems to keep coming back to is that the grid defined on GLOBAL_GEODETIC
doesn't quite work.

The relevant bits of the config file are here:

services:
  wms:
    srs: ['EPSG:4326', 'EPSG:900913']
  wmts:

grids:
  GOOG_900913:
    base: GLOBAL_MERCATOR
  WGS84:
    base: GLOBAL_GEODETIC
    srs: 'EPSG:4326'
    bbox: [-180,-90,180,90]
    bbox_srs: 'EPSG:4326'
    origin: sw


Am I missing something?

Thanks
John
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